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Low Temperature Hydrothermal Processing (<100°C) of Stoichiometric BaxSr1-xTiO3 Thin Films and Powders

Published online by Cambridge University Press:  10 February 2011

Ryan K. Roeder  and
Elliott B. Slamovich
Ryan K. Roeder
Affiliation:
School of Materials Engineering, Purdue University, W. Lafayette, IN 47907-1289
Elliott B. Slamovich
Affiliation:
School of Materials Engineering, Purdue University, W. Lafayette, IN 47907-1289
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Abstract

BaxSr1-xTiO3 (BST) thin films and powders were processed below 100°C by hydrolyzing Ti metal-organic precursors and TiO2 powder in alkaline Ba/Sr containing aqueous solutions. Film and powder stoichiometries were examined by x-ray diffraction (XRD), and powder stoichiometries were measured by wavelength dispersive spectroscopy (WDS). Both XRD and WDS results showed that Sr cations were more readily incorporated in BST than Ba cations. A thermodynamic model is introduced to predict BST stoichiometry for pH and solution composition. The model is demonstrated for carbonates that also form hydrothermally with Ba and Sr in solid solution, showing good agreement with experimentally measured stoichiometries and confirming a higher reactivity of the Sr cation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 195
Copyright
Copyright © Materials Research Society 1997

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