Article
Chemistry, Physical
Thi Huong Nguyen, Van Quang Nguyen, Jong Ho Park, Thi Toan Tran, Anh Tuan Pham, Sudong Park, Jong-Soo Rhyee, Sunglae Cho
Summary: We fabricated undoped and (Te, Zn)-codoped n-type CuAgSe polycrystals successfully. The (Te, Zn) codoping on CuAgSe reduces the lattice thermal conductivity to about 0.3 W m(-1) K-1 at 673 K and increases the electrical conductivity. Particularly, a ZT value of 0.91 was achieved at 623 K, which is the highest ZT value in n-type CuAgSe. Therefore, the Te and Zn codoping is a potential way to improve the thermoelectric performance of n-type CuAgSe.
ACS APPLIED ENERGY MATERIALS
(2023)
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
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
Kuo-Chuan Chang, Chia-Jyi Liu
Summary: BiCuSeO demonstrates remarkable low thermal conductivity among oxides, with Cu atoms playing a more significant role in reducing lattice thermal conductivity than the lone pair of Bi3+ and point defects brought about by elemental doping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
R. S. Nair, M. S. Rang, Paul J. Kelly
Summary: A density-functional-theory-based relativistic scattering formalism was used to study charge transport through thin Pt films with room-temperature lattice disorder. The research found that a Fuchs-Sondheimer specularity coefficient is needed to describe the suppression of charge current at the surface, even in the absence of surface roughness. It was also discovered that the spin Hall effect is substantially enhanced at the surface, with a reduced value of the spin Hall angle.
Article
Chemistry, Multidisciplinary
Yingcheng Zhao, Zejun Li, Yueqi Su, Changzheng Wu, Yi Xie
Summary: Lowering thermal conductivity via heterointerfaces is a common strategy for optimizing thermoelectric performance, but often results in decreased electrical conductivity. This study presents an ordered magnetic heterostructure superlattice synthesized by van der Waals confined epitaxial growth, which achieves a maximized filling amount to decrease thermal conductivity while maintaining carrier transport path.
Article
Materials Science, Multidisciplinary
Hongyu Chen, Zexin Feng, Han Yan, Peixin Qin, Xiaorong Zhou, Huixin Guo, Xiaoning Wang, Haojiang Wu, Xin Zhang, Ziang Meng, Zhiqi Liu
Summary: Unexpected weak anomalous Hall effect was found in polycrystalline thin films of chromium, possibly attributed to noncollinear spin textures induced by local spin frustration and rearrangement. A dominant intrinsic Berry phase mechanism is speculated. This may be a general feature for collinear antiferromagnetic thin-film materials with moderately high defect concentrations, making them promising candidates for emergent antiferromagnetic spintronics.
Article
Materials Science, Multidisciplinary
Weiwei Wu, Jinfeng Li, Zhiyu Liao, Hongyu Jiang, Laiquan Shen, Lin Gu, Xianggang Qiu, Yugui Yao, Haiyang Bai
Summary: The study reveals the linear dependence of anomalous Hall conductivity on magnetization in ferromagnetic metallic glasses, which indicates intrinsic mechanism contribution. Additionally, the influence of Berry curvature density and spin orientation fluctuations on the anomalous Hall effect is also highlighted.
Article
Materials Science, Ceramics
B. KaniAmuthan, Rajiu Venkatesan, R. Nagaraj, Karuppannan Aravinth, P. Ramasamy
Summary: This paper reports that TlBiSe2 polycrystal material exhibits an incommensurate (IC) phase (disordered structure). The 'Tl+' connecting chains and the disordered structure enhance the TE properties in TlBiSe2.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Shigeru Katsuyama, Kohei Kamoya
Summary: A sintered composite made of p-type Si0.99B0.01 and insulative SiO2 particles was studied for its thermoelectric properties. The electrical conductivity and thermal conductivity of the composite were found to change with the volume fraction of Si0.99B0.01, showing specific trends at different stages of volume fraction increase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Nhat Quang Minh Tran, Michitaka Ohtaki, Koichiro Suekuni
Summary: High-temperature thermoelectric properties of tungsten-based Magne'li phase oxide (W1-xTix)18O49 (0 < x < 0.25) prepared by solid state reaction followed by densification via spark plasma sintering (SPS) were studied. The Ti substitution increased the Seebeck coefficient, the power factor, and decreased both the electronic and lattice thermal conductivity, leading to a significantly high ZT of 0.50 +/- 0.07 at 1073 K for the sample with x = 0.2.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Gui-Cang He, Li-Na Shi, Yi-Lei Hua, Xiao-Li Zhu
Summary: This work investigates the electron-phonon, phonon-phonon, and phonon structure scattering mechanisms and their impact on the thermal and thermoelectric properties of a silver nanowire (AgNW). The study reveals that the electron-phonon scattering rate decreases with increasing temperature, while the phonon-phonon scattering rate increases and surpasses the electron-phonon scattering rate above the Debye temperature. The rate of phonon structure scattering remains constant. The thermal conductivity of the AgNW exhibits an opposite trend to the total phonon scattering rate with temperature. The thermoelectric properties of the AgNW are heavily influenced by the thermal conductivity, and the figure of merit (ZT) of the AgNW is found to be significantly higher than that of bulk silver at room temperature.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Wei-Tsu Peng, Fu-Ren Chen, Ming-Chang Lu
Summary: This study investigated the electrical and thermal properties of copper nanowires (CuNWs), revealing that structural scattering is the predominant mechanism in the electrical current transport and heat transfer in the nanowires. The residual resistivity and electron-phonon coupling parameter were found to increase with the degree of structural scattering. High values of residual unified thermal resistivity and electron-phonon-induced unified thermal resistivity were also discovered in the CuNWs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Darrin Sime Nkemeni, Zhe Yang, Shiyun Lou, Guihui Li, Shaomin Zhou
Summary: The development of nontoxic and inexpensive thermoelectric Cu2S-based materials can increase the application of thermoelectric materials in energy conversion. Doping significantly enhances the electrical conductivity and thermoelectric performance of Cu2S, leading to improved power factor and ZT values in doped Cu2S alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
W. E. Richardson, E. R. Mucciolo, P. K. Schelling
Summary: A realistic tight-binding model was used to study the resistivity size effect on Ru thin films due to steps. The study found that even in the absence of surface steps, certain film orientations exhibit a significant size effect. Further elucidation of the resistivity size effect is needed to fully understand the observed results.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Gabriel Kuderowicz, Bartlomiej Wiendlocha
Summary: In this study, the effect of Ni doping on the electronic structure of ThCoC2 superconductor was investigated using the KKR-CPA method, revealing an increase in the density of states at the Fermi level. The electron-phonon coupling constant lambda was also calculated using the RMTA method, showing an increase in lambda(x). These findings support the assumption of electron-phonon coupling as the pairing mechanism.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Sylwia Gutowska, Bartlomiej Wiendlocha
Summary: We present the band structure of CeIr3 superconductor calculated using DMFT. The standard methods fail to reproduce experimental results, but DMFT study shows a strong hybridization between Ce and Ir, which leads to accurate predictions.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Ajay Kumar Verma, Kishor Kumar Johari, Paritosh Dubey, Durgesh Kumar Sharma, Sudhir Kumar, Sanjay Rangnate Dhakate, Christophe Candolfi, Bertrand Lenoir, Bhasker Gahtori
Summary: Band engineering is successfully applied to enhance the thermoelectric performance of the p-type TiCoSb half-Heusler compound. The convergence of two valence band maxima increases the density-of-states effective mass and leads to an improved Seebeck coefficient. Sn doping and defects, such as point defects, edge dislocations, and nanosized grains, further enhance the power factor and reduce the lattice thermal conductivity. The combination of band convergence and microstructure engineering in TiCoSb is effective in tuning its thermoelectric performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Janina Molenda, Anna Milewska, Wojciech Zajac, Katarzyna Walczak, Marta Wolczko, Anna Komenda, Janusz Tobola
Summary: The research presents the results of studying the NaxTi1/6Mn1/6Fe1/6Co1/6Ni1/6Cu1/6O2 high entropy oxide cathode material for Na-ion batteries, focusing on its structural, transport, and electrochemical properties. The pristine high entropy oxide exhibits semiconducting behavior with one reversible phase transition. Electrochemical tests indicate a significant decrease in capacity in the voltage range of 1.5-3.9 V, while tests in the limited range of 3.2-3.9 V show high cycling stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
Viviana Sousa, Arka Sarkar, Oleg I. Lebedev, Christophe Candolfi, Bertrand Lenoir, Rodrigo Coelho, Antonio P. Goncalves, Eliana M. F. Vieira, Pedro Alpuim, Kirill Kovnir, Yury V. Kolen'ko
Summary: This study presents a simple and effective method for the preparation of solution-processed chalcogenide thermoelectric materials. By using colloidal synthesis and spark plasma sintering, phase-pure chalcogenides with distinct morphologies were obtained. The solution-processed PbTe, PbSe, and SnSe exhibited low thermal conductivity and moderate thermoelectric performance. The findings of this study provide a valuable approach for the design of efficient solution-processed chalcogenide thermoelectrics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Physical
D. Szymanski, R. Zach, J. Tobola, W. Chajec, R. Duraj, L. Gondek, S. Baran, M. Michalec, P. Chaudouet, S. Haj-Khlifa, E. K. Hlil, D. Fruchart
Summary: The crystal structure of the MnRuxRh1-xAs system belongs to the hexagonal Fe2P-type structure with magnetic phase transitions. For x>0.75, the compounds exhibit ferromagnetic ordering, while a drop in Curie temperature is observed with the increase of Rh concentration. In the range of x<0.2, the MnRuxRh1-xAs system undergoes successive antiferromagnetic arrangements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Gabriela K. K. Wazny, Katarzyna Walczak, Janusz Tobola, Michal Rybski, Wojciech Zajac, Pawel Czaja, Marta Wolczko, Justyna Plotek, Janina Molenda
Summary: As the Li-ion batteries market faces challenges in meeting demands, it is necessary to develop post-lithium technologies like Na-ion batteries. This study presents the stabilization of crystal structure in Na0.67MnO2 cathode material through magnesium substitution. The improved structure enhances electronic and ionic conductivity, resulting in an increased capacity.
Article
Chemistry, Physical
Seokyeong Byeon, Bartlomiej Wiendlocha, Johannes de Boor, Kornelius Nielsch, Hyungyu Jin
Summary: In this study, the authors analyze the effect of Mg deficiency on the thermoelectric properties of the Mgx(Si, Sn) system. It is found that Mg deficiency induces point defects and phase separation, which alter the band structure. The measurements and calculations show that Mg deficiency leads to p-type behavior and a lower carrier concentration. Furthermore, Mg deficiency reduces the thermal conductivity and enhances the p-type thermoelectric performance of Mg silicides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Christophe Candolfi, Soufiane El Oualid, Bertrand Lenoir, Thierry Caillat
Summary: The direct conversion of thermal energy into electrical current through thermoelectric effects has applications in radioisotope thermoelectric generators for space missions and waste-heat-harvesting. This Perspective provides an overview of prospective thermoelectric materials and technologies, highlighting recent developments in the fabrication of thermoelectric generators. It also discusses challenges and open questions that need to be addressed for economic and technological viability in everyday-life environments.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Patrick Gougeon, Philippe Gall, Shantanu Misra, Adele Leon, Christine Gendarme, Sylvie Migot, Jaafar Ghanbaja, Soufiane El Oualid, Bertrand Lenoir, Christophe Candolfi
Summary: The influence of Cu on the crystal structures and thermoelectric properties of In2Mo15Se19 and K2Mo15Se19 was investigated, and it was found that inserting Cu can adjust the hole concentration and improve the thermopower. Cu+ cations in Cu3In2Mo15Se19 and Cu3K2Mo15Se19 are distributed differently in crystallographic sites. The structural disorder leads to low lattice thermal conductivity kappa(L). The sensitivity of the electronic and thermal properties to the Cu content is shown in Cu4In2Mo15Se19, which exhibits good thermoelectric performance and high melting point, making it a potential candidate for thermoelectric applications above 1000 K.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Shantanu Misra, Bartlomiej Wiendlocha, Soufiane El Oualid, Anne Dauscher, Bertrand Lenoir, Christophe Candolfi
Summary: This study demonstrates that the thermoelectric performance of Sn1-delta Te can be enhanced by manipulating its valence band structure through band convergence and resonant level. The effects of these two mechanisms can be properly balanced to optimize the ZT values.
JOURNAL OF MATERIALS CHEMISTRY A
(2024)
Article
Materials Science, Multidisciplinary
Ajay Kumar Verma, Shamma Jain, Kishor Kumar Johari, Christophe Candolfi, Bertrand Lenoir, Sumeet Walia, S. R. Dhakate, Bhasker Gahtori
Summary: This study demonstrates a multi-alloying approach to reduce the lattice thermal conductivity of Half-Heusler alloys. By creating large point defects through heavy isovalent substitution, the enhanced point defect phonon scattering effectively lowers the lattice thermal conductivity.
MATERIALS ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Shantanu Misra, Bartlomiej Wiendlocha, Janusz Tobola, Petr Levinsky, Jiri Hejtmanek, Sylvie Migot, Jaafar Ghanbaja, Anne Dauscher, Bertrand Lenoir, Christophe Candolfi
Summary: The study investigates the normal-state transport properties and superconductivity of the Sn1.03-delta-xInxTe alloy. It finds that the distortion of the valence-band structure by the In-induced resonant level has a profound influence on the material's properties and the emergence of superconductivity.
Article
Materials Science, Multidisciplinary
Gabriel Kuderowicz, Pawel Wojcik, Bartlomiej Wiendlocha
Summary: In this study, the electronic structure, phonons, electron-phonon coupling, and superconductivity of the noncentrosymmetric superconductor ThCoC2 were theoretically investigated as a function of pressure. The results showed that pressure can enhance the electronic band splitting induced by spin-orbit coupling and increase the electron-phonon coupling constant Λ despite the overall stiffening of the crystal lattice. Furthermore, simulation results using the isotropic Eliashberg electron-phonon coupling theory revealed that the critical temperature Tc significantly increased with the increase in Λ, offering a chance to resolve the pairing mechanism in ThCoC2.
