Crystal structures of CsFe2S3 and RbFe2S3: synthetic analogs of rasvumite KFe2S3
Crystal structures of CsFe2S3 and RbFe2S3: synthetic analogs of rasvumite KFe2S3
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CsFe2S3 和 RbFe2S3 的晶体结构：硅铝矿 KFe2S3 的合成类似物
DOI：
10.1016/j.jssc.2004.01.007
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发表时间：
2004
影响因子：
3.3
通讯作者：
E. Potter
中科院分区：
文献类型：
--
作者：
R. Mitchell;K. C. Ross;E. Potter
The isostructural alkali thioferrate compounds CsFe{sub 2}S{sub 3}, RbFe{sub 2}S{sub 3} and KFe{sub 2}S{sub 3} have been synthesized by reacting Fe and S with their corresponding AFeS{sub 2} (A=K, Rb, Cs) precursors. The crystal structures of these and binary compounds of intermediate composition were determined by Rietveld analysis of laboratory powder X-ray diffraction patterns. All of the synthesized compounds adopt the space group Cmcm (no. 63), Z=4 with: a=9.5193(8) A, b=11.5826(10) A, c=5.4820(4) Afor CsFe{sub 2}S{sub 3}; a=9.2202(7) A, b=11.2429(9) A, c=5.4450(3) A for RbFe{sub 2}S{sub 3}; and a=9.0415(13) A, b=11.0298(17) A, c=5.4177(6) A for KFe{sub 2}S{sub 3}. These mixed valence alkali thioferrates show regular changes in cell dimensions, AS{sub 10} (A=K, Rb, Cs) polyhedron volumes, polyhedron distortion parameters, and calculated oxidation state of Fe with respect to increasing size of the alkali element cation. The calculated empirical oxidation state of iron varies from +2.618 (CsFe{sub 2}S{sub 3}), through +2.666 (RbFe{sub 2}S{sub 3}) to +2.77 (KFe{sub 2}S{sub 3})
The isostructural alkali thioferrate compounds CsFe{sub 2}S{sub 3}, RbFe{sub 2}S{sub 3} and KFe{sub 2}S{sub 3} have been synthesized by reacting Fe and S with their corresponding AFeS{sub 2} (A=K, Rb, Cs) precursors. The crystal structures of these and binary compounds of intermediate composition were determined by Rietveld analysis of laboratory powder X-ray diffraction patterns. All of the synthesized compounds adopt the space group Cmcm (no. 63), Z=4 with: a=9.5193(8) A, b=11.5826(10) A, c=5.4820(4) Afor CsFe{sub 2}S{sub 3}; a=9.2202(7) A, b=11.2429(9) A, c=5.4450(3) A for RbFe{sub 2}S{sub 3}; and a=9.0415(13) A, b=11.0298(17) A, c=5.4177(6) A for KFe{sub 2}S{sub 3}. These mixed valence alkali thioferrates show regular changes in cell dimensions, AS{sub 10} (A=K, Rb, Cs) polyhedron volumes, polyhedron distortion parameters, and calculated oxidation state of Fe with respect to increasing size of the alkali element cation. The calculated empirical oxidation state of iron varies from +2.618 (CsFe{sub 2}S{sub 3}), through +2.666 (RbFe{sub 2}S{sub 3}) to +2.77 (KFe{sub 2}S{sub 3})