Jpn. J. Appl. Phys. 35 (1996) pp. 5196-5198  |Next Article|  |Table of Contents|
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Size Effect on the Phase Transition in PbTiO₃ Fine Particles

Kenji Ishikawa, Takashi Nomura, Nagaya Okada and Kazumasa Takada

(Received May 7, 1996; accepted for publication July 5, 1996)

The finite size effect on the phase transition in PbTiO₃ fine particles is described. Very small crystals with an average diameter of 14.2 nm were obtained by lowering the calcination temperature to 400° C. Raman scattering measurements of such fine particles were carried out to study the dependence of the phase transition temperature on the particle size. The X-ray diffraction pattern was also measured to study the tetragonality, c/a ratio. The results strongly suggest the presence of a critical size below which the ferroelectric state becomes unstable. The critical size determined by Raman measurements was 10.7 nm.

URL: http://jjap.jsap.jp/link?JJAP/35/5196/
DOI: 10.1143/JJAP.35.5196
KEYWORDS:size effect, lead titanate, ferroelectric materials, fine particles, tetragonality, soft mode

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