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化学学报
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化学学报 ›› 1995, Vol. 53 ›› Issue (5): 468-472. 上一篇    下一篇

研究论文

新型混价稀土氟化物KEuLaF~6: 结构设计和碱金属还原法相结合的新产品

贯军;汤中佳;吴国庆   

  1. 北京师范大学化学系
  • 发布日期:1995-05-15

Novel compound KEuLaF~6, its synthesis, structure of properties

GUAN JUN;TANG ZHONGJIA;WU GUOQING   

  • Published:1995-05-15

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用钾还原Eu~0.5La~0.5F~3合成了KEuLaF~6。新化合物属于UCl~3的填隙结构,gagarinite和NaNdF~4的相关型。空间群P3, 三方晶系, 点阵参数: a=646.8(6),c=373.9(4)pm, c/a=0.578, V=135.47·10^6(12)pm^3, D~p~y~c=5.37,D~x=5.44g·cm^-^3, Z=1。新化合物在空气中稳定, 不溶于水。还报道新化合物的荧光图谱和红外

关键词: 氟化物, 镧, 结构设计, 铕, 稀土, KEULAA~6, 碱金属还原法

Novel compound KEuLaF~6 was synthesized by reducing tysonite structure rare earth mixed trifluoride Eu~0.5La~0.5F~3 with metallic potassium. The new compound was the first member of the compounds which have the general formula ABCF~6 with B=divalent and C=trivalent rare earth elements. The crystal structure of the new compound may be discribed as a stuffed structure of UCl~3, related to the structure of gagarinite and NaNdF~4; crystal system; trignal; space group: P3; Lattice parameters: a=646.8(6), c=373.9(4)pm, c/a=0.578, V=135.47·10^6(12)pm^3, D~p~y~c=5.37, D~x=5.44g·cm^-^3, Z=1. X-ray powder diffraction pattern with measured and calculated intensities, IR and fluorescence spectra were given.

Key words: FLUORIDE, LANTHANUM, STRUCTURAL DESIGN, EUROPIUM, RARE EARTH

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