有色金属科学与工程
有色金屬科學與工程
유색금속과학여공정
JIANGXI NONFERROUS METALS
2015年
4期
27-30
,共4页
梁红彦%李林艳%范闽光%李斌%杨斌%刘欣
樑紅彥%李林豔%範閩光%李斌%楊斌%劉訢
량홍언%리림염%범민광%리빈%양빈%류흔
铈酸镧%锶掺杂%热膨胀系数%热导率
鈰痠鑭%鍶摻雜%熱膨脹繫數%熱導率
시산란%송참잡%열팽창계수%열도솔
thermal expansion coefficient%lanthanum cerate%Sr-doping%thermal conductivity
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（x）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x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x的增大，样品的TC又明显增大．
採用溶膠-凝膠法閤成（La1-xSrx）2Ce2O7-x繫列組分樣品．研究結果錶明：噹 Sr的摻雜量（x）小于10%時，（La1-xSrx）2Ce2O7-x繫列組分樣品都是缺陷螢石結構．隨著溫度的升高，樣品的熱膨脹繫數（TEC）增大，而熱導率（TC）呈減小趨勢．在一定溫度下，（La1-xSrx）2Ce2O7-x的TEC隨x的增大而增大；噹Sr摻雜量x在0~7.5%之間增加時，樣品的熱導率不斷減小，至x=7.5%時達到極小值，然後隨x的增大，樣品的TC又明顯增大．
채용용효-응효법합성（La1-xSrx）2Ce2O7-x계렬조분양품．연구결과표명：당 Sr적참잡량（x）소우10%시，（La1-xSrx）2Ce2O7-x계렬조분양품도시결함형석결구．수착온도적승고，양품적열팽창계수（TEC）증대，이열도솔（TC）정감소추세．재일정온도하，（La1-xSrx）2Ce2O7-x적TEC수x적증대이증대；당Sr참잡량x재0~7.5%지간증가시，양품적열도솔불단감소，지x=7.5%시체도겁소치，연후수x적증대，양품적TC우명현증대．
Series of Sr-doping La2Ce2O7 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.
