典型文献
Se-alloying reducing lattice thermal conductivity of Geo.95Bio.05Te
文献摘要：
High lattice thermal conductivity of intrinsic GeTe limits the wide application of GeTe-based thermo-electrics.Recently,the optimization of GeTe-based thermoelectric materials has been focusing on re-ducing lattice thermal conductivity via strengthening phonon scattering.In this study,we systematically studied thermoelectric properties of Se-alloyed Ge0.95Bi0.05Te via theoretical calculations,structural char-acterizations,and performance evaluations.Our results indicate that Se-alloying can induce dense point defects with mass/strain-field fluctuations and correspondingly enhance point defect phonon scattering of the Ge0.95Bi0.05Te matrix.Se-alloying might also change chemical bonding strength to introduce resonant states in the base frequency of Ge0.95Bi0.05Te matrix,which can strengthen Umklapp phonon scattering.Finally,a decreased lattice thermal conductivity from～1.02 W m-1 K-1 to～0.65 W mr1 K-1 at 723 K is obtained in Ge0.95Bi0.05Te1-xSex pellets with increasing the Se content from 0 to 0.3.A peak figure of merit of～1.6 at 723 K is achieved in Ge0.95Bi0.05Te0.7Se0.3 pellet,which is～77％higher than that of pris-tine GeTe.This study extends the understanding on the thermoelectric performance of GeTe.
文献关键词：
中图分类号：
作者姓名：
De-Zhuang Wang;Wei-Di Liu;Xiao-Lei Shi;Han Gao;Hao Wu;Liang-Cao Yin;Yuewen Zhang;Yifeng Wang;Xueping Wu;Qingfeng Liu;Zhi-Gang Chen
作者机构：
State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing,211800,China;Centre for Future Materials,University of Southern Queensland,Springfield Central,QLD 4300,Australia;School of Mechanical and Mining Engineering,The University of Queensland,Brisbane,QLD 4072,Australia;Key Laboratory of Material Physics of Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou,450052,China;College of Materials science and engineering,Nanjing Tech University,Nanjing,211800,China;School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei,230009,China;CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,030001,China
文献出处：
引用格式：
[1]De-Zhuang Wang;Wei-Di Liu;Xiao-Lei Shi;Han Gao;Hao Wu;Liang-Cao Yin;Yuewen Zhang;Yifeng Wang;Xueping Wu;Qingfeng Liu;Zhi-Gang Chen-.Se-alloying reducing lattice thermal conductivity of Geo.95Bio.05Te)[J].材料科学技术（英文版）,2022(11):249-256
A类：
95Bio,05Te,electrics,95Bi0,Umklapp,mr1,05Te1,05Te0,7Se0,pris
B类：
alloying,reducing,lattice,thermal,conductivity,Geo,High,intrinsic,GeTe,limits,wide,application,Recently,optimization,thermoelectric,materials,has,been,focusing,via,strengthening,phonon,scattering,In,this,study,we,systematically,studied,properties,alloyed,Ge0,theoretical,calculations,structural,char,acterizations,performance,evaluations,Our,results,indicate,that,can,induce,dense,point,defects,mass,strain,field,fluctuations,correspondingly,enhance,matrix,might,also,change,chemical,bonding,introduce,resonant,states,frequency,which,Finally,decreased,from,obtained,xSex,pellets,increasing,content,peak,figure,merit,achieved,higher,than,tine,This,extends,understanding
AB值：
0.441531
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