The influence of dc bias on the dielectric response of Sr1-xCaxTiO3 ceramics

authors	Tkach, A; Araujo, B; Vilarinho, PM
editors	Vilarinho, PM
nationality	International
journal	ADVANCED MATERIALS FORUM III, PTS 1 AND 2
author keywords	SrTiO3; doping; dielectric ceramics; structure
keywords	PHASE-TRANSITIONS; SRTIO3
abstract	The effect of the electric field on the dielectric response of the Sr1-xCaxTiO3 ceramic system was analysed and complemented by structural and microstructural studies. A monotonic decrease of the lattice parameter and an increase of the average grain size from I I to 23 mu m with increasing x were observed by X-ray diffraction and scanning electron microscopy analysis respectively. Samples with x = 0.003 and 0.01 reveal a monotonous increase of low-temperature dielectric constant, corresponding to an enhancement of the tunability and a reduction of the driving electric field at 10-30 K for x = 0.01. For Sr1-xCaxTiO3 ceramic samples with x = 0.04 and 0.10 the ferroelectric phase transition of around 20 K was observed together with the enhanced tunability of the dielectric constant at 30-85 K for x = 0.10.
publisher	TRANS TECH PUBLICATIONS LTD
issn	0255-5476
year published	2006
volume	514-516
beginning page	240
ending page	244
web of science category	Materials Science, Multidisciplinary
subject category	Materials Science
unique article identifier	WOS:000238056400050