Synthesis and Single Crystal Growth of the Solid Solution of Perovskite-type Fluorides under Hydrothermal Conditions

Kazumichi Yanagisawa, Masahiro Yoshimura, Shigeyuki Somiya

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Abstract

The hydrothermal method has been applied to synthesize solid solutions in the pseudo-binary systems among perovskite-type fluorides (KMF3 : M = Mn, Co, Ni, Zn and Mg) from mixtures of eo-precipitated ppwders. The continuous solid solutions existed in the all binary systems. Solid solutions in systems were produced in 2 mol KC1 solution under 100 MPa at 300°C, Transition metal ions in perovskite-type fluorides was more easily substituted by other transition metal ions than Mg2+ ion. Crystals of solid solutions were grown by transportation at the top of the capsule, where the temperature was lower than at the bottom. The crystals in KMnF3-KCoF3, KMnF3-KZnF3 and KCoF3-KZnF3 systems grew faster than the other systems. Their single crystals grew up ■ to 1.5mm in cubic′or rectangular prism form. These crystals were considered to have the same composition as that of the starting material, except for those based on KMgF3. The lattice parameter of the mixed crystals in the KCoF3-KZnF3 system changes continuously with composition, indicating1 that it obeys to the Vegard's law. The distribution of metal ions in the single crystal of KCoo,5Zn0i5F3 was found to be homogeneous within experimental errors.

Original languageEnglish
Pages (from-to)1382-1390
Number of pages9
JournalNippon Kagaku Kaishi
Volume1981
Issue number9
DOIs
Publication statusPublished - 1981 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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