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A Modified SBN System for Pyroelectric Sensors

Published online by Cambridge University Press:  21 March 2011

H. Amorín ,
F. Guerrero ,
J. Portelles ,
M. Venet ,
A. Fundora  and
J. M. Siqueiros
H. Amorín
Affiliation:
Facultad de Física - Instituto de Materiales y Reactivos, Universidad de la Habana, Vedado, La Habana 10400, Cuba
F. Guerrero
Affiliation:
Facultad de Ciencias Naturales, Universidad de Oriente, Santiago de Cuba 90500, Cuba
J. Portelles
Affiliation:
Facultad de Física - Instituto de Materiales y Reactivos, Universidad de la Habana, Vedado, La Habana 10400, Cuba
M. Venet
Affiliation:
Facultad de Física - Instituto de Materiales y Reactivos, Universidad de la Habana, Vedado, La Habana 10400, Cuba
A. Fundora
Affiliation:
Facultad de Física - Instituto de Materiales y Reactivos, Universidad de la Habana, Vedado, La Habana 10400, Cuba
J. M. Siqueiros
Affiliation:
Centro de Ciencias de la Materia Condensada, UNAM, Apartado Postal 2681, Ensenada, B.C., México, 22800
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Abstract

The Thermally Stimulated Depolarization Current (TSDC) and pyroelectric properties of the modified SBN ferroelectric ceramic system were studied for different lanthanum and titanium doping concentrations. The TSDC measurements show the pyroelectric peak for all compositions while a second smaller peak at higher temperature, possibly associated to induced vacancy-impurity dipoles, is also observed in all cases. The second peak contribution was experimentally and mathematically eliminated to determine the remanent polarization and pyroelectric coefficient, both associated only to permanent ferroelectric dipoles. The figures of merit for sensor devices are determined for all compositions and compared with those of other pyroelectric systems. The La0.03Sr0.255Ba0.7 Nb1.95Ti0.05O5.975 sample, in particular, has excellent pyroelectric response, making this material very suitable for pyroelectricity-derived applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 655 , 2000 , CC11.11.1
Copyright
Copyright © Materials Research Society 2001

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