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Ferroelectrics Volume 219, 1998 - Issue 1
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Section VI: Origin of ferroeletricity and hydrogen bond systems

Discrimination of ferroelectrics from quantum paraelectrics among perovskite titanates ATiO3 AND (A′1/2A′′1/2) TiO3

Tetsuro Nakamura Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, 2753 Ishii-Cho, Utsunomiya, 321-8585, Japan
,
Yue Jin Shan Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, 2753 Ishii-Cho, Utsunomiya, 321-8585, Japan
,
Pai-Hsuan Sun Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, 2753 Ishii-Cho, Utsunomiya, 321-8585, Japan
,
Yoshiyuki Inaguma Materials and Structure Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan
&
Mitsuru Itoh Materials and Structure Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan
Pages 71-81 | Received 24 Mar 1998, Published online: 09 Mar 2011
 
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Abstract

The average mass of A ions m(A) in nonconductive perovskite titanates ATiO3 and (A′1/2 A′′1/2) TiO3 is found to be a good criterion which discriminates the 5 kinds of ferroelectrics (m(A) > 100 a.u.) from the 17 kinds of quantum paraelectrics (m(A) < 100 a.u.). The results denote that Last's mode A-TiO3 in the three ferroelectric soft modes in cubic ATiO3 is responsible to the appearance of ferroelectricity in perovskite titanates. Discussions of the effect of the mass-inequality on the amplitudes of the component particles in the two-particle simple harmonic oscillator are given concerned with Last's mode.

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