Sr掺杂Gd2Ce2O7陶瓷材料的制备及热导率  

Preparation and Thermal Conductivity of Sr Doped Gd2Ce2O7

作　　者：贾燕[1] 杨树森[2] 张红松 JIA Yan;YANG Shusen;ZHANG Hongsong(School of Art and Design,Hebei Institute of Communication College,Shijiazhuang 050000,China;Department of Rail Transit Security,Railway Police College,Zhengzhou 450002,China;School of Mechanical Engineering,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]河北传媒学院美术与设计学院,050000 [2]铁道警察学院轨道交通安全保卫系,郑州450002 [3]河南工程学院机械工程学院,郑州451191

出　　处：《中国陶瓷》2020年第6期28-33,共6页China Ceramics

基　　金：河南省高校科技创新团队支持计划项目(18IRTSTHN005),河南省高等学校重点科研项目(19A480001)。

摘　　要：采用溶胶凝胶法和固相烧结法制备了(Gd1-xSrx)2Ce2O7-x陶瓷材料。采用X射线衍射技术、拉曼光谱、扫描电镜等技术手段对粉体及致密块体材料的相组成、显微形貌及元素组成进行了分析表征,用激光热导仪测试了材料的热导率。结果表明,所制备的纳米粉体及致密块体材料均具有单一的萤石晶体结构,粉体具有明显的团聚和烧结现象,块体材料晶界清晰,相对致密度均在90%以上。由于Sr与Gd之间原子量及离子半径的差别,以及氧空位浓度的增加,加剧了声子的散射程度,从而使材料的热导率明显降低,该系列材料在800℃时的热导率约在1.08~1.96 W/m·K之间。The(Gd1-xSrx)2Ce2O7-x ceramics were synthesized by sol-gel and solid-state sintering method.The X-ray diffraction,Raman spectrum and scanning electron microscope were adopted to analyze its phasestructure,microstructure and element composition,respectively.A laser heat-conduction instrument was applied to measure the thermal conductivity.Results showed that the prepared powders and bulk-samples are of single fluorite-lattice.The powders exhibited clear agglomeration and sintering phenomenon.The bulk samples presented relatively dense microstructure with the density of above 90%,interfaces between grains are very clean,no other phases or un-reacted oxides can be found.Due to the difference between atomic weigth and ion radius of Sr and Gd,the increase concentration pof oxygen vacancies,which enhanced phonon scattering,then the thermal conductivity of Gd2Ce2O7 were decreased distinctly,which are located in the range of 1.08~1.96 W/m.K at 800℃.

关 键 词：Gd2Ce2O7 原子掺杂 声子散射 热导率 

分 类 号：TB383[一般工业技术—材料科学与工程] TQ174.758[化学工程—陶瓷工业]