Critical Behaviour of Dielectric Permittivity and Spontaneous Polarization of Triglycine Sulphate Single Crystals Doped with Organic Molecules

概要

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Dielectric permittivity, c.., spontaneous polarization, P., and coercive field, E., oftriglycine sulphate (TGS) crystals doped with d -l alanine, orthonitroaniline,paranitroaniline or aniline molecules have been measured from room temperature upto the transition point. A remarkable displacement of the hysteresis loops of polarizaLion along the direction of the field axis and a broadened transition from the polar tothe non-polar phase are detected. An increase in the value of P. and a decrease ofboth c.. and E. are also observed. The changes in both c.. and P. attributed to the crea-lion by the dopants of an internal electric field, E,. The internal bias affects the Curieconstant and 'max in a way similar to that introduced by an external bias. The value ofE. in the vicinity of the phase transition and the parameters of the statistical dipolartheory of ferroelectricity have been calculated.
社団法人日本物理学会の論文
1989-09-15