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Influence Of Cation Vacancies on the Ferroelectric Properties of SBT Doped with Praseodymium

Published online by Cambridge University Press:  26 February 2011

Jorge Mata ,
Alejandro Durán ,
Eduardo Martínez  and
Jesus Siqueiros
Jorge Mata
Affiliation:
[email protected], Universidad Nacional Autónoma de México, Centro de Ciencias de la Materia Condensada, Apdo. Postal 2681, Ensenada, Baja California., Ensenada, 22800, Mexico, 52-646-174-4604 x 353, 52-646-174-4603
Alejandro Durán
Affiliation:
[email protected], Universidad Nacional Autónoma de México, Centro de Ciencias de la Materia Condensada, Apdo. Postal 2681, Ensenada, Baja California., Ensenada, 22800, Mexico, 52-646-174-4604 x 353, 52-646-174-4603
Eduardo Martínez
Affiliation:
[email protected], Universidad Nacional Autónoma de México, Centro de Ciencias de la Materia Condensada, Apdo. Postal 2681, Ensenada, Baja California., Ensenada, 22800, Mexico, 52-646-174-4604 x 353, 52-646-174-4603
Jesus Siqueiros
Affiliation:
[email protected], Universidad Nacional Autónoma de México, Centro de Ciencias de la Materia Condensada, Apdo. Postal 2681, Ensenada, Baja California., Ensenada, 22800, Mexico, 52-646-174-4604 x 353, 52-646-174-4603
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Abstract

Dielectric and ferroelectric properties were studied in Sr0.85−yPr0.15VyBi2Ti2O9 polycrystalline samples where cation vacancies were induced. DRX characterization shows that the Aurivillius structure can accept 10% of induced vacancies without precipitation of second phases. Thermoelectric analysis and ferroelectric hysteresis measurements show that the vacancies modify the transition temperature Tc and slightly the polarization values. From the ε-T curves it was observed that the polarization magnitude and Tc are affected as a consequence of the induced vacancies. A broad peak at Tc, typical of the diffuse phase transition behavior of this material was also observed. Furthermore, the induced vacancies in praseodymium-modified SBT produce an increased on Tc from ∼180 to ∼240 °C, these facts show that induced vacancies in the structure are a tuning mechanism for the dielectric and ferroelectric properties.

Keywords

ferroelectricthermoelectricitydielectric properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T07-08
Copyright
Copyright © Materials Research Society 2007

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References

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