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Optically Induced Paramagnetic Defects in PbTiO3 Single Crystals

Published online by Cambridge University Press:  21 February 2011

W.L. Warren ,
B.A. Tuttle ,
B.N. Sun ,
Y. Huang  and
D.A. Payne
W.L. Warren
Affiliation:
Glass and Electronic Ceramics Department, Sandia National Laboratories Albuquerque, NM 87185
B.A. Tuttle
Affiliation:
Glass and Electronic Ceramics Department, Sandia National Laboratories Albuquerque, NM 87185
B.N. Sun
Affiliation:
Department of Materials Science and Engineering, Materials Research Laboratory, and Beckman InstituteUniversity of Illinois at Urbana-Champaign, Urbana, IL 61801
Y. Huang
Affiliation:
Department of Materials Science and Engineering, Materials Research Laboratory, and Beckman InstituteUniversity of Illinois at Urbana-Champaign, Urbana, IL 61801
D.A. Payne
Affiliation:
Department of Materials Science and Engineering, Materials Research Laboratory, and Beckman InstituteUniversity of Illinois at Urbana-Champaign, Urbana, IL 61801
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Abstract

Optical excitations for trivalent platinum (5d7, t6e) and trivalent Pb (6s1) ions in lead titanate single crystals have been observed for the first time by electron paramagnetic resonance (EPR). The g and hyperfine coupling, A, tensors of Pt+3 defects were found to be axial: gil∥ = 1.938, g⊥ = 2.478, A∥ = 0.0164 cm−1, and A⊥ = 0.0324 cm−1. Analysis of the EPR spectra by crystal field theory indicates that the Pt+3 ions are in tetragonally distorted (elongated) octahedral sites, strongly suggesting that they substitute for the central Ti+4 ions in the perovskite lattice. Axially symmetric Fe+3 impurities were also observed in the crystals, and they also appear to substitute for the Ti+4 cation. Identification of Pb+3 in these single crystals further shows that holes trapped at Pb+2 ions are an inherent feature of Pb-based perovskite ferroelectrics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 310: Symposium N – Ferroelectric Thin Films III , 1993 , 391
Copyright
Copyright © Materials Research Society 1993

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