A round robin test of the uncertainty on the measurement of the thermoelectric dimensionless figure of merit of Co0.97Ni0.03Sb3
A round robin test of the uncertainty on the measurement of the thermoelectric dimensionless figure of merit of Co0.97Ni0.03Sb3
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DOI：
10.1063/1.4905250
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发表时间：
2015-01-01
影响因子：
1.6
通讯作者：
Soulier, M.
中科院分区：
文献类型：
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作者：
Alleno, E.;Berardan, D.;Soulier, M.
一组欧洲(主要是法国)实验室(实验室)进行了一项旨在测量高温热电性能的循环测试。用Seebeck系数(8个实验室)、电阻率(9个实验室)、热扩散系数(6个实验室)、质量体积密度(6个实验室)和比热(6个实验室)对多晶方解石Co0.97Ni0.03Sb3进行了表征。对这些数据进行了统计处理，以确定作为温度函数的所有这些测量量的不确定度，并结合得到关于导热系数(热扩散系数与密度和比热的乘积)和热电优值系数ZT的总体不确定度。所有这些不确定性都随着温度的升高而增加，这与当温度升高时测量这些量的难度越来越大是一致的。电阻率和热扩散率的不确定性很可能是由样品尺寸的不确定性主导的。在68%的置信度水平下，温度平均(300-700K)的相对标准不确定度分别为塞贝克系数、电阻率、热导率和优值系数ZT的6%、8%、11%和19%。热导率测量似乎是最不准确的。在Co0.97Ni0.03Sb3作为高温标准n型热电材料的建立过程中，温度平均相对扩展不确定度(置信度为95%)的中值ZT的平均值为17%是必不可少的。(C)2015 AIP出版有限责任公司。
A round robin test aiming at measuring the high-temperature thermoelectric properties was carried out by a group of European (mainly French) laboratories (labs). Polycrystalline skutterudite Co0.97Ni0.03Sb3 was characterized by Seebeck coefficient (8 labs), electrical resistivity (9 labs), thermal diffusivity (6 labs), mass volume density (6 labs), and specific heat (6 labs) measurements. These data were statistically processed to determine the uncertainty on all these measured quantities as a function of temperature and combined to obtain an overall uncertainty on the thermal conductivity (product of thermal diffusivity by density and by specific heat) and on the thermoelectric figure of merit ZT. An increase with temperature of all these uncertainties is observed, in agreement with growing difficulties to measure these quantities when temperature increases. The uncertainties on the electrical resistivity and thermal diffusivity are most likely dominated by the uncertainty on the sample dimensions. The temperature-averaged (300-700 K) relative standard uncertainties at the confidence level of 68% amount to 6%, 8%, 11%, and 19% for the Seebeck coefficient, electrical resistivity, thermal conductivity, and figure of merit ZT, respectively. Thermal conductivity measurements appear as the least accurate. The moderate value of the temperature-averaged relative expanded (confidence level of 95%) uncertainty of 17% on the mean of ZT is essential in establishing Co0.97Ni0.03Sb3 as a high temperature standard n-type thermoelectric material. (C) 2015 AIP Publishing LLC.