Article
Chemistry, Physical
Sahil Tippireddy, Feridoon Azough, Animesh Bhui, Iuliia Mikulska, Robert Freer, Kanishka Biswas, Paz Vaqueiro, Anthony V. Powell
Summary: CuFeS2 is a promising n-type thermoelectric candidate for low-grade waste heat recovery. In this study, chromium-containing CuFeS2 materials were synthesized, resulting in the formation of a composite with Cr-rich precipitates embedded in the CuFeS2 matrix. By reducing a portion of Fe(3+) ions to Fe2+, the Cu:Fe ratio of the CuFeS2 phase was altered, indirectly affecting the electrical properties. Additionally, the presence of nano-sized precipitates and dislocations significantly reduced the lattice thermal conductivity, resulting in an enhanced thermoelectric figure-of-merit.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Vikash Sharma, Divya Sharma, Ranu Bhatt, Pankaj K. Patro, Gunadhor Singh Okram
Summary: We report on the thermoelectric properties of nickel-doped Ag2-xNixTe nanostructures in a certain temperature range. The material undergoes a metal-insulator transition with increasing nickel doping concentration. The electrical resistivity and Seebeck coefficient show linear relationships with temperature. The material achieves higher thermoelectric coefficient through a sharp decrease in thermal conductivity associated with a structural phase transition.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Riddhimoy Pathak, Debattam Sarkar, Kanishka Biswas
Summary: By co-doping Ag and Mg in SnTe, the TE performance can be significantly improved, enhancing the Seebeck coefficient and reducing thermal conductivity to achieve a high figure of merit at 865 K.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Pradeep Kumar Sharma, T. D. Senguttuvan, V. K. Sharma, Pankaj Patro, Sujeet Chaudhary
Summary: In this study, the thermoelectric performance of PbTe compound was significantly improved through bismuth doping and dispersing SiC nanoparticles. Bismuth doping improved the electrical conductivity, while SiC nanoparticles regulated the Seebeck coefficient and suppressed the lattice thermal conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Yitong Guo, Jingyang Du, Meihua Hu, Bin Wei, Taichao Su, Aiguo Zhou
Summary: In this study, the thermoelectric performance of Bi2Te3 was improved by incorporating Mo2C MXene, a two-dimensional material with moderate thermoelectric performance. The properties of Mo2C MXene were characterized, and it was found to be an N-type conductor with a Seebeck coefficient of -9.25 µV/K. The composite powders of Bi2Te3/Mo2C MXene were prepared and the resulting bulk samples showed enhanced thermoelectric properties, with a ZT value of 0.26 at 473 K, 78.6% higher than that of pure Bi2Te3. This is the first report on regulating thermoelectric performance using Mo2C MXene.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Stephane Grauby, Aymen Ben Amor, Geraldine Hallais, Laetitia Vincent, Stefan Dilhaire
Summary: With a specially designed AFM set-up, the research team has developed and validated a prototype capable of detecting both thermal and electrical properties simultaneously. AFM approach allows imaging of nanostructures and extraction of physical properties, paving the way for quantitative estimation of the figure of merit of nanostructures.
Article
Materials Science, Ceramics
Asmaa Nour, Heba M. Refaat, A. El-Dissouky, Hesham M. A. Soliman
Summary: A scalable and synthetic approach was used to prepare novel nanocomposites with enhanced thermoelectric performance by incorporating reduced graphene oxide, carbon nitride, and europium into bismuth telluride matrix. The addition of these materials changed the physicochemical and thermoelectric properties of bismuth telluride, resulting in increased electrical conductivity and decreased thermal conductivity. These nanocomposites show potential for power generation applications at room temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jinfeng Dong, Jun Pei, Kei Hayashi, Wataru Saito, Hezhang Li, Bowen Cai, Yuzuru Miyazaki, Jing-Feng Li
Summary: The addition of Ag2S in MnTe can significantly reduce lattice thermal conductivity, enhance electrical conductivity, and improve thermoelectric performance.
JOURNAL OF MATERIOMICS
(2021)
Article
Chemistry, Multidisciplinary
Zhong-Zhen Luo, Songting Cai, Shiqiang Hao, Trevor P. Bailey, Yubo Luo, Wenjun Luo, Yan Yu, Ctirad Uher, Christopher Wolverton, Vinayak P. Dravid, Zhigang Zou, Qingyu Yan, Mercouri G. Kanatzidis
Summary: Zn plays a crucial role in enhancing the thermoelectric performance of Ga-doped PbTe by improving electronic transport properties and reducing lattice thermal conductivity, resulting in a significant increase in the figure of merit.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Shaochang Song, Yu-Chih Tseng, Yurij Mozharivskyj
Summary: This study attempted to optimize the electrical and thermal conductivity of SnTe by introducing a strong atomic disorder through alloying with AgSnSe2. It was found that the alloying significantly decreased the thermal conductivity and provided a good electrical conductivity in the alloyed samples. Substituting Pb for Sn further improved the thermoelectric performance of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Okmin Park, Kyu Hyoung Lee, Sang Jeong Park, Se Woong Lee, Sang-il Kim
Summary: This study reports the improved thermoelectric properties of singly and lightly Pb-doped Sb2Te3 polycrystalline alloys, with increased carrier transport properties and electrical conductivity, decreased Seebeck coefficient, and reduced lattice thermal conductivity. The maximum thermoelectric figure of merit achieved is 0.97, which is the highest reported value for singly-doped Sb2Te3-based alloys. The maximum energy conversion efficiency is calculated to be 9.0% for a temperature difference of 350 K, surpassing other singly or codoped Sb2Te3 alloys.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
Minsu Kim, Dabin Park, Jooheon Kim
Summary: In this study, carbon cloth was used as a flexible and conductive substrate, and Te nanowires were synthesized on it using a hydrothermal reaction. Sb2Te3 nanowires with longer and more uniform wire shape were then synthesized on the carbon cloth. Nb-doped Sb2Te3 nanowires exhibited the highest power factor. A flexible thermoelectric generator consisting of p-type Sb2Te3 nanowires and n-type Bi2Te3 nanowires showed high voltage and power output.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Polymer Science
Ruchita Jani, Niall Holmes, Roger West, Kevin Gaughan, Xiaoli Liu, Ming Qu, Esther Orisakwe, Lorenzo Stella, Jorge Kohanoff, Hongxi Yin, Bartlomiej Wojciechowski
Summary: Thermoelectric materials can convert thermal energy into electrical energy, and can be used to harvest the heat energy generated by temperature differences between the inside and outside of buildings. This paper presents research on the development and characterization of a cement-based thermoelectric material, which is doped with metal oxides to enhance its thermoelectric properties. The study also discusses the positive impact of moisture content on the electrical conductivity of the material.
Article
Materials Science, Ceramics
H. Y. Hong, D. H. Kim, K. Park
Summary: In this study, the thermoelectric properties of Bi0.97Na0.03CuSeO were systematically investigated by doping Mg2+ ions. The Mg2+ doping significantly enhanced the electrical conductivity by increasing hole concentration and reducing phonon thermal conductivity. By improving the thermoelectric power factor and reducing the thermal conductivity, the thermoelectric performance of Bi0.97Na0.03CuSeO was significantly improved.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Pathan Sharief, Peyala Dharmaiah, Babu Madavali, Jun Woo Song, Jin Kyu Lee, Jong Hyeon Lee, Soon-Jik Hong
Summary: This study proposes a layered structure approach to improve the performance of thermoelectric materials by arranging different microstructure materials in a layered manner, optimizing the electrical conductivity and Seebeck coefficient, and thereby increasing the ZT value.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Shengqiang Liu, Yuantian Zheng, Dengfeng Peng, Jing Zhao, Zhen Song, Quanlin Liu
Summary: NIR ML materials, such as gallate spinel and gallate magnetoplumbite doped with Cr3+, have shown bright NIR ML behavior under low load and exhibit excellent tissue penetration and concealment capability. They have great potential in the fields of bio-medicine and anti-counterfeiting.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiawei Lin, Zhongnan Guo, Kunjie Liu, Niu Sun, Jindong Cao, Xin Chen, Jing Zhao, Quanlin Liu, Wenxia Yuan
Summary: A new zero-dimensional organic-inorganic metal hybrid material (C13H14N)(2)InCl5 is reported, which exhibits blue emission under UV light and can achieve emission covering the entire visible spectrum by incorporating Sb3+. This material has tunable cold to warm white emission and an ultra-high color rendering index (CRI) of up to 96.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Shengqiang Liu, Rujun Yang, Hao Cai, Yixi Zhuang, Zhen Song, Lixin Ning, Quanlin Liu
Summary: This study reports the electron tunneling charging behavior in Cr3+, Sm3+ co-doped near-infrared persistent luminescence material SrGa12O19, allowing for efficient charging by incoherent visible light. The electrons are efficiently captured by nearby Ga-II-O2- electron-hole trap centers via a tunneling process and transferred to shallow traps through a persistently energetic optical pump. The PersL performance is further optimized by engineering the energy band through partial substitution of In3+ for Ga3+. Insights into electron tunneling charging under low-energy excitation for near-infrared persistent luminescence are provided, inspiring more explorations for practical applications.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Shihui He, Shiqiang Hao, Liubing Fan, Kunjie Liu, Chuxin Cai, Christopher Wolverton, Jing Zhao, Quanlin Liu
Summary: Five 0D Zn-based hybrid halides with aromatic organic cations of different carbon-chain lengths were synthesized, and (PMA)2ZnCl4 exhibited the highest photoluminescence quantum yield among reported Zn-based white-emission OIMHs. (PBA)2ZnI4 showed the highest color rendering index among single-component white-light-emitting phosphors. The study demonstrated that the selection of appropriate organics and halogens can enable fine tuning of single-component white-light emission, satisfying varying needs for solid-state lighting.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zhen Song, Zhengxiao Li, Jiahao Zhang, Zeyao Chen, Leopoldo Suescun, Quanlin Liu
Summary: This work provides an online calculator to characterize the polyhedral distortion based on the best fitted idealized polyhedron method. It works by fitting an idealized oriented polyhedron to a collection of center and vertex coordinates. The function can be accessed at http://bfip.crystalstructure.cn.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Chemistry, Physical
Shangqing Qu, Jinhao Chen, Jikun Chen, Guohong Cai, Yonggang Wang, Zhongnan Guo, Jing Zhao, Quanlin Liu
Summary: We report the synthesis of a quaternary selenide, In0.5Mn2Bi3.5Se8, which shows good thermal stability and has potential for thermoelectric applications. It exhibits semiconductor properties with electrical conductivity and Seebeck coefficient exceeding 3 S/cm and 300 μV/K at 810 K. This finding enriches our understanding of the pavonite homologous series and provides valuable insights for future exploration in related fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Optics
Yuhe Shao, Hao Cai, Fangyi Zhao, Zhen Song, Quanlin Liu
Summary: This study presents a new blue-violet phosphor SrSc4Si5O17:Ce3+ with a small stokes-shift, which exhibits efficient luminescence. The fabricated white light-emitting diodes show excellent color rendering index, indicating the potential of this phosphor in indoor healthy lighting and agricultural lighting applications.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Chao Dou, Chuxin Cai, Zhen Song, Quanlin Liu
Summary: By partially replacing Al3+ with Ga3+, the photoluminescence intensity, internal/external quantum efficiency, and thermal stability of NIR phosphors are improved, resulting in a high electro-optical efficiency for NIR pc-LED devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Shengqiang Liu, Jingxuan Du, Zhen Song, Chonggeng Ma, Quanlin Liu
Summary: The development of high-performance NIR light-emitting materials is crucial for meeting the increasing demand for high-contrast biological imaging, non-destructive testing, and infrared night vision. This study reports the first-ever NIR-II broadband luminescence based on the intervalence charge transfer (IVCT) of Cr3+-Cr3+ aggregation in gallate magentoplumbite. The application of LaMgGa11O19:0.7Cr(3+) in NIR-II biological imaging, non-destructive testing, and night vision is demonstrated, providing new insights into broadband NIR-II luminescence under UV-NIR excitation based on the IVCT of Cr3+-Cr3+ aggregation.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Correction
Multidisciplinary Sciences
Zhen Song, Quanlin Liu
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Jindong Cao, Kunjie Liu, Mingzhen Quan, An Hou, Xingxing Jiang, Zheshuai Lin, Jing Zhao, Quanlin Liu
Summary: Mixing cations with different chemical properties is a new approach for tuning the optical properties of hybrid organic-inorganic metal halides (HOIMHs). In this study, zero-dimensional (C9N3H15)(C9H13SO)MBr6 (M = Bi/Sb) with two different cations were synthesized, resulting in significant second harmonic generation. The synthesized compounds exhibited direct bandgaps and bright yellow emission due to fluorescence emission.
DALTON TRANSACTIONS
(2023)
Article
Materials Science, Multidisciplinary
Chuxin Cai, Shengqiang Liu, Fangyi Zhao, Hao Cai, Zhen Song, Quanlin Liu
Summary: Efficient Cr3+-doped Ca3Al2-yScyGe3O12 garnet phosphors were designed to enhance NIR luminescence efficiency through octahedral distortion. The composition with y = 0.2 showed the highest luminescence intensity, and the optimal Ca3Al1.8Sc0.2Ge3O12:0.04Cr(3+) phosphor exhibited excellent thermal stability and high NIR output power.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Inorganic & Nuclear
Liubing Fan, Shiqiang Hao, Shihui He, Xusheng Zhang, Mingyang Li, Christopher Wolverton, Jing Zhao, Quanlin Liu
Summary: In this study, three hybrid metal halides (Bmpip)(2)ZnBr4, (Bmpip)(2)CdBr4, and (Bmpip)(8)Pb11Br30 were synthesized and characterized. These compounds exhibit excellent stability and broad emissions. The emission mechanisms involve both the organic cations and self-trapped excitons (STEs) in (Bmpip)(2)ZnBr4 and (Bmpip)(2)CdBr4, while in (Bmpip)(8)Pb11Br30, the emission is mainly attributed to STEs. This work contributes to our understanding of the structure types and diverse emission mechanisms of hybrid metal halides.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Chao Dou, Fangyi Zhao, Shengqiang Liu, Zhen Song, Quanlin Liu
Summary: In this work, blue phosphors with red-shifted photoluminescence excitation spectra were successfully synthesized by partially introducing N3- into a matrix. The optimal sample BAON(1.0):Eu showed internal/external quantum efficiency values of 80%/52% under the excitation of 400 nm violet light, and the retained integrated emission intensity at 150 degrees C was 95% of that at room temperature. A WLED device fabricated by coating BAON(1.0):Eu and other commercial phosphors achieved an ultra-high color rendering index of 95.4.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Shuxin Wang, Hanlin Li, Zhen Song, He Jiang, Xiandi Zhang, Chui-Shan Tsang, Quanlin Liu, Lawrence Yoon Suk Lee, Dongge Ma, Wai-Yeung Wong
Summary: By constructing D-pi-A molecules and introducing pi-conjugated anthracene unit as part of an appropriate donor-acceptor structure, efficient HLCT emitters can be finely regulated and versatilely constructed. The blue OLEDs using TAP1 and TAP2 as emitters exhibit good color purity, high efficiency, and extremely low efficiency roll-offs. This study provides inspiration for the rational design of promising materials for high-performance blue OLEDs.
JOURNAL OF MATERIALS CHEMISTRY C
(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.
