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Journal of Semiconductors 2011年第7期32卷 9-13页

作者：陈瑞雪孟庆森樊文浩王忠 College of material Science and Engineering Taiyuan University of Technology General Research Institute for Nonferrous Metals

（Bi_2Te_3）_（0.2）（Sb_2Te_3）_（0.8） thermoelectric material was sintered via a field activated and pressure assisted sintering（FAPAS） *** applying different current intensity（0,60,320 A/cm^2） in the sintering process,the effects of electric current on the microstructure and thermoelectric performance were *** demonstrated that the application of electric current in the sintering process could significantly improve the uniformity and density of（Bi_2Te_3）_（0.2）（Sb_2Te_3）_（0.8） *** the current intensity was raised to 320 A/cm^2,the preferred orientation of grains was ***,positive effects on the thermoelectric performance of applying electric current in the sintering process were also *** increase of 0.02 and 0.11 in the maximum figure of merit ZT value could be acquired by applying current of 60 and 320 A/cm^2,respectively.

关键词： thermoelectric material (Bi_2Te_3)_(0.2)(Sb_2Te_3)_(0.8) microstructure performance current field activated and pressure assisted sintering

thermoelectric field for a coated hole of arbitrary shape in a nonlinearly coupled thermoelectric material

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Applied Mathematics and Mechanics(English Edition) 2022年第11期43卷 1691-1700页

作者： Xu WANG P.SCHIAVONE School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Department of Mechanical Engineering University of Alberta10-203 Donadeo Innovation Center for EngineeringEdmonton T6G 1H9Canada

We study the thermoelectric field for an electrically and thermally insulated coated hole of arbitrary shape embedded in an infinite nonlinearly coupled thermoelectric material subject to uniform remote electric current density and uniform remote energy flux.A conformal mapping function for the coating and matrix is introduced,which simultaneously maps the hole boundary and the coating-matrix interface onto two concentric circles in the image *** analytic continuation,we derive a general solution in terms of two auxiliary *** general solution satisfies the insulating conditions along the hole boundary and all of the continuity conditions across the perfect coating-matrix *** the two auxiliary functions have been obtained in the elementary-form,the four original analytic functions in the coating and matrix characterizing the thermoelectric fields are completely and explicitly *** design of a neutral coated circular hole that does not disturb the prescribed thermoelectric field in the thermoelectric matrix is achieved when the relative thickness parameter and the two mismatch parameters satisfy a simple ***,the neutrality of a coated circular thermoelectric inhomogeneity is also accomplished.

关键词： thermoelectric material nonlinear coupling coated hole of arbitrary shape complex variable method analytic solution neutral coated hole

Grain size and structure distortion characterization of α-MgAgSb thermoelectric material by powder diffraction

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Chinese Physics B 2020年第10期29卷 388-391页

作者： Xiyang Li Zhigang Zhang Lunhua He Maxim Avdeev Yang Ren Huaizhou Zhao Fangwei Wang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 101408China Songshan Lake materials Laboratory Dongguan 523808China Australian Nuclear Science and Technology Organisation Lucas HeightsNSW 2234Australia X-ray Science Division Argonne National LaboratoryArgonneIL 60439USA

Nanostructuring, structure distortion, and/or disorder are the main manipulation techniques to reduce the lattice thermal conductivity and improve the figure of merit of thermoelectric materials. A single-phase α-MgAgSb sample, MgAg0.97Sb0.99, with high thermoelectric performance in near room temperature region was synthesized through a high-energy ball milling with a hot-pressing method. Here, we report the average grain size of 24–28 nm and the accurate structure distortion, which are characterized by high-resolution neutron diffraction and synchrotron x-ray diffraction with Rietveld refinement data analysis. Both the small grain size and the structure distortion have a contribution to the low lattice thermal conductivity in MgAg0.97Sb0.99.

关键词： diffraction grain size structure distortion thermoelectric material

Surface contact behavior of functionally graded thermoelectric materials indented by a conducting punch

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Applied Mathematics and Mechanics(English Edition) 2021年第5期42卷 649-664页

作者： Xiaojuan TIAN Yueting ZHOU Lihua WANG Shenghu DING School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China School of Mathematics and Statistics Ningxia UniversityYinchuan 750021China

The contact problem for thermoelectric materials with functionally graded properties is *** material properties,such as the electric conductivity,the thermal conductivity,the shear modulus,and the thermal expansion coefficient,vary in an exponential *** the Fourier transform technique,the electro-thermoelastic problems are transformed into three sets of singular integral equations which are solved numerically in terms of the unknown normal electric current density,the normal energy flux,and the contact ***,the complex homogeneous solutions of the displacement fields caused by the gradient parameters are simplified with the help of Euler’s *** addressing the non-linearity excited by thermoelectric effects,the particular solutions of the displacement fields can be *** effects of various combinations of material gradient parameters and thermoelectric loads on the contact behaviors of thermoelectric materials are *** results give a deep insight into the contact damage mechanism of functionally graded thermoelectric materials(FGTEMs).

关键词： thermoelectric material functionally graded property conducting punch conjugate complex root energy flux contact pressure

Ultrahigh electrical conductivities and low lattice thermal conductivities of La,Dy,and Nb Co-doped SrTiO3 thermoelectric materials with complex structures

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Journal of materials Science & Technology 2020年第17期52卷 172-179页

作者： Daquan Liu Yanxia Wang Xue Jiang Huijun Kang Xiong Yang Xiaoying Zhang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Key Laboratory of material Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian116024China

Microstructural modifications and appropriate element doping are necessary to simultaneously enhance the electrical conductivities and reduce the lattice thermal conductivities of thermoelectric ***,we propose a strategy of multielement doping combined with a burial sintering process to promote thermoelectric ***-element doped Sr0.9La0.05Dy0.05Ti1-xNbxO3(x=0,0.05,0.10,0.15,and 0.20)powders were synthesized by high-energy ball milling,and corresponding bulk samples were prepared by carbon burial *** the bulk samples,we obtained the desired microstructures composed of shell-vesicular architectures with dense dislocations and second phase *** materials had ultrahigh electrical conductivities(~5300 S cm^-1 at 300 K),low lattice thermal conductivities(~1.6 Wm^-1 K^-1 from 700 to 1100 K when x=0.2)and low total thermal conductivities(minimum value of 2.95 Wm^-1 K^-1 when x=0.05 at 1100 K).The maximum zT values were 0.28 when x=0.05 and 0.27 when x=0.2 at 1100 *** strategy provides a possible direction for improving the thermoelectric properties of SrTiO3 based materials.

关键词： Strontium titanate Mechanical alloying thermoelectric material Dense dislocation Sintering process

Self-Healable and Stretchable PAAc/XG/Bi_(2)Se_(0.3)Te_(2.7) Hybrid Hydrogel thermoelectric materials

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Energy & Environmental materials 2024年第2期7卷 180-186页

作者： Jinmeng Li Tian Xu Zheng Ma Wang Li Yongxin Qian Yang Tao Yinchao Wei Qinghui Jiang Yubo Luo Junyou Yang State Key Laboratory of materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

thermoelectric power generators have attracted increasing interest in recent years owing to their great potential in wearable electronics power *** is noted that thermoelectric power generators are easy to damage in the dynamic service process,resulting in the formation of microcracks and performance ***,we prepare a new hybrid hydrogel thermoelectric material PAAc/XG/Bi_(2)Se_(0.3)Te_(2.7)by an in situ polymerization method,which shows a high stretchable and self-healable performance,as well as a good thermoelectric *** the sample with Bi_(2)Se_(0.3)Te_(2.7)content of 1.5 wt%(i.e.,PAAc/XG/Bi2Se0.3Te27(1.5 wt%)),which has a room temperature Seebeck coefficient of-0.45 mV K^(-1),and exhibits an open-circuit voltage of-17.91 mV and output power of 38.1 nW at a temperature difference of 40 *** being completely cut off,the hybrid thermoelectric hydrogel automatically recovers its electrical characteristics within a response time of 2.0 s,and the healed hydrogel remains more than 99%of its initial power *** stretchable and self-healable hybrid hydrogel thermoelectric materials show promising potential for application in dynamic service conditions,such as wearable electronics.

关键词： bismuth telluride self healing thermoelectric material

thermoelectric properties of BiSb_x (x=0.6-0.8) thermoelectric materials fabricated by different processing

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Journal of University of Science and Technology Beijing 2003年第2期10卷 65-67页

作者： Guiying Xu, Zhangjian Zhou, Sitong Niu, and Jianqiang LiuLaboratory of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, Beijing 100083, China Univ Sci & Technol Beijing Lab Special Ceram & Powder Met Beijing 100083 Peoples R China

In order to improve the thermoelectric properties, hot-pressing sintering andultra high pressure sintering methods were adopted to fabricate BiSb_x. The phase and crystalstructures were determined by X-ray diffraction analysis (XRD). The thermoelectric properties weremeasured at 303 K along the direction parallel to the pressing direction. The electric conductivityof the samples was measured at 303 K by the four-probe technique. To measure the Seebeckcoefficient, heat was applied to the samples placed between two Cu discs. The thermoelectricelectromotive force (E) was measured upon applying small temperature differences (DELTA Tthermoelectric properties of the samplesfabricated by UHPS (ultra high pressure sintering) method are much higher than that by HPS (hotpressing sintering) method and have the highest values at x=0.7.

关键词： thermoelectric property thermoelectric material ultra high pressuresintering BiSb_x

Thermal stability and thermoelectric properties of Cd-doped nano-layered Cu2Se prepared using NaCl flux method

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Chinese Physics B 2020年第12期29卷 455-462页

作者： Jianhua Lu Decong Li Wenting Liu Lanxian Shen Jiali Chen Wen Ge Shukang Deng Education Ministry Key Laboratory of Renewable Energy Advanced materials and Manufacturing Technology Yunnan Normal UniversityKunming 650500China Photoelectric Engineering College Yunnan Open UniversityKunming 650500China

Cu2Se is a promising"phonon liquid-electron crystal"thermoelectric material with excellent thermoelectric *** this work,Cd-doped Cu2-xSeCdx(x=0,0.0075,0.01,and 0.02)samples were prepared using NaCl flux *** solubility of Cd in Cu2Se at room temperature was less than 6%,and a second phase of CdSe was found in the samples with large initial Cd content(x=0.01 and 0.02).Field-emission scanning electron microscopic image showed that the arranged lamellae formed a large-scale layered structure with an average thickness of approximately 100 *** electron microscopy demonstrated that doping of Cd atoms did not destroy the crystal integrity of Cu2Se.A small amount of Cd in Cu2Se could reduce the electrical and thermal conductivities of the material,thus significantly enhancing its thermoelectric *** the increase in Cd content in the sample,the carrier concentration decreased and the mobility increased *** differential thermal analysis showed that no weight loss occurred below the melting *** Cd doping led to the emergence of the second phase of CdSe in the sample,thus significantly increasing the thermal conductivity of the material.A maximum ZT value of 1.67 at 700 K was obtained in the Cu1.9925SeCd0.0075 sample.

关键词： thermoelectric material Cu2Se doping and second phase NaCl flux thermoelectric transfer performance

Enhanced thermoelectric performance in n-type Mg_(3.2)Sb_(1.5)Bi_(0.5) doping with lanthanides at the Mg site

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Journal of materials Science & Technology 2022年第32期127卷 108-114页

作者： Lu Yu Zipei Zhang Juan Li Wenhao Li Shikai Wei Sitong Wei Guiwu Lu Weiyu Song Shuqi Zheng State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of PetroleumBeijing 102249China College of Science China University of PetroleumBeijing 102249China

Mg-based thermoelectric materials have attracted more and more attention because of their rich composition elements,green environmental protection,and lower *** recent years,the thermoelectric properties of n-type Mg_(3)Sb_(2) materials have been optimized by doping chalcogenide elements(S,Se,and Te)at the anionic *** this work,n-type Mg_(3.2)A_(x)Sb_(1.5)Bi_(0.5)(A=Gd,Ho;x=0.01,0.02,0.03,and 0.4)samples were prepared by the cation site doping of lanthanide elements(Gd and Ho).The research results show that Gd and Ho doped n-type Mg3.2Sb1.5Bi0.5samples are entirely comparable to the S,Se,and Te doped n-type Mg3.2Sb1.5Bi0.5samples,demonstrating more excellent thermoelectric *** with lanthanides(Gd and Ho)at the Mg site increases the carrier concentration of the material to 8.161×10^(19)cm^(-3).Doping induces the contribution of more electron,thus obtaining higher *** maximum zT value of the Mg_(3.2)Gd_(0.02)Sb_(1.5)Bi_(0.5) and the Mg_(3.2)Ho_(0.02)Sb_(1.5)Bi_(0.5) samples reaches 1.61 and 1.55,*** work theoretically and experimentally demonstrates Gd and Ho are efficient n-type dopants for Mg_(3.2)Sb_(1.5)Bi_(0.5) thermoelectric material.

关键词： thermoelectric material First-principles calculation Mg_(3.2)Sb_(1.5)Bi_(0.5)

Improving compatibility between thermoelectric components through current refraction

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Chinese Physics B 2018年第7期27卷 486-491页

作者：宋坤宋豪鹏高存法 State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics & Astronautics

It is well known that components with dissimilar compatibility factors cannot be combined by segmentation into an efficient thermoelectric generator, since each component needs a unique optimal current density. Based on the complex variable method, the thermal-electric field within a hi-layered thermoelectric composite has been analyzed, and the field distributions have been obtained in closed-form. Our analysis shows that current refraction occurs at the interface, both the refraction angle and current density vary with the incidence angle. Further analysis proves that the current densities in two components can be adjusted independently by adjusting the incidence current density and incidence angle, thus the optimal current density can be matched in both components, and the conversion efficiency can be significantly increased. These results point to a new route for high efficiency thermoelectric composites.

关键词： thermoelectric material current refraction compatibility factor conversion efficiency