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一、引言迄今,在高压环境中测温的主要手段仍然是热电偶.由于热电偶尺寸小,结实,操作方便,测温精确度高,工作温度范围广,因而被广泛采用.但是,在高压环境中,热电偶自身也遭受高压.高压使热电偶的原子间距减小,从而使费米能增高,能带结构和费米面都发生变化;声子频谱、声子-电子相互作用也发生变化.结果热电偶材料的热电特性和其它许多物性也随着发生显著变化.在许多高压实验中,由于压力的影响十分显著,必须进行修正,才能得到正确的结果.
I. INTRODUCTION So far, the main measure of temperature in high-pressure environment is still the thermocouple, which is widely used due to its small size, robustness, convenient operation, high temperature measurement accuracy and wide operating temperature range. However, In the environment, the thermocouple itself is also subject to high pressure. High pressure reduces the atomic spacing of the thermocouple, thereby increasing the Fermi energy, both the band structure and the Fermi surface; phonon spectrum, phonon-electron interaction also changes Results The thermoelectric properties and many other physical properties of thermocouple materials also vary significantly with them, and in many high-pressure experiments, the effect of pressure is significant and must be corrected to get the correct result.