Pressure-Temperature Phase Diagram of Ferroelectric Pyridinium Tetrafluoroborate Crystal(Condensed matter: structure and mechanical and thermal properties)
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概要
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The dielectric constant of pyridinium tetrafluoroborate C_5NH_6・BF_4 (PyBF_4) was measured in the frequency range of 300Hz to about 10MHz under pressures up to about 1.5GPa. The critical slowing down of the dielectric relaxation was observed at all pressures examined, the relaxation frequency of which becomes lower with increasing pressure. The pressure derivative of the transition temperature T_<c1> between the paraelectric phase and the ferroelectric phase, (dT_<c1>/dp)_0, is about 120K/GPa. This is very large compared with those of other typical order-disorder ferroelectrics. The p-T phase diagram was discussed on the basis of phenomenological theory.
- 社団法人日本物理学会の論文
- 2007-01-15
著者
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DEGUCHI Kiyoshi
Department of Materials Science, Shizuoka Institute of Science and Technology
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Deguchi Kiyoshi
Shizuoka Inst. Sci. And Technol. Shizuoka
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Deguchi Kiyoshi
Department Of Material Science Faculty Of Science Hiroshima University
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Deguchi Kiyoshi
Shizuoka Inst. Of Sci. And Technol. Shizuoka
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