Structural Study of the Ferroelectric Phase Transition in Ca_2Sr (C_2H_5CO_2)_6

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概要

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• Crystal structures of Ca.Sr(C.H.C0.). at sixteen temperatures between-l60'C and ]50'C have been determined accurately, using an X-ray fourcircle diffractometer. The occupancies of the three disordered methyl groups in aformula unit, together with the displacements of Sr, Ca and 0 atoms, vary withtemperature in the same manner as the spontaneous polarization which takes asaturated value at - I60'C. In contrast to this, one of the other methyl groupsis in a state of partial disorder even at - 160'C. The major part of the spontaneouspolarization is explainable by displacements of Ca-0., octahedra relative to Srton. Using the result of the thermal expansion along the c-axis measured by theBond method, it was found that the spontaneous strain was compatible with theequivalent two sublattice model on the basis of the determined crystal structures.

• 社団法人日本物理学会の論文
• 1984-03-15

著者

• MISHIMA Naoyuki

  Faculty of Science,Hiroshima University

• Mishima Naoyuki

  Faculty Of Science Hiroshima University

関連論文

• Effect of Heat-Treatment on Dielectric Dispersion of Ferroelectric Ca_2Sr (C_2H_5CO_2)_6
• Partially Disordered Structure of Ca_2Sr (C_2H_5CO_2)_6 in the Ferroelectric Phase
• Refinement of Crystal Structure of Ferroelectric Ca_2Sr (C_2H_5CO_2)_6 in the Paraelectric Phase
• Effect of Growth Temperature on Defect Formation in and Dielectric Properties of Ca_2Sr(C_2H_5COO)_6
• Structural Study of the Ferroelectric Phase Transition in Ca_2Sr (C_2H_5CO_2)_6

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