纳米氧化铈掺杂对0.675CaTiO_3-0.325LaAlO_3陶瓷热导率的影响

Effect of CeO_2 nanoparticles doping on the thermal conductivity of 0.675CaTiO_3-0.325LaAlO_3 ceramics

采用传统固相反应法制备纳米氧化铈CeO_2掺杂的0.675CaTiO_3-0.325LaAlO_3(CTLA)微波介质陶瓷,研究纳米氧化铈掺杂对陶瓷物相、微观结构、热导率和比热的影响.实验结果表明,掺杂纳米氧化铈能显著提高陶瓷样品热导率.随着掺杂量增加,热导率先增大后减小,当纳米氧化铈CeO_2掺杂量的质量分数为2.0%时,陶瓷的热导率最高,在室温21℃下达到8.68 W/m·℃,大于纯组分陶瓷样品的热导率最大值5.99 W/m·℃.实验结果同时验证CTLA陶瓷热导与比热性质符合德拜模型.

0. 675CaTiO3-0. 325LaAlO3（ CTLA） microwave dielectric ceramics with CeO2 nanoparticles were prepared by traditional solid state process. The crystal structure,microstructure thermal conductivity and specific heat of the prepared ceramics were investigated. The results showed CeO2 nanoparticles can enhance thermal conductivity markedly. With the increasing of Ce O2 content,thermal conductivity increases initially and decreases afterwards. As the amount is 2%,the thermal conductivity is up to maximum,8. 68 W/m·℃ at ambient temperature（ 21 ℃）,which is greater than the maximum of pure components,5. 99 W/m·℃,and the results verified the thermal conductivity and specific heat properties conformed to the Debye model.