Phase Transitions in (CH_3NH_3)_4InBr_7

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概要

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• Measurements of the dielectric constant, the DTA signal and the linear thermal ex-pansion, optical observation of domain structure and X-ray examination of(CFI3NH.).InBr.have been carried out over a temperature range from 25'Cto l80'C.It is found that the crystal undergoes phase transitions at 171'C (T, ) and 141'C (7'.),and is ferroelastic below T,. The crystal at room temperature belongs to monoclinicP2/n with lattice parameters: a=16.854(6)A, #=7.73l(6)A, c=16.756(9)A andp= 103.22(2)'. When the symmetry is approximated as to be pseudo-orthorhombicby taking a'=a-Vc, b'=b and c'=c -a (/7'=90.34(11)'), the domain structure ob-served below T. is deduced from the strain-compatibility relations for the domainboundaries by taking account of the symmetry change from rnmm to 2 / m at T.. At T.no change of domain configuration has been detected.[phase transition, ferroelastics, domain structure, X-ray examination, dielectric ll constant, (Cl,NH.).InBr.l

• 社団法人日本物理学会の論文
• 1991-11-15

著者

• Arai Masazumi

  Kyushu University

• KOMUKAE Masaru

  Department of Applied Physics, Faculty of Science, Science University of Tokyo

• OSAKA Toshio

  Department of Applied Physics, Faculty of Science, Science University of Tokyo

• Arai M

  Computational Materials Science Center National Institute For Materials Science

• Osaka T

  Tokyo Univ. Sci. Tokyo

• Osaka Toshio

  Department Of Applied Physics Faculty Of Science Tokyo University Of Science

• Osaka Toshio

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Komukae M

  Tokyo Univ. Sci. Tokyo

• Komukae Masaru

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• MAKITA Yasuharu

  Department of Applied Physics,Faculty of Science,Science University of Tokyo

• Irokawa Katsumi

  Department of Applied Physics, Faculty of Science, Science University of Tokyo

• Irokawa Katsumi

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Arai Masatoshi

  Physics Department Tohoku University:argonne National Loboratory

• Miyazaki A

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Miyazaki Akio

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo:chiba High School

• Makita Yasuharu

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

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