Article
Chemistry, Multidisciplinary
Sophia L. Wandelt, Alexander Mutschke, Dmitry Khalyavin, Jennifer Steinadler, Wolfgang Schnick
Summary: Metal hydrides are a class of compounds that are used to create various functional materials. Neutron diffraction is necessary to study their structural characteristics due to the low scattering power of hydrogen for X-rays. In this study, a new strontium nitridoborate hydride, Sr-13[BN2](6)H-8, was synthesized and its crystal structure was determined using X-ray and neutron diffraction. The presence of anionic hydrogen within the structure was confirmed using MAS NMR and vibrational spectroscopy. Quantum chemical calculations supported the experimental findings. Sr-13[BN2](6)H-8 expands the family of nitridoborate hydrides and opens up possibilities for new and interesting materials.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Volodymyr A. Yartys, Colin J. Webb, Fermin Cuevas
Summary: The paper provides an overview of advanced in situ diffraction studies for probing the structure and reacting mechanisms of hydrogen and energy storage materials. These studies utilize high flux diffraction beam and high resolution measurements to establish the mechanism of phase-structural transformations and their kinetics. Various conditions, such as hydrogen/deuterium pressures and temperatures, as well as different charge-discharge states, are considered. The paper also highlights the contributions of Dr. Michel Latroche and summarises a long-standing collaboration between the co-authors in the field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Ryan A. Klein, Rafael Balderas-Xicohtencatl, Jan Petter Maehlen, Terrence J. Udovic, Craig M. Brown, Robert Delaplane, Yongqiang Cheng, Roman Denys, Anibal J. Ramirez-Cuesta, Volodymyr A. Yartys
Summary: Intermetallic metal hydrides are essential for hydrogen storage, but those with higher storage capacities are still needed. Neutron vibrational spectroscopy (NVS) was used to study LaNiInHx and CeNiInH1.4, revealing close vibrational features between paired H atoms when x > 0.67. In contrast, no close H contacts were found in CeNiSnH, CeNiSnH2, and CeNiSnD2, demonstrating differences in hydrogen dynamics between the compounds.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jing Wen, Laetitia Laversenne, Marc Novelli, Thierry Grosdidier, Patricia de Rango
Summary: Efficient, simple, and safe processes like room temperature forging are required for the development of hydrogen storage in metal hydrides. Samples made from Mg and Ni powders through this method show only Mg and Ni phases. Deuterium absorption occurs at temperatures as low as 250 degrees C due to basal fiber texture and structural defects induced by forging. Deuterium-induced mobility of metal atoms is evidenced by the absence of Mg and Ni reaction in the absence of deuterium even after annealing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Maxime Dottor, Jean-Claude Crivello, Laetitia Laversenne, Jean -Marc Joubert
Summary: The Hf-H(D) system was investigated using in situ neutron diffraction to understand its behavior under different compositions and temperatures. This study provided new insights into the phase existence and phase diagram of the system. Two major findings were the discovery of a new phase (gamma, PtS structure type) similar to the monohydride found in the H-Zr system, and the determination of the structure of the 6' phase, which is an ordered superstructure of the 6 phase (CaF2 structure type). Phase relations were established, and a new phase diagram was proposed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Crystallography
Andre Goetze, Siobhan Christina Stevenson, Thomas Christian Hansen, Holger Kohlmann
Summary: Binary intermetallic compounds, such as FePd3, have attracted attention due to their physical, magnetic, and catalytic properties. In this study, the hydrogenation properties of ordered FePd3 and disordered Fe0.25Pd0.75 were investigated using various in situ methods. The results showed that FePd3 absorbs small amounts of hydrogen at room temperature and follows the Sieverts' law. The [Pd-6] octahedral voids were filled with hydrogen atoms as the hydrogen pressure increased, leading to a decrease in long-range order of Fe and Pd atoms. The magnetic moments of iron atoms in FePd3 exhibited a temperature dependence that was consistent with a 3D Ising or Heisenberg model.
Article
Chemistry, Physical
Yang Meng, Shunlong Ju, Wei Chen, Xiaowei Chen, Guanglin Xia, Dalin Sun, Xuebin Yu
Summary: By fabricating V4Nb18O55 microspheres, the H-2 desorption and absorption properties of MgH2 can be improved and the uniform formation of Nb/V interfaces can be achieved, resulting in the reduction of dehydrogenation temperature of MgH2 and the enhancement of hydrogenation reaction rate.
Article
Chemistry, Multidisciplinary
Song Wang, Zili Wu, Sheng Dai, De-en Jiang
Summary: A deep-learning approach has been proposed to accelerate the determination of hydride locations in metal nanoclusters, overcoming the challenges of utilizing neutron crystallography. The method demonstrates efficiency in predicting hydride locations in copper nanoclusters and has the potential to be applied to other metal systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Sophia L. Wandelt, Alexander Mutschke, Dmitry Khalyavin, Robert Calaminus, Jennifer Steinadler, Bettina V. Lotsch, Wolfgang Schnick
Summary: Multianionic metal hydrides, with diverse physical properties and complex structures, have recently gained attention. In this study, we report the synthesis of Sr6N[BN2](2)H-3, the first compound that combines nitridoborate, nitride, and hydride anions. The crystal structure, determined using X-ray and neutron powder diffraction, reveals a three-dimensional network of nitridoborate units, strontium atoms, and hydride and nitride anions. Electrochemical measurements indicate the presence of hydride ion conductivity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Yusuke Onuki, Kasumi Masaoka, Shigeo Sato
Summary: The texture and microstructure formation of a Ca-added alloy, AZX612, during uniaxial tensile deformation at elevated temperatures is reported. The total elongation increases with temperature primarily due to prolonged unstable plastic deformation. The significant elongation at high temperatures is attributable to the relaxation of strain concentration via continuous dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
A. P. Baraban, I. A. Chernov, V. A. Dmitriev, D. Elets, I. E. Gabis, V. G. Kuznetsov, A. P. Voyt
Summary: We studied the synthesis reaction of Mg2NiH4 hydride films and found that a dense polycrystalline film of Mg2NiH4 hydride grows on a thin underlayer of intermetallic alloy MgNi2. The interface between MgNi2 and Mg2NiH4 is the most probable location of the growth reaction. We also observed cathode luminescence spectra of the Mg2NiH4 hydride film, which showed that Mg2NiH4 is an indirect gap semiconductor with a gap value of approximately 1.6 eV.
Article
Multidisciplinary Sciences
Philipp Kurzhals, Geoffroy Kremer, Thomas Jaouen, Christopher W. Nicholson, Rolf Heid, Peter Nagel, John-Paul Castellan, Alexandre Ivanov, Matthias Muntwiler, Maxime Rumo, Bjoern Salzmann, Vladimir N. Strocov, Dmitry Reznik, Claude Monney, Frank Weber
Summary: Electron-phonon coupling is a common phenomenon in solids, leading to emergent ground states such as superconductivity. This study demonstrates that strong phonon broadening can occur in the absence of Fermi surface nesting or lattice anharmonicity, if electron-phonon coupling is enhanced for specific electron momenta. The findings suggest a new mechanism for understanding phonon anomalies in materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Nayely Pineda-Romero, Matthew Witman, Vitalie Stavila, Claudia Zlotea
Summary: We conducted a thorough study on the effect of adding 10% Al into the Ti0.33V0.33Nb0.33 alloy on the hydrogen storage properties. The results showed that while the storage capacity decreased by 20%, several other properties were enhanced by the presence of Al, such as lower hydrogen desorption temperature and improved stability during cycling. This study demonstrates that adding Al into multi-principal element alloys is a promising strategy for designing novel materials for hydrogen storage.
Article
Crystallography
Nicolas Zapp, Denis Sheptyakov, Holger Kohlmann
Summary: Heteroanionic hydrides show great potential in functional materials design. By employing solid-state reactions, the cubic rare earth hydride oxides DyHO, ErHO, and LuHO were synthesized, each exhibiting unique crystal structures. Computational chemistry studies suggest that the formation of REHO compounds for smaller rare earth elements is less favorable compared to sesquioxides, requiring mild synthesis conditions for their synthesis.
Article
Materials Science, Multidisciplinary
J. M. Wilde, S. X. M. Riberolles, Atreyee Das, Y. Liu, T. W. Heitmann, X. Wang, W. E. Straszheim, S. L. Bud'ko, P. C. Canfield, A. Kreyssig, R. J. McQueeney, D. H. Ryan, B. G. Ueland
Summary: In this study, the three antiferromagnetic phases of EuMnSb2 and their magnetic structures were revealed through experimental data and analysis. It was found that the magnetic coupling between manganese and europium can tune the topological properties of the material, which is of significance for applications involving the topological features of this material.
Article
Materials Science, Multidisciplinary
Volodymyr A. Yartys, Vasyl V. Berezovets, Ponniah Vajeeston, Lev G. Akselrud, Vladimir Antonov, Vladimir Fedotov, Steffen Klenner, Rainer Poettgen, Dmitry Chernyshov, Michael Heere, Anatoliy Senyshyn, Roman V. Denys, Ladislav Havela
Summary: Understanding the relationship between the structure, composition, and hydrogenation properties of intermetallic hydrides is crucial for improving their hydrogen storage performance. The ability to form hydrides and control their interaction with hydrogen is determined by their chemical composition. This study investigated a ScNiSn-based intermetallic hydride using various experimental techniques, including synchrotron and neutron powder diffraction, Mössbauer spectroscopy, hydrogenation, and thermal desorption spectroscopy. Computational calculations were also performed. The study revealed the mechanism of phase-structural transformation and the formation of unique metal-hydrogen bonding in the intermetallic alloy. At high pressures, a TiNiSi-type hydride was formed. The study also showed that scandium behaves similarly to the heavy rare earth metal holmium.
Article
Energy & Fuels
V Yartys, I Zavaliy, V Berezovets, Yu Pirskyy, F. Manilevich, A. Kytsya, Yu Verbovytskyy, Yu Dubov, A. Kutsyi
Summary: An autonomous power supply device based on a 30 W fuel cell stack and a hydrolysis-type hydrogen generator was developed. It included the construction of a hydrogen generation unit, development of an electronic control unit, and performance testing and optimization. The system efficiently generates H-2 using a flat type reactor with Pt catalyst deposited on cordierite as a support and a 10% solution of NaBH4. The electronic control unit effectively regulates the hydrolysis reaction rate and provides the required hydrogen supply to the fuel cell.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Chemistry, Physical
Nicolas Madern, Judith Monnier, Jean -Claude Crivello, Junxian Zhang, Karine Provost, Valerie Paul-Boncour, Solenn Reguer, Dominique Thiaudiere, Michel Latroche
Summary: Various applications benefit from lanthanides-3d metals compounds due to their fundamental physicochemical properties. To overcome raw material criticality and geopolitical tension, a better understanding of ternary systems is required. This study focuses on the Mn-Ni-Sm system, which is useful for energy storage applications. The combination of different techniques provides a better understanding of the physicochemical properties and phase equilibrium of this system, including the substitution of Mn atoms in the Ni sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Maxime Dottor, Jean-Claude Crivello, Laetitia Laversenne, Jean -Marc Joubert
Summary: The Hf-H(D) system was investigated using in situ neutron diffraction to understand its behavior under different compositions and temperatures. This study provided new insights into the phase existence and phase diagram of the system. Two major findings were the discovery of a new phase (gamma, PtS structure type) similar to the monohydride found in the H-Zr system, and the determination of the structure of the 6' phase, which is an ordered superstructure of the 6 phase (CaF2 structure type). Phase relations were established, and a new phase diagram was proposed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
A. Moll, A. Hamidou, J. -C. Crivello, J. -M. Joubert, E. Alleno, C. Barreteau
Summary: We investigate the thermoelectric properties of SrCuX (X = P or Sb) using experiments and DFT calculations for the first time. Our calculations show that these stable and non-metallic compounds are suitable for thermoelectric applications. Experimental results confirm their non-metallic character, which is favorable for thermoelectricity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Andrzej Grzechnik, Vaclav Petricek, Dmitry Chernyshov, Charles McMonagle, Tobias Geise, Hend Shahed, Karen Friese
Summary: The structures and phase transitions in Rb2V3O8 and K2V3O8 mixed-valence vanadate fresnoites were studied using synchrotron single-crystal diffraction. The modulated structure of K2V3O8 was better described in (3 + 2)-dimensional space below 115 K. The modulation mainly involves rotations of VO4 and VO5 building units and slight variation of K-O distances. The high-brilliance synchrotron beam suppresses the incommensurate phase and the postulated phase transition in Rb2V3O8 was not observed.
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
(2023)
Article
Chemistry, Physical
Huanyu Zhang, Giulia Paggiaro, Faruk Okur, Janis Huwiler, Claudia Cancellieri, Lars P. H. Jeurgens, Dmitry Chernyshov, Wouter van Beek, Maksym V. Kovalenko, Kostiantyn V. Kravchyk
Summary: The deployment of LLZO garnets as solid-state electrolytes for Li-metal solid-state batteries is hindered by the reactivity with water and carbon dioxide, leading to the formation of a contamination layer on the LLZO surface. High temperature annealing is studied as a thermal cleaning method, which effectively reduces the contamination but also results in the formation of a different phase on the LLZO surface. The impact of these factors on the performance of Li/LLZO/Li symmetrical cells was evaluated.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Thomas Fernandes, Thomas Cavoue, Pascal Berger, Celine Barreteau, Jean-Claude Crivello, Nicolas Emery
Summary: In this study, the valence state of nickel ion in lamellar lithiated nitridonickelates was found to be close to +1.5, and a solid solution Li3-1.5xNixN was discovered. The attempt to introduce more nickel resulted in the presence of Li1.97Ni0.68N phase with metallic nickel as an impurity.
INORGANIC CHEMISTRY
(2023)
Editorial Material
Chemistry, Physical
Volodymyr A. Yartys, Fermin Cuevas
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Volodymyr A. Yartys, Colin J. Webb, Fermin Cuevas
Summary: The paper provides an overview of advanced in situ diffraction studies for probing the structure and reacting mechanisms of hydrogen and energy storage materials. These studies utilize high flux diffraction beam and high resolution measurements to establish the mechanism of phase-structural transformations and their kinetics. Various conditions, such as hydrogen/deuterium pressures and temperatures, as well as different charge-discharge states, are considered. The paper also highlights the contributions of Dr. Michel Latroche and summarises a long-standing collaboration between the co-authors in the field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Quentin Guesnay, Charles J. McMonagle, Dmitri Chernyshov, Waqas Zia, Alexander Wieczorek, Sebastian Siol, Michael Saliba, Christophe Ballif, Christian M. Wolff
Summary: High-vacuum, single-source thermal evaporation is an appealing deposition process for perovskite photovoltaics due to its promise of homogeneous and controlled growth of pure and uniform films. Mechanical synthesis of substoichiometric cesium bromide-lead iodide precursors and subsequent deposition and conversion processes were studied. The results show that no new phases were formed during ball-milling, and halide exchange between precursors occurs during the evaporation process. Furthermore, films with higher cesium bromide content exhibit more impurities, while optimized cesium bromide content leads to photovoltaic devices with 15% efficiency at an optical bandgap of 1.7 eV.
Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Sudip Chakraborty, Vidha Bhasin, Santanu Pakhira, Anis Biswas, Yaroslav Mudryk, Amit Kumar, Celine Barreteau, Jean-Claude Crivello, Amitabh Das, D. Bhattacharyya, Vitalij K. Pecharsky, Eric Alleno, Chandan Mazumdar
Summary: This study presents a new finding regarding the structural and magnetic properties of the quaternary Heusler alloy NiRuMnSn. Contrary to previous studies, it is observed that the ordered structure of this alloy exhibits a considerable decrease in spin polarization. Additionally, the compound displays a rare reentrant spin-glass behavior.
Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Sudip Chakraborty, Vidha Bhasin, Santanu Pakhira, Shovan Dan, Celine Barreteau, Jean -Claude Crivello, S. N. Jha, Maxim Avdeev, Jean-Marc Greneche, D. Bhattacharyya, Eric Alleno, Chandan Mazumdar
Summary: In this paper, the successful synthesis and properties of a Fe-based highly spin-polarized quaternary Heusler alloy FeMnVGa are reported. Experimental and theoretical investigations reveal its high spin polarization (89.9%) and robustness of half-metallic ferromagnetic property in the presence of atomic disorder. The compound demonstrates great potential for spintronics applications.
Review
Energy & Fuels
Thabang R. Somo, Mykhaylo V. Lototskyy, Volodymyr A. Yartys, Moegamat Wafeeq Davids, Serge Nyallang Nyamsi
Summary: High entropy alloys (HEAs) formed by multi-principal elements show promising hydrogen storage performance. The properties of HEAs are related to their chemical composition and constituent elements, including electronegativity, atomic radii, and valence electron concentration. This review aims to clarify these features by performing systematic analysis of available experimental data. The analysis shows that valence electron concentration plays the most significant role in tuning the hydrogen storage performance of HEAs.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Maxime Dottor, Jean-Claude Crivello, Jean -Marc Joubert
Summary: The phase diagram and thermodynamic data of the H-Nb system are evaluated and re-assessed to improve the description of this system. Experimental data reveals the solubility of niobium into the ε-ZrH2 phase, and Density Functional Theory calculations are used to determine the formation enthalpies of all the compounds and the mixing enthalpies in the different phases. Finally, a Calphad model for the H-Nb-Zr system is developed using literature data as well as experimental and calculated data.
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.