Please use this identifier to cite or link to this item:
Title: Dielectric anomalies of Pb0.7La0.2TiO 3-based perovskite
Authors: Soon, H.P. 
Wang, J. 
Keywords: Ferroelectric
Quantum paraelectric
Issue Date: Jul-2006
Citation: Soon, H.P., Wang, J. (2006-07). Dielectric anomalies of Pb0.7La0.2TiO 3-based perovskite. Journal of Electroceramics 16 (4) : 277-282. ScholarBank@NUS Repository.
Abstract: Dielectric transitions from normal ferroelectric to relaxor-like and then to quantum paraelectric-like behaviour were observed by substituting 10 to 60% of Ca2+ for Pb2+ into A-site of Pb0.7La 0.2TiO3 with the required stoichiometry of Pb 0.7(1-x)Ca0.7x La0.2TiO3 (PCLT). The quantum ferroelectric relation that commonly applies to SrTiO3-based perovskites, T maxα (X - X c )1/2, fails to describe the observed dielectric anomalies in PCLT, whereby the transition temperature vanishes with a finite slope. Quantum ferroelectric behaviour that exhibits a sharp dielectric peak but violates the Curie-Weiss law was not observed throughout the composition range studied. Unlike the typical quantum paraelectric SrTiO3, the quantum paraelectric-like behaviour observed for PCLT with x = 0.55 and 0.60 exhibit negative transition temperatures, as shown by the fittings to both the Curie-Weiss and Barrett's relations. Thermal hysteresis was surprisingly observed in substituted PCLT with x = 0.30 and 0.40 that exhibit frequency dispersive relaxation. To establish a correlation between the dielectric anomalies and structural parameters, analyses on global and local perovskite lattices were carried out using X-ray diffraction technique and micro-Raman spectroscopy. © Springer Science + Business Media, LLC 2006.
Source Title: Journal of Electroceramics
ISSN: 13853449
DOI: 10.1007/s10832-006-9864-6
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Jul 30, 2020


checked on Jul 22, 2020

Page view(s)

checked on Aug 2, 2020

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.