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新金属间化合物Bi_5MnPr_3的晶体结构

Crystal structure of a new compound Bi_5MnPr_3
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摘要 用X射线粉末衍射技术和Rietveld全谱图拟合法研究了新金属间化合物Bi5MnPr3的晶体结构。结构精修所得的R因子为RP=10.79%,RWP=13.70%,RF=5.99%,RB=8.36%。结果表明,该化合物为六方晶系Ce3MnBi结构类型,空间群为P63/mcm(No.193),点阵参数为a=0.964 60(1)nm,c=0.646 501(7)nm,单位晶胞的化学式数量为Z=2,计算密度为Dx=9.62 g/cm3。晶胞中Mn原子占据2b位置,一部分Bi原子占据4d位置,另一部分Bi原子和Pr原子分别占据6g位置。 The crystal structure of a new ternary compound Bi5MnPr3 was determined by X-ray powder diffraction using the Rietveld method.The R-factors of Rietveld refinement were RP=10.79%,RWP=13.70%,RF=5.99%,RB=8.36%,respectively.The result showed that the ternary compound Bi5MnPr3 crystallizes in the hexagonal,space group P63/mcm(No.193) with the Ce3MnBi5-type structure and lattice parameters a=0.964 60(1)nm,c =0.646 501(7)nm,formula units per unit cell Z=2,calculated density Dx=9.62 g/cm3.In the unit cell,Mn atoms occupy the 2b sites,some Bi atoms occupy the 4d sites,while other Bi atoms and Pr atoms are in the 6g sites respectively.
出处 《广西大学学报(自然科学版)》 CAS CSCD 北大核心 2011年第2期339-343,共5页 Journal of Guangxi University(Natural Science Edition)
基金 广西科学基金资助项目(桂科自0648039)
关键词 晶体结构 X射线衍射 金属间化合物 Bi5MnPr3 crystal structure X-ray diffraction intermetallic compound Bi5MnPr3
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