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Phase transformation in Sr1−xBaxNb2O6 ceramics

Published online by Cambridge University Press:  31 January 2011

Xiaoli Wang
Xiaoli Wang
Affiliation:
Electronic Materials Research Laboratory, Xi'an Jiaotong University, Xi'an, 710049, China
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Abstract

The phase transformation in Sr1−xBaxNb2O6 (0.25 ≤ x ≤ 0.8) ceramics was investigated. There is an intermediate transitive phase before forming the tungsten bronze phase at higher temperatures. The phase transformation from the intermediate type into tungsten bronze type is sluggish, affected principally by temperature. In the compositions rich in Ba (x > 0.672), Ba ions prefer to occupy the A2 sites rather than the A1 sites of the tungsten bronze structure. The percentages of vacancies in the A1 sites and A2 sites are no longer the same. With the increase of Ba, the vacancies in the A1 sites increase, whereas the vacancies in the A2 sites decrease.

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Type
Articles
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Journal of Materials Research , Volume 12 , Issue 3 , March 1997 , pp. 600 - 603
Copyright
Copyright © Materials Research Society 1997

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