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Studies of Bi4−xGdxTi3O12 Bifunctional Material

Published online by Cambridge University Press:  01 February 2011

Maharaj S. Tomar
Affiliation:
mtomar@uprm.edu, University of Puerto Rico, Physics, Post Street, Mayaguez, PR, 00681-9016, Puerto Rico, (787) 832-4040, ext.2011, 787-832-3512
Ricardo E. Melgarejo
Affiliation:
mtomar@uprm.edu
Rahúl Singhal
Affiliation:
mtomar@uprm.edu
Luis M. Angelats
Affiliation:
mtomar@uprm.edu
Ram S. Katiyar
Affiliation:
mtomar@uprm.edu
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Abstract

Gadolinium-substituted Bi4Ti3O12 (i.e. Bi4−xGdxTi3O12) were synthesized by sol-gel process for different compositions, and thin films were deposited on Pt (Pt/TiO2/SiO2/Si) substrate by spin coating. Post annealed films at 700° C were investigated for their structural properties using x-ray diffraction and Raman spectroscopy indicating solid solution for compositions: x = 0.00, 0.46, 0.56, and 0.85 where Bi ion is replaced by Gd-ion. Sol-gel derived Pt/Bi4−xGdxTi3O12 film/Pt capacitor structure was tested for dielectric, ferroelectric, and leakage current responses. Films showed ferroelectricity with polarization, Pr = 22 µC/cm2 for composition: x = 0.46. Magnetic response of the powder sample for composition: x = 0.85 was tested using SQUID, which showed superparamagnetic at room temperature and magnetic at 5 K with magnetic coercivity (Hc) = 29 Oe and very small remanance (σr) = 5.4 × 10−4 emu/g.

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Research Article
Copyright
Copyright © Materials Research Society 2006

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