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Combustion syntheses for BaTi4O9 and PbxBa1x Ti4O9

Published online by Cambridge University Press:  31 January 2011

Zhimin Zhong
Affiliation:
Departments of Chemistry and Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210–1173
Patrick K. Gallagher
Affiliation:
Departments of Chemistry and Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210–1173
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Abstract

BaTi4O9 and PbxBa1x Ti4O9, where x is 0.1, 0.2, 0.3, 0.4, or 0.5, have been prepared by a combustion synthesis process. The process starts with spray drying aqueous solutions of Pb(NO3)2, Ba(NO3)2, TiO(NO3)2, and β-alanine with appropriate ratios. Combustion reactions occur when heating the spray-dried products to 300 °C, which convert them to BaTi4O9 and PbxBa1xTi4O9 directly. PbxBa1xTi4O9 (x ≧ 0.1) are low temperature, metastable phases and have not been reported before. Pb0.5Ba0.5Ti4O9 is unstable above 800 °C and cannot be sintered. All PbxBa1xTi4O9 compositions will decompose by 1300 °C, the temperature for solid state synthesis of BaTi4O9. Single-phase PbxBa1xTi4O9 (x = 0.1, 0.2, 0.3, 0.4), however, have been sintered at relatively lower temperatures.

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Articles
Copyright
Copyright © Materials Research Society 1996

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References

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