多元稀土硼化物Ce_xBa_(1-x)B_6的制备及表征

Preparation and Characterization of Multiple Rare Earth Hexaboride Ce_xBa_(1-x)B_6

采用稀土氧化物CeO_2,碱土氧化物BaO和硼氢化钠NaBH_4为原料,通过固相反应成功制备出多元稀土六硼化物Ce_xBa_(1-x)B_6.系统研究反应温度为1 150℃时,Ce元素的掺杂量分别为x=0.1,0.3,0.5和0.7对Ce_xBa_(1-x)B_6粉末样品的物相、形貌及微观结构的影响.XRD衍射结果表明,所制备粉末均由单相的CsCl型晶体结构构成,空间群为Pm-3 m.扫描电镜结果表明,成分为Ce_(0.3)Ba_(0.7)B_6粉末已出现少量立方形貌微米晶粉末,而CeB_6由平均晶粒度为100nm的立方形貌构成.对单颗粒透射电镜观察结果表明,该颗粒具有良好的结晶质量.能谱分析结果充分证明了Ce原子无序替代了Ba原子晶位.

In this paper,rare earth oxide CeO_2,alkaline oxide BaO and NaBH_4as raw materials were used to prepare the multiple rare earth hexaboride Ce_xBa_（1-x）B_6（When the reaction temperature was 1150℃,the Ce doping effects which content is x=0.1,0.3,0.5and 0.7on phase composition,morphology and microstructure were studied.）The XRD results showed that all the synthesized powders have a CsCl type single phase with space group of Pm-3 m.The SEM results showed that there were exists some cubic-shape micro-crystalline for Ce_（0.3）Ba_（0.7）B_6and the average grain size of CeB_（6 ）was 100nm.The EDS results of TEM for Ce_（0.5）Ba_（0.5）B_6single crystal confirmed the Ce atoms randomly occupied the lattice site of Ba atom.