Article
Materials Science, Multidisciplinary
Wenliang Yao, Shunbo Hu, Fanhao Jia, Jeffrey R. Reimers, Yin Wang, David J. Singh, Wei Ren
Summary: This study investigates the changes in band edge of Mg2Si1-xSnx solid solutions using first-principles calculations and finds that strain and disorder play important roles in enhancing the thermoelectric performance.
Article
Materials Science, Multidisciplinary
Gagan K. Goyal, T. Dasgupta
Summary: In this study, a TEG module consisting of Mg(2)Si(0.3)Sn(0.7) n and p legs was fabricated and its thermoelectric generator characteristics were investigated. Compositions with peak zT values of approximately 1.6 and 0.44 for n and p doped legs, respectively, were synthesized successfully using induction assisted melt synthesis. The maximum power output and efficiency of the TE device were measured, showing promise for commercialization in the future.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Tsutomu Kanno, Hiromasa Tamaki, Masato Yoshiya, Hiroshi Uchiyama, Sachiko Maki, Masaki Takata, Yuzuru Miyazaki
Summary: A study on Mg3Sb2 revealed it to be heavily disordered with Frenkel defects and charge-neutral defect complexes. This compound exhibits exotic n-type dopability and a deviation from the standard temperature dependency in terms of thermal conductivity.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Mechanics
Xiaojuan Tian, Yueting Zhou, Chuanzeng Zhang
Summary: This paper investigates the frictionless contact problem of a functionally graded thermoelectric (FGTE) layered half-plane under the action of a rigid flat punch. The electro-thermo-elastic properties of the FGTE materials vary exponentially with thickness. The numerical results show that the contact behavior of the FGTE coating-TE substrate systems is significantly influenced by the imperfect interface condition and the material property gradient.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Vasavi Boggarapu, P. S. Rama Sreekanth, Venkateswara Babu Peddakondigalla, Phani Prasanthi Parvathaneni, Shakuntla Ojha, Jayachandra Gujjala, Satish Jain, Suresh Babu Valasingam, Raghavendra Gujjala
Summary: A five-layered aluminum-copper metal functionally graded material was developed through powder metallurgy process. Erosion wear and abrasive wear of the material were evaluated. The erosion wear decreased with an increase in copper content, and the formation of Al2Cu phase enhanced the erosion resistance. The specific wear rate of the material increased with an increase in load in abrasive wear tests, and the material showed different wear rates on different abrasive surfaces.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2023)
Article
Chemistry, Physical
Sushantika Choudhary, Saravanan Muthiah, Sanjay R. Dhakate
Summary: This study presents a simple production method for Mg2Si1-xSnx material using an in situ plasma-assisted reaction sintering process, achieving enhanced thermoelectric properties, remarkable hardness value, and high fracture strength. The synthesized composite material improves both the mechanical robustness and superior thermoelectric performance of Mg2Si1-xSnx based materials, which is essential for their commercial viability.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Sanyukta Ghosh, Umasankar Rout, Krushna Kumari Raut, Anirudha Karati, Gerda Rogl, Peter Franz Rogl, Ernst Bauer, B. S. Murty, Ramesh Chandra Mallik
Summary: Filling the voids of a skutterudite material with suitable electropositive elements can greatly affect the power factor by altering carrier concentration. Doping and filling can further enhance the thermoelectric properties. Electropositive n-type fillers have been successfully used in Co4Sb12. In this study, Fe was substituted as a p-type dopant in S0.15Co4Sb12, resulting in the highest zT value.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Shrabani Paul, Umapada Pal, Swapan Kumar Pradhan
Summary: Antimony telluride nanoparticles of different sizes were fabricated by mechanical alloying and annealing, and their grain growth, electrical, and thermoelectric properties were studied. Thermal annealing significantly improved electrical conductivity and thermoelectric figure of merit, while reducing grain size improved the thermoelectric performance by lowering thermal conductivity. The temperature-dependent Lorenz number was used to analyze the electronic contribution to total thermal conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Ganesh Shridhar Hegde, A. N. Prabhu, Y. H. Gao, Y. K. Kuo, V. Raghavendra Reddy
Summary: In this study, high-quality single crystals of potential thermoelectric materials (Bi1-xInx)(2)Se2.7Te0.3 grown by the melt growth technique were investigated for thermoelectric properties between 10 and 350 K. Analysis showed that co-doped samples exhibited significantly enhanced power factor and thermoelectric figure of merit compared to the pristine sample, with the highest ZT value achieved at 350 K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Marcello Cabibbo, Alessandra Fava, Roberto Montanari, Ekaterina Pakhomova, Chiara Paoletti, Maria Richetta, Alessandra Varone
Summary: In this study, a W coating was deposited on a CuCrZr substrate with a gradually changing interlayer of Cu and W using PS in Ar-H-2 atmosphere. Nano-indentation tests were conducted to determine the hardness gradient of W and Cu along the interlayer. Microstructural examinations revealed that the hardness gradient is influenced by the texture.
APPLIED SCIENCES-BASEL
(2022)
Article
Nanoscience & Nanotechnology
Irena Jankowska-Sumara, Marek Pasciak, Maria Podgorna, Andrzej Majchrowski, Milos Kopecky, Jiri Kub
Summary: Pb(Zr1-xSnx)O-3 single crystals were characterized using x-ray diffraction to study the structure of two intermediate phases between antiferroelectric and paraelectric phases. The lower-temperature intermediate phase is characterized by incommensurate displacive modulations in the Pb sublattice, while the higher temperature intermediate phase is characterized by distortions of the oxygen sublattice primarily in the form of anti-phase tilts of the oxygen octahedra. Additionally, structured diffuse scattering was observed in the paraelectric phase along Γ-M and M-R lines indicating high-temperature correlated disorder of Pb ions and octahedral rotations.
Article
Nanoscience & Nanotechnology
Wei Niu, Xiaoshan Cao, Yifeng Hu, Fangfang Wang, Junping Shi
Summary: This study investigates the temperature field distribution and thermoelectric conversion efficiency of annular thermoelectric generators with functionally graded materials. Using the power series method, numerical studies were conducted on FGM TE generators with different variations in material parameters, providing theoretical guidance for optimization of such generators. The results showed that material parameters play a significant role in the efficiency of the generators.
Article
Physics, Condensed Matter
Arun Raphel, Appu Kumar Singh, P. Vivekanandhan, S. Kumaran
Summary: The study successfully synthesized a high-density nanocrystalline lead-tin-selenium-tellurium high-entropy alloy, achieving excellent thermoelectric performance by reducing lattice thermal conductivity.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Nanoscience & Nanotechnology
Meet Jaydeepkumar Oza, Karl Guenter Schell, Ethel Claudia Bucharsky, Tapas Laha, Siddhartha Roy
Summary: A systematic methodology has been established to develop hybrid Al-SiC-graphite functionally graded composite materials with the highest feasible SiC-content in the top-most layer. The mechanical properties of the monolithic composites were compared with the corresponding FGM properties, showing that the top-layer hardness of FGM is significantly higher due to locally high SiC-content. Additionally, the flexural stress-strain behavior of individual mono-layers and the overall FGM was studied, revealing that the orientation of FGM has a strong influence on its flexural stress-strain behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Shrabani Paul, Umapada Pal, Swapan Kumar Pradhan
Summary: This study investigates the synthesis and thermoelectric performance of Bi2Te3 nanocrystals. The thermoelectric properties of the nanocrystals are significantly improved through thermal annealing treatment.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Magnus Klove, Sanna Sommer, Bo B. Iversen, Bjork Hammer, Wilke Dononelli
Summary: A machine learning model incorporating density functional theory calculations and comparison of PDFs can be used to determine the crystal structure of unknown compounds, allowing for the identification of metastable configurations and stacking disorders.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jonas Ruby Sandemann, Thomas Bjorn Egede Gronbech, Kristoffer Andreas Holm Stockler, Feng Ye, Bryan C. Chakoumakos, Bo Brummerstedt Iversen
Summary: ZnFe2O4 exhibits spin-glass transition and has dominant ferromagnetic and antiferromagnetic correlations. The 3D-m Delta PDF method is used to visualize the local magnetic ordering preferences.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Nils Lau Nyborg Broge, Andreas Dueholm Bertelsen, Frederik Sondergaard-Pedersen, Bo Brummerstedt Iversen
Summary: High-entropy alloys (HEAs) are a promising class of materials with extraordinary properties and customization potential through stoichiometry changes. This study presents a solvothermal method for synthesizing eight-component Pt-Ir-Pd-Rh-Ru-Cu-Ni-Co nano-HEA nanoparticles, which can be produced in large quantities. The method relies on simple autoclaves and in situ X-ray scattering experiments suggest auto-catalyzed growth of the particles, extending understanding of HEA nanomaterials.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Peter Skjott Thorup, Rasmus Stubkjaer Christensen, Martin Roelsgaard, Bo Brummerstedt Iversen
Summary: The segmented beta-Zn4Sb3 pellets with ion-blocking steel interfaces exhibit improved stability under thermoelectric operating conditions, as shown by quantitative phase analysis and microstructure analysis.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Jonas Beyer, Thomas Bjorn Egede Gronbech, Jiawei Zhang, Kenichi Kato, Bo Brummerstedt Iversen
Summary: The electron density and thermal motion of diamond were studied using synchrotron powder X-ray diffraction. The thermal motion was decoupled from the electron density using theoretical static structure factors from density functional theory calculations. The results showed harmonic and isotropic thermal motion, and good agreement was observed between experimental atomic displacement parameters and calculations. The Debye temperature of diamond was experimentally determined to be 1883 (35) K. The temperature dependence of the electron density at the bond critical point was found to be constant throughout the temperature range, confirming the validity of the crystallographic convolution approximation for diamond.
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Lise Joost Stockler, Lennard Krause, Bjarke Svane, Kasper Tolborg, Bo Richter, Seiya Takahashi, Tomoki Fujita, Hidetaka Kasai, Michihiro Sugahara, Ichiro Inoue, Eiji Nishibori, Bo Brummerstedt Iversen
Summary: Despite the scientific possibilities, the application of serial femtosecond crystallography for small-unit-cell systems has been limited due to the lack of reliable data reduction methods. However, a data reduction pipeline capable of fully automated handling has been developed, allowing successful reduction and structure solving of a compound. The pipeline is expected to open up new research opportunities in small-unit-cell serial femtosecond crystallography experiments.
Article
Chemistry, Multidisciplinary
Jiawei Zhang, Daisuke Ishikawa, Michael M. Koza, Eiji Nishibori, Lirong Song, Alfred Q. R. Baron, Bo B. Iversen
Summary: We have revealed the correlation between loosely bonded atoms and strong anharmonicity in thermoelectric material InTe, using chemical bonding analysis, inelastic X-ray and neutron scattering, and first principles phonon calculations. Our findings indicate that highly anharmonic phonons in InTe arise from the covalency between delocalized In1+ 5s(2) lone pair electrons and Te 5p states. This work provides insights into the microscopic origin of strong anharmonicity in rattling atoms and has implications for designing efficient thermoelectric materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
Karl F. F. Fischer, Bjarke B. Demant, Lasse R. Jorgensen, Bo B. Iversen
Summary: Ruthenium arsenide can be made p-type by adding germanium, and it has a wide substitution range without affecting stability. RuAs2-xGex (x = 0.02, 0.04, 0.08, 0.16, 0.32, and 0.64) shows that the saturation limit of germanium is between 0.16 and 0.32. The electrical contribution to thermoelectric performance is greatly improved with a power factor of 1.03 mW/(m K-2). However, the lattice rigidity is not affected by substitution, as the Debye temperature remains around 420 K, resulting in a modest maximum zT of 0.11.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Sajesh P. Thomas, Anna Worthy, Espen Z. Eikeland, Amy J. Thompson, Arnaud Grosjean, Kasper Tolborg, Lennard Krause, Kunihisa Sugimoto, Mark A. Spackman, John C. McMurtrie, Jack K. Clegg, Bo B. Iversen
Summary: This article reports a mechanically flexible one-dimensional coordination polymer that exhibits elastic bending. By utilizing various techniques including XRD, high-pressure crystallography, synchrotron micro-XRD mapping, and high-resolution synchrotron X-ray charge density analysis, the inter and intra-chain bonding as well as structural flexibility were quantitatively investigated. The results reveal that the helical coordination polymer behaves like a spring when subjected to external stimuli. The exceptional coordination sphere flexibility, attributed to the presence of Jahn-Teller distorted coordination bonds, contributes to the polymer's flexibility.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Brian Dusolle, Veronique Jubera, Evgeniy S. Ilin, Patrick Martin, Gilles Philippot, Matthew R. . Suchomel, Bo B. Iversen, Samuel Marre, Cyril Aymonier
Summary: Extensive research on nanosized ZnO finds its optical properties challenging to control due to various possible defects producing emissions in the visible range. A low-temperature, supercritical-fluid-driven synthesis proposed by our group produces isotropic nanosized particles with a pure excitonic emission comparable to single crystals. This article reports the growth mechanism and optical properties of the excitonic emission, as well as its phonon coupling with the E2 high vibrational mode at liquid helium temperatures.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Nikolaj Roth, Bo Brummerstedt Iversen
Summary: The superionic conductor Cu2-xSe has been studied and the large vibrations with extreme anharmonicity of Cu ions within a tetrahedron-shaped volume in the structure have been observed. The analysis of electron density suggests infrequent jumps between sites, supporting recent quasi-elastic neutron scattering data and challenging the phonon-liquid picture. The low thermal conductivity is likely not caused by the diffusion of Cu ions.
Article
Chemistry, Multidisciplinary
Martin Roelsgaard, Magnus Klove, Rasmus Christensen, Andreas D. Bertelsen, Nils L. N. Broge, Innokenty Kantor, Daniel Risskov Sorensen, Ann-Christin Dippel, Soham Banerjee, Martin V. Zimmermann, Philipp Glaevecke, Olof Gutowski, Mads Ry Vogel Jorgensen, Bo Brummerstedt Iversen
Summary: Understanding nucleation and growth mechanisms in hydro- and solvothermal conditions is crucial for tailoring functional nanomaterials. High-energy synchrotron radiation enables real-time characterization of nanocrystals using powder X-ray diffraction and X-ray total scattering. Recent developments in in situ setups at PETRA III and MAX IV beamlines allow for studying nucleation and growth phenomena in solvothermal synthesis, providing data for Rietveld refinement and pair distribution function refinement within 4 ms.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Chemistry, Physical
Lise Joost Stockler, Rasmus Stubkjaer Christensen, Magnus Klove, Andreas Dueholm Bertelsen, Anders Baek Borup, Lennard Krause, Seiya Takahashi, Tomoki Fujita, Hidetaka Kasai, Ichiro Inoue, Eiji Nishibori, Bo Brummerstedt Iversen
Summary: Promising results were obtained from PDF analysis using X-ray scattering data on a suspension of HfO2 nanoparticles measured at the SACLA XFEL facility. The study encourages further research in ultrafast structural science.
Article
Chemistry, Multidisciplinary
Jonas Ruby Sandemann, Kristoffer Andreas Holm Stockler, Xiaoping Wang, Bryan C. Chakoumakos, Bo Brummerstedt Iversen
Summary: Accurate structural models are crucial for understanding the structure-property relationships in functional materials. This study focuses on the complex crystal structures of spinels and establishes a benchmark crystal structure for defect-free spinel ferrite ZnFe2O4. Various diffraction techniques are used to provide reference data for testing and refining structural models. The results demonstrate the significance of atomic displacement parameters in accurately describing the cation inversion in spinel-type materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ida Gjerlevsen Nielsen, Magnus Klove, Martin Roelsgaard, Ann-Christin Dippel, Bo Brummerstedt Iversen
Summary: In this study, the formation mechanisms and crystal structure transformations of gallium oxides during solvothermal synthesis were investigated using in situ X-ray diffraction. It was found that the formation mechanism of γ-Ga2O3 involves the transformation from γ-Ga2O3 to β-Ga2O3, while GaOOH and Ga5O7OH form in aqueous solvent at low temperatures. The properties of the resulting products can be controlled by adjusting synthesis parameters such as temperature, heating rate, solvent and reaction time.
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.
