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Ferroelectric phase transition in Cs3Bi2I9

  • Lattice Dynamics. Phase Transitions
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Abstract

Single crystals of Cs3Bi2I9 have been grown. Polarized-optical, dielectric, and calorimetric studies have been performed, along with measurements of birefringence, and the coefficients of elasticity c 44, and linear expansion a over a wide temperature range. It is found that an intrinsic (pseudo-intrinsic) second-order phase transition to the ferroelastic phase takes place at T 0=220.0±0.6 K accompanied by a change of the crystal symmetry from 6/mmc to 2/m. The transition parameter depends linearly on the shear strain x 5 and varies with temperature according to a power law with exponent β=0.5.

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Authors and Affiliations

  1. L. V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

    S. V. Mel’nikova & A. I. Zaitsev

Authors
  1. S. V. Mel’nikova
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  2. A. I. Zaitsev
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Zh. Éksp. Teor. Fiz. 39, 1850–1852 (October 1997)

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Mel’nikova, S.V., Zaitsev, A.I. Ferroelectric phase transition in Cs3Bi2I9 . Phys. Solid State 39, 1652–1654 (1997). https://doi.org/10.1134/1.1129882

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  • DOI: https://doi.org/10.1134/1.1129882

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