Article
Materials Science, Multidisciplinary
Hong-Xia Liu, Xin-Yue Zhang, Zhong-Lin Bu, Wen Li, Yan-Zhong Pei
Summary: The research focuses on the systematic investigation of the thermoelectric properties of (GeTe)(1-x)[(Ag2Te)(0.4)(Sb2Te3)(0.6)](x) alloys, discovering that increasing the value of x in the alloy can enhance the Seebeck coefficient but reduce the Hall mobility. Furthermore, additional phonon scattering caused by point defects can lower the lattice thermal conductivity, thereby improving thermoelectric efficiency.
Article
Chemistry, Inorganic & Nuclear
Kasey P. Devlin, Shunda Chen, Davide Donadio, Susan M. Kauzlarich
Summary: Solid solutions of Yb(2-x)A(x)CdSb(2) (A = Ca, Sr, Eu; x <= 1) exhibit different crystal structures, with structural transitions occurring with increased Ca content, impacting thermoelectric properties.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Ceramics
Yang Xiao, Su Xianli, Yan Yonggao, Tang Xinfeng
Summary: Doping with Bi2Te3 intensifies the phonon scattering and reduces the lattice thermal conductivities of GeTe-Bi2Te3 compounds; The effective mass is enhanced through adjustment of the relative amount of Bi2Te3 and GeTe; Even at high carrier concentration, these compounds maintain superior Seebeck coefficient and power factor.
JOURNAL OF INORGANIC MATERIALS
(2021)
Article
Chemistry, Physical
Yuyang Huang, Zan Yang, Yu-Chih Tseng, Evan Smith, Yurij Mozharivskyj
Summary: ZnO nanoparticles were incorporated into GeTe samples, which unexpectedly reacted with the GeTe phase to produce ZnTe and Ge impurities. The reaction promoted self compensation in GeTe, reduced the carrier concentration, and increased the Seebeck coefficient and power factor. Moreover, the irreversibility of the reaction between GeTe and ZnO during high-temperature thermoelectric measurements highlighted the importance of the proper sequence for property measurements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Environmental
Wan-Yu Lyu, Wei-Di Liu, Meng Li, Min Hong, Kai Guo, Jun Luo, Juanjuan Xing, Qiang Sun, Shengduo Xu, Jin Zou, Zhi-Gang Chen
Summary: This study comprehensively investigates the effect of rare earth element substitutions on the thermoelectric performance of GeTe. It is found that rare earth element substitutions enhance the Seebeck coefficient, reduce lattice thermal conductivity, and improve the dimensionless figure of merit. These findings indicate that rare earth elements can be effective dopants in GeTe to enhance its thermoelectric properties.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Hisao Nakamura
Summary: The thermoelectric and thermal properties of an interfacial phase-change memory (iPCM) device using (GeTe)(2)/Sb2Te3 superlattice as the resistive switching layer were investigated. The study suggested that doping or charge trapping can enhance the difference in thermoelectric properties and electric resistance contrast. Among the different structures examined, the KH structure showed the lowest thermal conductance and significant effect of phonon-phonon scattering.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Chemistry, Physical
Yilun Huang, Shizhen Zhi, Shengnan Zhang, Wenqing Yao, Weiqin Ao, Chaohua Zhang, Fusheng Liu, Junqin Li, Lipeng Hu
Summary: Entropy engineering is introduced as a paradigm-shifting strategy in thermoelectrics, where optimizing alloy composition design to enhance the thermoelectric performance of GeTe-based alloys by increasing configurational entropy, reducing carrier concentration, and ultimately achieving a higher Seebeck coefficient.
Article
Nanoscience & Nanotechnology
Yutian Wu, Xianli Su, Dongwang Yang, Qingjie Zhang, Xinfeng Tang
Summary: AgBi3S5 is an environmentally friendly n-type thermoelectric material, but its poor electrical properties limit its overall performance. Configurational entropy engineering can effectively decrease thermal conductivity and enhance electrical transport properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Amelie Galode, Tristan Barbier, Franck Gascoin
Summary: Commercial Peltier cooling devices and thermoelectric generators commonly use bismuth telluride-based materials with selenium-containing n-type legs. In this study, we investigate the feasibility of a selenium-free n-type (Bi, Sb)(2)Te-3 using a simple two-step process: mechanical alloying synthesis followed by spark plasma sintering. The results show that increasing the Sb content can reduce the band gap and an edge-free sintering process considerably improves thermoelectric performance.
Article
Chemistry, Physical
Noppanut Daichakomphu, Suman Abbas, Ta-Lei Chou, Li-Chyong Chen, Kuei-Hsien Chen, Aparporn Sakulkalavek, Rachsak Sakdanuphab
Summary: The sputtering pressure significantly affects the thermoelectric properties and crystalline structure of GeTe films. Increasing pressure leads to a transition in surface morphology from cracks to voids. Optimizing the thermoelectric performance of GeTe thin films can be achieved by controlling the working pressures and film thickness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Zhihua Tian, Peigen Zhang, Wenwen Sun, Bingzhen Yan, Zhengming Sun
Summary: The achievement of chemical diversity and performance regulation of MAX phases primarily relies on solid solution approaches. In this study，high-purity Ti-2(SnxAl(1-x))C solid solution was synthesized by pressureless sintering. The deviation from Vegard's law in A-site solid solution was explored, and the enhanced performance of the solid solution was observed.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Physics, Applied
Chao Chen, Chong Qiao, Ming Xu, Xiangshui Miao
Summary: The dielectric properties of amorphous Ge8Sb2Te11 thin films were systematically investigated in this study. It was found that the static dielectric constant increased linearly with temperature, while showing little dependence on frequency. Moreover, the calculated bandgap was larger than that measured from optical absorption.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jinxuan Zhong, Gege Liang, Jiahui Cheng, Weiqin Ao, Chaohua Zhang, Junqin Li, Fusheng Liu, Shengnan Zhang, Lipeng Hu
Summary: As an emerging fingerprint factor in the material genome, entropy plays a vital role in enhancing the thermoelectric performance of multicomponent materials. The lattice thermal conductivity can be reduced, and the Seebeck coefficient can be improved through severe lattice distortion and crystal symmetry enhancement. However, high entropy hinders the improvement of carrier mobility, which is crucial for enhancing the dimensionless figure of merit (zT).
SCIENCE CHINA-MATERIALS
(2023)
Article
Materials Science, Ceramics
Mohamed Aissa, Moneim Zannen, Mohammed Hadouchi, Hend Kacem, Jamal Belhadi, Hassan A. H. Alzahrani, Abdallah Aissa, Mimoun El Marssi, Mustapha Majdoub, Abdelilah Lahmar
Summary: The correlation between the phase structure, dielectric, and ferroelectric properties of lead-free polycrystalline ceramics was investigated. The crystallographic transformation, dielectric diffuseness, depolarization temperature, and lattice disorder were analyzed. Raman spectroscopy and I-E loops were used to study the composition-dependent behavior and phase transition.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Stefan Schwarzmueller, Daniel Souchay, Gerald Wagner, Paul Kemmesies, Daniel Guenther, Michael Bittner, Guanhua Zhang, Zefeng Ren, Armin Feldhoff, G. Jeffrey Snyder, Oliver Oeckler
Summary: In this study, it was demonstrated that a new composite material can be formed by adding copper and doping material to a specific composition of copper germanium antimony tellurides. The composite material exhibits superior thermoelectric properties suitable for temperature-dependent applications. Furthermore, strategies such as optimizing grain boundaries and temperature-induced microstructure reset were proposed to overcome material degradation during electrical current application.
CHEMISTRY OF MATERIALS
(2022)
