碳热还原法合成六硼化铕粉体  

Europium Hexaboride(EuB_(6))Powder Synthesis by Carbothermal Reduction

作　　者：吴佳稳 许文涛[1] 周有福[1] 石明[1] WU Jia-wen;XU Wen-tao;ZHOU You-fu;SHI Ming(Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China)

机构地区：[1]中国科学院福建物质结构研究所,福建福州350002

出　　处：《真空电子技术》2021年第5期54-57,共4页Vacuum Electronics

摘　　要：六硼化铕(EuB_(6))具有诸多特殊的性能,但相对于其他稀土六硼化物,相关研究较为欠缺,现有合成方法成本高、条件苛刻。本工作首次提出以氧化铕(Eu_(2)O_(3))、氧化硼(B_(2)O_(3))、碳黑(C)为原料合成EuB_(6)的碳热还原技术路线,并用X射线衍射、扫描电镜对合成的粉体进行表征。结果表明:采用Eu_(2)O_(3)-B_(2)O_(3)-C体系制备EuB_(6),在管式炉中1600℃保温5 h可得到纯相的EuB_(6)粉体。该体系反应并非一步完成,Eu_(2)O_(3)先转化成中间相Eu(BO_(2))3,然后分解转化为EuB_(2)O_(4)、Eu_(2)B_(2)O_(5)两种二价稀土硼酸盐产物,最后EuB_(2)O_(4)和Eu_(2)B_(2)O_(5)分别与B_(2)O_(3)、C反应,最终生成EuB_(6)。该合成工艺简单,原料容易获得,适合批量合成。Europium hexaboride(EuB_(6))has many special properties.While compared with other rare earth hexaborides,there are few studies of EuB_(6),and the existing synthesis methods of it have high cost and harsh conditions.A carbothermal reduction synthesis process of EuB_(6)from europium oxide(Eu_(2)O_(3)),boron oxide(B_(2)O_(3)),and carbon black(C)was proposed for the first time,and the synthesized powder was characterized by XRD and SEM.The results show that pure EuB_(6)powder can be obtained by applying Eu_(2)O_(3)-B_(2)O_(3)-C system and holding in tubular furnace at 1600℃for_(5)hours.The synthesis reaction is not completed in one step.Eu_(2)O_(3)is first transformed into mesophase Eu(BO_(2))3 and then decomposed into two divalent rare earth borates,EuB_(2)O_(4)and Eu_(2)B_(2)O_(5),finally EuB_(2)O_(4)and Eu_(2)B_(2)O_(5)react with B_(2)O_(3)and carbon black(C)respectively to form EuB_(6).The proposed synthesis process of EuB_(6)is simple and the raw materials are easy to obtain,which is suitable for batch synthesis.

关 键 词：EuB_(6) 合成方法 碳热还原法 

分 类 号：TB383[一般工业技术—材料科学与工程]