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Porous, Functionally Gradient Pyroelectric Materials.

By Christopher P. Shaw, Roger W. Whatmore and Jeffrey R. Alcock

Abstract

Properties of a new type of pyroelectric ceramic structure containing a layer of known porosity laminated between two dense layers, to form a functionally gradient material (FGM), are reported. The combination of theoretical models for pyroelectric, dielectric, and thermal properties gave a model for the pyroelectric voltage figure of merit (FV) in good agreement with experiment, which had shown a 20% improvement for an introduced central layer porosity of 27%. Preliminary pyroelectric responsivity measurements on FGM infrared detectors indicated an even better improvement. It is postulated that this is due to the porous layer acting as a thermal barrier in the structure

Publisher: Blackwell Publishing
Year: 2007
DOI identifier: 10.1111/j.1551-2916.2006.01373.x
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/1391
Provided by: Cranfield CERES
Journal:

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