A sound velocity method for determining isobaric specific heat capacity  

作　　者：Jun Pei Hezhang Li Hua-Lu Zhuang Jinfeng Dong Bowen Cai Haihua Hu Jing-Wei Li Yilin Jiang Bin Su Li-Dong Zhao Jing-Feng Li 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of M aterials Science and Engineering,Tsinghua University,Beijng,People's Republic of China [2]National Institute for Materials Science(NIMS),Tsukuba,Japan [3]Schoo of Materials Science and Engineering,Beihang University,Bejing,People's Republic of China

出　　处：《InfoMat》2022年第12期103-111,共9页信息材料（英文）

基　　金：Basic Science Center Project of NSFC,Grant/Award Number:51788104;National Key R&D Program of China,Grant/Award Number:2018YFB0703603。

摘　　要：Isobaric specific heat capacity(Cp)is an important parameter not only in physics but also for most materials.Its accurate measurement is particularly critical for performance evaluation of thermoelectric materials,but the experiments by differential scanning calorimetry(DSC)often lead to large uncertainties in the measurements,especially at elevated temperatures.In this study,we propose a simple method to determine Cp by measuring the sound velocity(υ)based on lattice vibration and expansion theory.The relative standard error of theυis smaller than 1%,showing good accuracy and repeatability.The calculated Cp at elevated temperature(>300 K)increases slightly with increasing temperature due to the lattice expansion,which is more reasonable than the Dulong–Petit value.

关 键 词：heat capacity sound velocity THERMOELECTRIC 

分 类 号：O57[理学—粒子物理与原子核物理]