The role of B-site cation disorder in diffuse phase transition behavior of perovskite ferroelectrics
- 1 August 1980
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 51 (8) , 4356-4360
- https://doi.org/10.1063/1.328296
Abstract
In Pb(Sc0.5Ta0.5)O3 it has been shown that the degree of order in the B‐site Sc3+, Ta5+ cations can be controlled by suitable thermal annealing. For samples which have been well‐ordered by long annealing, dielectric measurements on single crystals show a normal first‐order ferroelectric phase change at 13 °C and a maximum low‐temperature spontaneous polarization of 23.0 μc/cm2. With increasing disorder, the crystals begin to exhibit the classical diffuse phase transition of a ferroelectric relaxor, with a broad Curie range and strong low‐frequency dielectric dispersion in the transition range. X‐ray diffraction measurements of the size of the ordered microregions suggest that ordering proceeds by different mechanisms in single‐crystal versus ceramic samples, though the resulting effects upon the dielectric behavior are very similar.This publication has 3 references indexed in Scilit:
- Diffused phase transitions in BaxSr1−xTiO3 single crystalsJournal of Applied Physics, 1976
- The diffuse phase transition in potassium strontium niobateFerroelectrics, 1974
- Investigation of the Electrical Properties of Sr1−xBaxNb2O6 with Special Reference to Pyroelectric DetectionJournal of Applied Physics, 1969