Nature of the Low-Temperature Dielectric Anomalies in (CH 3NH 3) 5Bi 2X 11 (X: Cl, Br)
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概要
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The low-temperature dielectric anomalies of two isomorphic ferroelectrics (CH3NH3)5Bi2Cl11 (MAPCB) and (CH3NH3)5Bi2Br11 (MAPBB) have been studied in detail. The anomaly in the dielectric constant of MAPBB at 77 K shows a thermal hysteresis along all three crystallographic axes. The broad peak of the dielectric constant along the a-direction of MAPCB around 160 K becomes flatter and more diffuse as pressure increases. It is concluded that the 77 K anomaly in MAPBB represents a first-order phase transition whereas the 160 K anomaly in MAPCB is an over-critical phenomenon of an isomorphous transition.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 1996-01-15
著者
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Iwata Makoto
Department Of Applied Physics School Of Engineering Nagoya University
-
Ishibashi Yoshihiro
Department Of Applied Physics Graduate School Of Engineering Nagoya University
-
Gesi Kazuo
Chikusa-ku, Nagoya 464-01
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Ishibashi Yoshihiro
Department of Applied Physics, School of Engineering, Nagoya University,
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