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The effects of porosity, electrode and barrier materials on the conductivity of piezoelectric ceramics in high humidity and dc electric field

The effects of porosity, electrode and barrier materials on the conductivity of piezoelectric ceramics in high humidity and dc electric field
The effects of porosity, electrode and barrier materials on the conductivity of piezoelectric ceramics in high humidity and dc electric field
Prolonged operation of piezoelectric ceramic devices under high dc electric fields promotes leakage currents between the electrodes. This paper investigates the effects of ceramic porosity, edge conduction and electrode materials and geometry in the development of low resistance conduction paths through the ceramic. Localized changes in the ceramic structure and corresponding microscopic breakdown sites are shown to be associated with leakage
currents and breakdown processes resulting from prolonged operation in harsh environments. The role of barrier coatings in mitigating the effects of humidity is studied, and results are presented on improved performance using composite diamond-like carbon/polymer coatings.
In contrast to the changes in the electrical properties of the ceramic, the measurements of the piezoelectric properties showed no significant effect of humidity.
electronics and devices, condensed matter electrical magnetic and optical, surfaces interfaces and thin films, chemical physics and physical chemistry
Cain, M.G
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Weaver, P.M.
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Stewart, M.
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Anson, A.
22a92893-b8b9-486e-91c5-90c024cc939d
Franks, J.
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Lipscomb, I.P.
bb93c4d9-33b7-4323-9e3c-8922d13994cc
McBride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770
Zheng, D.
6866b5ef-f49f-4d32-b591-e4423481b926
Swingler, J.
c6e2a49e-fadd-4f38-99f7-0ee1e2c92fac
Cain, M.G
08a41388-ecb8-4fb4-9659-d113ed952ae4
Weaver, P.M.
649cbff1-3909-4d09-bab6-79ef325089d0
Stewart, M.
5c99c553-ecbb-46e2-8806-60fa19f11b02
Anson, A.
22a92893-b8b9-486e-91c5-90c024cc939d
Franks, J.
ff7a1b01-966a-4dfd-a882-432e7368fa74
Lipscomb, I.P.
bb93c4d9-33b7-4323-9e3c-8922d13994cc
McBride, J.W.
d9429c29-9361-4747-9ba3-376297cb8770
Zheng, D.
6866b5ef-f49f-4d32-b591-e4423481b926
Swingler, J.
c6e2a49e-fadd-4f38-99f7-0ee1e2c92fac

Cain, M.G, Weaver, P.M., Stewart, M., Anson, A., Franks, J., Lipscomb, I.P., McBride, J.W., Zheng, D. and Swingler, J. (2012) The effects of porosity, electrode and barrier materials on the conductivity of piezoelectric ceramics in high humidity and dc electric field. Smart Materials and Structures, 21 (4). (doi:10.1088/0964-1726/21/4/045012).

Record type: Article

Abstract

Prolonged operation of piezoelectric ceramic devices under high dc electric fields promotes leakage currents between the electrodes. This paper investigates the effects of ceramic porosity, edge conduction and electrode materials and geometry in the development of low resistance conduction paths through the ceramic. Localized changes in the ceramic structure and corresponding microscopic breakdown sites are shown to be associated with leakage
currents and breakdown processes resulting from prolonged operation in harsh environments. The role of barrier coatings in mitigating the effects of humidity is studied, and results are presented on improved performance using composite diamond-like carbon/polymer coatings.
In contrast to the changes in the electrical properties of the ceramic, the measurements of the piezoelectric properties showed no significant effect of humidity.

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Published date: 20 March 2012
Keywords: electronics and devices, condensed matter electrical magnetic and optical, surfaces interfaces and thin films, chemical physics and physical chemistry
Organisations: Engineering Science Unit

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Local EPrints ID: 336441
URI: https://eprints.soton.ac.uk/id/eprint/336441
PURE UUID: a3e4e5e4-a7ae-4626-85b9-f3e9ac2745ee

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Date deposited: 26 Mar 2012 14:21
Last modified: 23 Sep 2019 18:57

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