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Barium titanate/noble metal laminates prepared by the oxidation of solid metallic precursors

Published online by Cambridge University Press:  03 March 2011

M.M. Antony  and
K.H. Sandhage
M.M. Antony
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210-1179
K.H. Sandhage
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210-1179
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Abstract

A novel and attractive method for preparing multicomponent electronic ceramics and ceramic-metal composites is the oxidation of solid metallic precursors (SMP). This metallurgical processing route consists of the following steps: (i) preparation of a solid metallic precursor containing the proper ratio of elements for the final ceramic or ceramic-metal composite, (ii) compaction and forming of the metallic precursor into a desired shape, and (iii) oxidation to produce a monolithic ceramic or ceramic-metal composite. While the SMP method has been used to prepare wires and tapes containing a variety of superconducting oxides, this method has not been widely used to synthesize other electronic ceramics. In this paper, the synthesis of dielectric BaTiO3/noble metal laminates from solid metallic precursors is discussed. Ba–Ti precursor powders have been produced by solid-state mechanical alloying. The precursor powder was sealed inside noble metal tubes and rolled to form thin Ba–Ti/noble metal laminates. Exposure of the Ba–Ti core in such tapes to temperatures ≥ 300 °C in pure oxygen resulted in rapid oxidation. Post-oxidation annealing at elevated temperatures (≥900 °C) yielded dielectric BaTiO3/Ag or BaTiO3/Pd laminates.

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Articles
Information
Journal of Materials Research , Volume 8 , Issue 11 , November 1993 , pp. 2968 - 2977
Copyright
Copyright © Materials Research Society 1993

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