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Crystal structure of microwave dielectric ceramics Ba[(Mg1−xCdx)0.33Nb0.67]O3

Published online by Cambridge University Press:  01 March 2012

J. X. Deng ,
X. R. Xing ,
J. Chen ,
R. B. Yu ,
G. R. Liu  and
J. Meng
J. X. Deng
Affiliation:
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China
X. R. Xing
Affiliation:
Department of Physical Chemistry and State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
J. Chen
Affiliation:
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China
R. B. Yu
Affiliation:
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China
G. R. Liu
Affiliation:
Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China
J. Meng
Affiliation:
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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Abstract

A series of complex perovskite solid solutions of Ba[(Mg1−xCdx)0.33Nb0.67]O3 have been synthesized by the columbite method. Detailed Rietveld refinement of their X-ray diffraction data show that Ba[(Mg1−xCdx)0.33Nb0.67]O3 has an order trigonal structure. The ordering degree as determined by the B-site occupancies increases with the partial substitution of Cd for Mg. However, a decrease in the ordering degree in the Ba(Cd0.33Nb0.67)O3 sample is observed, which can be attributed to a relatively lower synthesis temperature. All the impurity phases are successfully identified by X-ray quantitative phase analysis. Dielectrics properties at low frequencies for all the Ba[(Mg1−xCdx)0.33Nb0.67]O3 compounds have been measured successfully.

Keywords

Ba[(Mg1−xCdx)0.33Nb0.67]O3order-disorderX-ray diffractionRietveld method
Type
Representative Papers from the Chinese XRD 2006 Conference
Information
Powder Diffraction , Volume 22 , Issue 4 , December 2007 , pp. 295 - 299
Copyright
Copyright © Cambridge University Press 2007

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