X-Ray Study on the Successive Phase Transitions of K2CoCl4

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  • Mashiyama Hiroyuki
    Department of Physics, Faculty of Science, Yamaguchi University
  • Suzuki Haruhiko
    Department of Electronic Engineering, College of Science and Engineering, Iwaki Meisei University
  • Shimizu Fuminao
    Department of Electronic Engineering, College of Science and Engineering, Iwaki Meisei University
  • Yamaguchi Toshihisa
    Department of Electric Engineering, College of Science and Engineering, Meisei University
  • Sawada Shozo
    Department of Electronic Engineering, College of Science and Engineering, Iwaki Meisei University

書誌事項

タイトル別名
  • X-Ray Study on the Successive Phase Transitions of K<SUB>2</SUB>CoCl<SUB>4</SUB>
  • X Ray Study on the Successive phase Tra
公開日
1990
DOI
  • 10.1143/jpsj.59.3479
公開者
一般社団法人 日本物理学会

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説明

The structural phase transition of K2CoCl4 is investigated by means of X-ray scattering. The transition temperatures are 558 K, 454 K and 142 K. With decreasing temperature, the symmetry of the crystal changes as follows: phase I, normal [Pmcn]; phase II, incommensurate [q=(1⁄3−δ)c*]; phase III, commensurate [P21cn, q=c*⁄3]; and phase IV, commensurate [C1c1, q=a*⁄2+b*⁄2+c*⁄3]. Here the reciprocal vectors refer to the normal phase. In a narrow temperature range just above 142 K, the superreflection at (5/2 3/2 0) splits into two diffuse peaks. The general feature of the successive transitions is very similar to K2ZnCl4.

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