Synthesis and thermal decomposition of lanthanide hexacyanochromate(iii) complexes, Ln[Cr(CN)6]·nH2O (Ln=La-Lu; n=3, 4)
作者： Y. Seto , K. Umemoto , T. Arii , Y. Masuda
DOI: 10.1023/B:JTAN.0000027816.87796.B5
关键词:
摘要: A series of lanthanide hexacyanochromate(III) n-hydrates, Ln[Cr(CN)6]·nH2O (Ln=La-Lu; n=3, 4) were synthesized as the precursors to obtain homogeneous perovskite-type oxides, LnCrO3. In hydrate complexes, Nd[Cr(CN)6]·4H2O was boundary between tetrahydrates and trihydrates, i.e. La, Ce, Pr Nd formed tetrahydrates, other lanthanides trihydrates. The crystal structures La[Cr(CN)6]·4H2O Sm[Cr(CN)6]·3H2O determined by means Rietveld analysis their powder X-ray diffraction profiles. orthorhombic system, Cmcm, monoclinic P21/m. thermal decomposition complex, followed analyses, solid residue mass spectrum gaseous products. LnCrO3 except CeCrO3 obtained final products decompositions. perovskite oxides for Pr, Sm at 800°C, Eu, Gd, Tb Dy 1000°C, 1100°C. product Ce[Cr(CN)6]·4H2O mixture CeO2 Cr2O3.
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