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Lead Scandium Tantalate Thin Films for Thermal Detectors

Published online by Cambridge University Press:  25 February 2011

A. Patel ,
N.M. Shorrocks  and
R.W. Whatmore
A. Patel
Affiliation:
Gec-Marconi Materials Technology Ltd Caswell, Towcester, Northants, NN12 8EQ, UK
N.M. Shorrocks
Affiliation:
Gec-Marconi Materials Technology Ltd Caswell, Towcester, Northants, NN12 8EQ, UK
R.W. Whatmore
Affiliation:
Gec-Marconi Materials Technology Ltd Caswell, Towcester, Northants, NN12 8EQ, UK
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Abstract

Thin films of lead scandium tantalate (Pb(Sc½Ta½)03) (PST) have been prepared by a novel modified sol-gel process. The process involves two deposition steps. In the first, layers of amorphous ScTaO4 are deposited by spin coating a solution of metallorganic compounds of scandium and tantalum. A film of lead oxide is then deposited onto the surface using a solution of lead acetate, and the process repeated to obtain thicker films. After firing the composite film, a pale yellow transparent film of PST is obtained. The films are highly orientated and 100% perovskite.

The film's electrical properties have been measured against field and temperature, showing a strong induced pyroelectric response (peak value of 3.8 x 10−3C/m2K), peak permittivities of 4500 and low loss. The figure-ofmerit of these films (11 x 10−5Pa−½) indicates a performance equivalent to conventional bulk ceramic pyroelectric wafers prepared by slicing, lapping and polishing of ceramic blocks.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 243: Symposium G – Ferroelectric Thin Films II , 1991 , 67
Copyright
Copyright © Materials Research Society 1992

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