【摘要】 六硼化铕（EuB₆）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（Eu₂O₃）、氧化硼（B₂O₃）、碳黑（C）为原料合成EuB₆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Eu₂O₃-B₂O₃-C体系制备EuB₆,在管式炉中1600℃保温5 h可得到纯相的EuB₆粉体。该体系反应并非一步完成,Eu₂O₃先转化成中间相Eu（BO₂）₃,然后分解转化为EuB₂O₄、Eu₂B₂O₅两种二价稀土硼酸盐产物,最后EuB₂O₄和Eu₂B₂O₅分别与B₂O₃、C反应,最终生成EuB₆。该合成工艺简单,原料容易获得,适合批量合成。更多还原

【Abstract】 Europium hexaboride（EuB₆） has many special properties. While compared with other rare earth hexaborides, there are few studies of EuB₆, and the existing synthesis methods of it have high cost and harsh conditions. A carbothermal reduction synthesis process of EuB₆ from europium oxide（Eu₂O₃）, boron oxide（B₂O₃）, 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 EuB₆ powder can be obtained by applying Eu₂O₃-B₂O₃-C system and holding in tubular furnace at 1600℃ for 5 hours. The synthesis reaction is not completed in one step. Eu₂O₃ is first transformed into mesophase Eu（BO₂）₃ and then decomposed into two divalent rare earth borates, EuB₂O₄ and Eu₂B₂O₅, finally EuB₂O₄ and Eu₂B₂O₅ react with B₂O₃ and carbon black（C） respectively to form EuB₆. The proposed synthesis process of EuB₆ is simple and the raw materials are easy to obtain, which is suitable for batch synthesis.更多还原