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Proceedings Paper

Phase transitions in PbTiO3 microcrystals of different size
Author(s): Zygmunt Surowiak; Evgeni G. Fesenko; Vladimir G. Gavrilachenko; Vladimir D. Komarov; Dionizy Czekaj
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Paper Abstract

PbTiO3 crystal is a model ferroelectric material exhibiting perovskite-type structure, high Curie temperature (Tc = 765 K), large spontaneous polarization (Ps=0.42 Cm-2) and electrical conductivity at TcTc =0.1 Ω-1m-1). A method of preparation of PbTiO3 micro-crystals (size 1 - 50 μm) exhibiting isometric shapes and a method of segregating microcrystals into fractions within a narrow size range has been developed. The present work gives results of investigations on kinetics of the phase transition in micro-crystals exhibiting different dimensions. It has been found that P4mmPm3m phase transition occurs in microcrystals in the presence of a single plane interface of {023}-type. During cooling of micro-crystals, the phase plane is followed by formation of the domain structure, which is a superposition of 180° dielectric domains and 90° domains (i.e. structural twins). The temperature hysteresis of position of the phase boundary is ΔTPT ≈ 7K. Such a situation occurs in case of micro-crystals with dimensions larger than critical size (rcr ≈ 20 μm). In case of r < rcr the plane phase boundary is followed by formation of 180° domains only; the structure of 90° do not longer form. The thermal hysteresis also occurs but its value is two times larger (ΔTPT ≈ 14 - 17 K).

Paper Details

Date Published: 22 October 2003
PDF: 8 pages
Proc. SPIE 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics, (22 October 2003); doi: 10.1117/12.518744
Show Author Affiliations
Zygmunt Surowiak, Univ. of Silesia (Russia)
Evgeni G. Fesenko, Rostov State Univ. (Russia)
Vladimir G. Gavrilachenko, Rostov State Univ. (Russia)
Vladimir D. Komarov, Rostov State Univ. (Russia)
Dionizy Czekaj, Univ. of Silesia (Poland)

Published in SPIE Proceedings Vol. 5136:
Solid State Crystals 2002: Crystalline Materials for Optoelectronics
Jaroslaw Rutkowski; Antoni Rogalski, Editor(s)

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