标题:
钛酸锶的热传导研究Thermal Conductivity Studies of SrTiO3
作者:
李宁, 王惠琼, 张宇锋, 黄政, 任飞, 郑金成
关键字:
钛酸锶, 氧缺陷, 热传导, 德拜模型SrTiO3, Oxygen Vacancies, Thermal Conductivity, Debye Model
期刊名称:
《Material Sciences》, Vol.4 No.3, 2014-05-13
摘要:
为了研究氧缺陷对钛酸锶热传导过程的影响，利用高温高真空条件下对钛酸锶进行退火，用高温型差示扫描量热仪测出单晶钛酸锶退火前后钛酸锶的比热，利用激光导热仪测出它们的热扩散系数，计算出它们的热导率，比较它们之间的差异。之后结合德拜模型分析退火前后出现差异及比热和热导随温度变化的原因。通过理论分析和实验相结合，得知钛酸锶在退火后产生氧缺陷，有效地降低了钛酸锶的热导，并进一步验证了钛酸锶的热导性质符合德拜模型。
In order to study the influence of oxygen vacancies in SrTiO3 on its thermal conductivity, SrTiO3 single crystals were annealed in high temperature under vacuum. The thermal conductivities of the as-received and annealed samples were determined by measuring their specific heat Cp of the samples using Differential Scanning Calorimetry (DSC) and their thermal diffusivities using Laser Flash Apparatus (LFA). The analysis showed that oxygen vacancies were generated during annealing which led to lower thermal conductivity, and the thermal conductivity properties of SrTiO3 conformed to the Debye model.