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Coexistence of 1 : 2 and 1 : 1 long-range ordering types in La-modified Ba(Mg0.33Ta0.67)O3 ceramics

Published online by Cambridge University Press:  31 January 2011

Hyuk-Joon Youn ,
Kug Sun Hong  and
Hwan Kim
Hyuk-Joon Youn
Affiliation:
Department of Inorganic Materials Engineering, Seoul National University, Seoul, Korea 151-742
Kug Sun Hong
Affiliation:
Department of Inorganic Materials Engineering, Seoul National University, Seoul, Korea 151-742
Hwan Kim
Affiliation:
Department of Inorganic Materials Engineering, Seoul National University, Seoul, Korea 151-742
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Abstract

The ordering structure of lanthanum-substituted Ba(Mg0.33Ta0.67)O3 was investigated using x-ray diffraction. It was observed that the ordering type of this solid solution transformed from 1: 2 to 1: 1 with 10 mol% substitution of La(Mg0.67Ta0.33)O3. These two types of ordering coexist over a wide range of composition. This coexistence of ordering types was considered as phase coexistence and its physical origin was investigated using microwave measurements. Based on the intensity of superlattice reflections and the discontinuity in dielectric properties, it was suggested that the coexistence of two ordering types originates from the overlap of the two stability regions.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 3 , March 1997 , pp. 589 - 592
Copyright
Copyright © Materials Research Society 1997

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