摘要
摘要:采用溶胶-凝胶法合成(La1-xSrx)2Ce2O7-x系列组分样品.研究结果表明:当Sr的掺杂量(戈)小于10%时,(La1-xSrx)2Ce2O7-x系列组分样品都是缺陷萤石结构.随着温度的升高,样品的热膨胀系数(TEC)增大,而热导率(TC)呈减小趋势.在一定温度下,((La1-xSrx)2Ce2O7-x的TEC随z的增大而增大;当Sr掺杂量x在0—7.5%之间增加时,样品的热导率不断减小,至x=7.5%时达到极小值,然后随戈的增大.样品的TC又明显增大.
Series of Sr-doping La2Ce207 samples, that is (La1-xSrx)2Ce2O7-x,were synthesized with sol-gel method. It is shown that (La1-xSrx)2Ce2O7-x crystallize in pure defect-fluorite structure when the Sr-doping amount (x) is less than 0.1. With increasing of temperature, the thermal expansion coefficients (TECs) of (La1-xSrx)2Ce2O7-x increase, and the thermal conductivities (TCs) decrease. At a certain temperature, the TECs of (La1-xSrx)2Ce2O7-x increase with x increasing; and the TCs decrease when x changes from 0 to 0.075,then increase obviously when x≥0.075.
出处
《有色金属科学与工程》
CAS
2015年第4期27-30,共4页
Nonferrous Metals Science and Engineering
基金
国家自然科学基金资助项目(21471088)
关键词
铈酸镧
锶掺杂
热膨胀系数
热导率
thermal expansion coefficient
lanthanum cerate
Sr-doping
thermal conductivity