Dielectric properties of (1-x)La(Mg1/2Ti1/2)O-3-xSrTiO(3) ceramics
authors Seabra, MP; Salak, AN; Ferreira, M; Ribeiro, JL; Vieira, LG
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords dielectric properties; La(Mg,Ti)O-3; perovskites; powders-chemical preparation; spectroscopy; SrTiO3
keywords COMPLEX PEROVSKITES; SYSTEM
abstract Powders of (1-x)La(Mg1/2Ti1/2)O-3-xSrTiO(3) series have been prepared by a non-conventional chemical route based on the Pechini method. Homogeneous solid solutions allowed the sintering of dense and single-phase ceramics for the full composition range (0 less than or equal to v < 1). Crystal structure of the ceramics was investigated by XRD and several compositional driven structural transformations were observed. The dielectric function of the ceramics was measured at radio, microwave and far infrared (FIR) frequency ranges to help clarifying the relationship between dielectric properties and structure. The FIR data were found to reflect clearly the sequence of structural modifications observed. In order to evaluate the importance of intrinsic mechanisms in the dielectric response at the GHz and MHz ranges, the reflectivity spectra were fit to the Berreman-Unterwald form of dielectric function. The fits showed that the lower frequency dielectric response seems to be dominated by lattice phonons. Microwave permittivity and temperature coefficient of the resonant frequency were found to obey a hyperbolic-type law. (C) 2003 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2004
volume 24
issue 10-11
beginning page 2995
ending page 3002
digital object identifier (doi) 10.1016/j.jeurceramsoc.2003.10.010
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000222117700012
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 3.794
5 year journal impact factor 3.536
category normalized journal impact factor percentile 98.148
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg