Phase transition in PbTiO3ultrafine particles of different sizes
- 19 April 1993
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 5 (16), 2619-2624
- https://doi.org/10.1088/0953-8984/5/16/018
Abstract
The size effect on the ferroelectric phase transition in PbTiO3 ultra-fine particles is reported. Samples with particle sizes from 20 to 200 nm were prepared by a sol-gel process followed by calcining at different temperatures. The particle size was determined by X-ray diffraction from the integrated width of diffractions. The soft-mode frequency at room temperature was measured by Raman scattering. It decreases with decreasing particle size. The ferroelectric phase transition was traced by specific-heat measurement. The transition temperature decreases and the transition becomes diffused as the particle size decreases. The size dependence of TC can be described by TC(D)=766-256/(D-8.8) (K), where 766 K is the TC for bulk PbTiO3 and D (nm) is the particle size. This equation gives a critical size of 9.1 nm below which ferroelectricity disappears.Keywords
This publication has 18 references indexed in Scilit:
- Limiting long-range-ordered solids to finite sizes in condensed-matter physicsPhase Transitions, 1990
- Dependence of the Crystal Structure on Particle Size in Barium TitanateJournal of the American Ceramic Society, 1989
- Size effect on the ferroelectric phase transition inultrafine particlesPhysical Review B, 1988
- Grain-size effects on dielectric phase transition of BaTiO3 ceramicsSolid State Communications, 1987
- The effect of grain size on the permittivity of BaTiO3Ferroelectrics, 1984
- Evolution of ferroelectricity in ultrafine-grained Pb5Ge3O11 crystallized from the glassJournal of Applied Physics, 1977
- “Size” phenomena in ferroelectric vacuum depositsFerroelectrics, 1976
- Grain-size effects on properties of some ferroelectric ceramicsJournal of Physics C: Solid State Physics, 1974
- Effects of Grain Size and Porosity on Electrical and Optical Properties of PLZT CeramicsJournal of the American Ceramic Society, 1973
- Space Charge Layer Near the Surface of a FerroelectricPhysical Review B, 1955