Creep behavior and post-creep thermoelectric performance of the n-type Skutterudite alloy Yb_(0.3)Co_(4)Sb_(12)  

作　　者：Muath M.Al Malki Xun Shi Pengfei Qiu G.Jeffrey Snyder David C.Dunand 

机构地区：[1]Department of Materials Science&Engineering,Northwestern University,Evanston,IL,60208,USA [2]Mechanical Engineering Department,King Fahd University of Petroleum and Minerals,Dhahran,31261,Saudi Arabia [3]State Key Laboratory of High-Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,200050,China

出　　处：《Journal of Materiomics》2021年第1期89-97,共9页无机材料学学报（英文）

基　　金：supported by the NASA Science Missions Directorate’s Radioisotope Power Systems Technology Advancement Program.This work made use of the MatCI Facility which receives support from the MRSEC Program(NSF DMR-1720139)of the Materials Research Center at Northwestern University.This work made use,as well,of the EPIC facility of Northwestern University’s NUANCE Center,which has received support from the Soft and Hybrid Nanotechnology Experimental(SHyNE)Resource(NSF ECCS-1542205);the MRSEC program(NSF DMR-1720139)at the Materials Research Center;the International Institute for Nanotechnology(IIN);the Keck Foundation;the State of Illinois,through the IIN.This work also made use of the IMSERC at Northwestern University,which has received support from the Soft and Hybrid Nanotechnology Experimental(SHyNE)Resource(NSF ECCS-1542205);the State of Illinois and International Institute for Nanotechnology(IIN).GJS Acknowledges support from the NASA Science Mission Directorate’s Radioisotope Power Systems Thermoelectric Technology Development program.

摘　　要：Upon uniaxial compressive loading at 500℃(T/Tm=0.67,where Tm is the absolute melting point),the n-type Skutterudite alloy Yb03Co4Sb12 deforms plastically by creep via a power-law,with a stress exponent~3 consistent with dislocation viscous glide.An activation energy of 171 kJ/mol is measured over the temperature range of 500-587℃(T/Tm=0.67-0.75)at a stress of 30 MPa.Yb_(0.3)Co_(4)Sb_(12)is ductile at 500℃,exhibiting a compressive strain of 25%when subjected to stresses ranging from 22 to 90 MPa for up to 28 days.Among the thermoelectric materials tested so far for creep,Yb_(0.3)Co_(4)Sb_(12)exhibits a creep resistance intermediate between low-melting(Bi2Te3,TAGS-85)and high-melting thermoelectrics(Mg2Si and ZrNiSn).A relatively modest drop in the figure of merit zT,from 0.67 to 0.52,is displayed by Yb_(0.3)Co_(4)Sb_(12)after accumulating 3.7%compressive creep strain at 500℃,mostly due to a drop in electrical conductivity.

关 键 词：Filled Skutterudite CoSb_(3) Seebeck coefficient Electrical conductivity CREEP 

分 类 号：TG139[一般工业技术—材料科学与工程]