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Phase Equilibria and Dielectric Properties in Perovskite-like (1 − x)LaCa0.5Zr0.5O3–xATiO3 (A = Ca, Sr) Ceramics

Published online by Cambridge University Press:  31 January 2011

Igor Levin ,
Terrell A. Vanderah ,
Rachel Coutts  and
Steven M. Bell
Igor Levin
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Terrell A. Vanderah
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Rachel Coutts
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Steven M. Bell
Affiliation:
TRAK Ceramics, Inc., Hagerstown, Maryland 21742
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Abstract

Phase equilibria and dielectric properties were analyzed for selected compositions in both LaCa0.5Zr0.5O3–CaTiO3 (LCZ-CT) and LaCa0.5Zr0.5O3–SrTiO3 (LCZ–ST) systems using x-ray powder diffraction and transmission electron microscopy. The end-member LaCa0.5Zr0.5O3 does not occur as a single phase but rather as a mixture of a perovskite-type phase with approximate composition La0.94Ca0.53Zr0.53O3 plus a minor amount of La2O3. This perovskite phase exhibited a combination of 1:1 ordering of Ca and Zr on the B-sites and octahedral tilting. In the (1 – x)LCZ– xCT system, the compositions x = 1/3 and x = 1/2 yielded single phases with perovskite-like structures featuring similar 1:1 B-site ordering superimposed onto octahedral tilting. The x = 1/2 composition in the LCZ–ST system resides in a two-phase field and contains a major perovskite phase and La2O3; the B-cations in the perovskite phase remain disordered at all temperatures. The approximate boundaries of perovskite-like phase fields in the La2O3–ATiO3–CaZrO3 (A = Ca, Sr) systems were outlined, as well as a schematic diagram for perovskite B-cation ordering transitions in the LCZ–CT system. The dielectric properties of the compositions investigated were measured at microwave frequencies and were correlated with the observed structural behavior.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 7 , July 2002 , pp. 1729 - 1734
Copyright
Copyright © Materials Research Society 2002

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