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High-temperature Hf-site-interchange chemistry in LiNbO3 and LiTaO3

Published online by Cambridge University Press:  31 January 2011

Dunbar P. Birnie III  and
Gary L. Catchen
Dunbar P. Birnie III
Affiliation:
Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721
Gary L. Catchen
Affiliation:
Department of Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

We explain observed Hf-site interchange in LiNbO3 and LiTaO3 at high temperatures using solid-state defect chemistry reactions. The model takes into account fully the effects of nonstoichiometry on the ferroelectric-to-paraelectric phase transition. Specifically, we use this model to interpret the temperature dependence of the Hf-site interchange that we measured using perturbed-angular-correlation (PAC) spectroscopy. In this context, the site interchange is an equilibrium, thermodynamic process that involves the partitioning of Hf ions between Li and group-V (Nb and Ta) sites. The Hf ions replace group-V ions by pushing them from their normal sites to the Li sublattice. Based on the temperature dependence of the site occupancy, this reaction requires approximately 2.2 to 2.3 eV.

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Articles
Information
Journal of Materials Research , Volume 8 , Issue 6 , June 1993 , pp. 1379 - 1386
Copyright
Copyright © Materials Research Society 1993

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