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Formation and Characterization of “1:1” Ordered Phases in Am4+O3 - A(B2+1/3Ta2/3)O3 (A= Ba, Sr; B2+ = Mg, Zn; M4+ = Ti, Sn, Zr, Ce) Perovskites

Published online by Cambridge University Press:  15 February 2011

L. Chai ,
M. A. Akbas  and
P. K. Davies
L. Chai
Affiliation:
Department of Materials Science & Engineering, University of Pennsylvania, Philadelphia, PA, 19104–6272, lchai(or akbas, davies@lrsm.upenn.edu
M. A. Akbas
Affiliation:
Department of Materials Science & Engineering, University of Pennsylvania, Philadelphia, PA, 19104–6272, lchai(or akbas, davies@lrsm.upenn.edu
P. K. Davies
Affiliation:
Department of Materials Science & Engineering, University of Pennsylvania, Philadelphia, PA, 19104–6272, lchai(or akbas, davies@lrsm.upenn.edu
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Abstract

Previous research has demonstrated that the formation of nano-sized “1:1” cation ordered domains in Zr4+ substituted Ba(Zn1/3Ta2/3)O3 may be responsible for the anomalies in the dielectric loss properties of these perovskite ceramics. To explore the structure and crystal chemistry of these phases, the effect of a series of M4+ substitutions (Zr4+, Ce4+, Sn4+, and Ti4+) on the B-site cation ordering in Ba(Zn1/3Ta2/3)O3, Ba(Mg1/3Ta2/3)O3, and Sr(Mg1/3Ta2/3)O3 has been examined. In all cases the substitution of low levels (∼ 5 mole %) of “over-sized” tetravalent cations (e.g. Zr4+, Ce4+) promotes a transformation to a 1:1 ordered phase, while the introduction of “under-sized” cations (e.g. Ti4+) stabilizes a disordered perovskite. Using Rietveld methods the structures of the 1:1 ordered A(βI1/2βII1/2)O3 phases were found to conform to a “random layer” model in which the βII positions are occupied by Ta, and the βI sites by a random distribution of the Mg(Zn), M4+ and residual Ta cations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 443
Copyright
Copyright © Materials Research Society 1997

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References

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