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Stability of $Fe^{3+} — V_O$ defect pairs in polycrystalline $Pb(Ti,Zr)O_3$

Kutty, TRN and Balachandran, R (1985) Stability of $Fe^{3+} — V_O$ defect pairs in polycrystalline $Pb(Ti,Zr)O_3$. In: Materials Chemistry and Physics, 13 (5). pp. 467-475.

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Abstract

The intensity of the EPR signal with g = 5.985 arising from a ferric ion - oxygen vacancy defect pair $(Fe^{3+}- V_0)$ in $PbTio_3$, varies with the extent of PbO nonstoichiometry at constant $Fe^{3+}$ content due to an increased oxygen vacancy concentration. In PZT solid solutions, the signal intensity decreases with an increase in Zr. A lower intensity is also noticed for $Fe^{3+}$-V_0$. signals in $PbZro_3$. This behaviour is explained on the basis of PbO nonstoichiometsy arising from independent Pb- and o-vacancies as well as the randomly distributed crystallographic shear (CS) plane defects. The contribution to Pbo nonstoichiometry from CS planes is larger in high zirconium compositions of PZT.

Item Type: Journal Article
Additional Information: Copyright belongs to Elsevier
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: RM Shivakumara
Date Deposited: 04 Jul 2008
Last Modified: 19 Sep 2010 04:46
URI: http://eprints.iisc.ac.in/id/eprint/14784

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