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Synthesis and dielectric properties of barium tantalates and niobates with complex perovskite structure

Published online by Cambridge University Press:  31 January 2011

T. Kolodiazhnyi ,
A. Petric ,
A. Belous ,
O. V'yunov  and
O. Yanchevskij
T. Kolodiazhnyi
Affiliation:
Department of Materials Science & Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada
A. Petric*
Affiliation:
Department of Materials Science & Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada
A. Belous
Affiliation:
Department of Solid State Chemistry, Institute of General and Inorganic Chemistry, 32/43 Palladina Ave., Kyiv-142, Ukraine
O. V'yunov
Affiliation:
Department of Solid State Chemistry, Institute of General and Inorganic Chemistry, 32/43 Palladina Ave., Kyiv-142, Ukraine
O. Yanchevskij
Affiliation:
Department of Solid State Chemistry, Institute of General and Inorganic Chemistry, 32/43 Palladina Ave., Kyiv-142, Ukraine
*
a)Address all correspondence to this author.petric@mcmaster.ca
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Abstract

Phase composition, degree of cation ordering, and dielectric properties of complex perovskites with general formula Ba(B' 1/3B"2/3)O3, where B′ = Mg, Zn, and Ni and B" = Nb and Ta, were analyzed. It was found that all the studied complex perovskites attained high degrees of 1:2 cation ordering at temperatures specific to each composition. A high temperature order–disorder phase transition in Ba(Zn1/3Nb2/3)O3 occurred below 1380 °C. Ba(Ni1/3Nb2/3)O3 (BNN) and Ba(Mg1/3Nb2/3)O3 (BMN) pervoskites remained 100% ordered at temperatures as high as 1500 and 1620 °C, respectively. It was found that in BMN and BNN extrinsic factors, such as the second phase (i.e., Ba3Nb5O15) and point defects, dominated the dielectric loss at microwave frequencies. Ba(Mg1/3Ta2/3)O3 (BMT) remained single phase up to 1630 °C. Above this temperature, the Ba3Ta5O15 second phase was detected. A decrease in the 1:2 cation ordering and increase of dielectric loss in BMT occurred at sintering temperatures above 1590 °C. It was also revealed by electron paramagnetic resonance that all samples studied contained a substantial amount of paramagnetic point defects. These defects contributed to extrinsic dielectric loss at microwave frequencies, thus degrading the Q factor.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3182 - 3189
Copyright
Copyright © Materials Research Society 2002

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