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207Pb NMR of PbZrO3 and PbZr1-xTixO3 Solid Solutions

Published online by Cambridge University Press:  18 March 2011

Paolo Rossi ,
Matthew R. Dvorak  and
Gerard S. Harbison
Paolo Rossi
Affiliation:
Chemistry Dept., University of Nebraska, Lincoln, NE 68588-0304
Matthew R. Dvorak
Affiliation:
Chemistry Dept., University of Nebraska, Lincoln, NE 68588-0304
Gerard S. Harbison
Affiliation:
Chemistry Dept., University of Nebraska, Lincoln, NE 68588-0304
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Abstract

PbZrO3 undergoes a phase transition to a paraelectric phase at 230°C. During this phase transition the unit cell changes from orthorhombic to cubic. Structural changes of PbZrO3 have been monitored using solid state NMR by measuring the variation in the 207Pb chemical shielding tensor as a function of temperature. The two distinct lead sites show rather different behavior as a function of temperature. The less shielded lead maintains an almost constant asymmetry parameter η = 0.2 from 0°C to 200°C while the more shielded lead resonance becomes more axially symmetric as the temperature is raised going from η = 0.24 at 0°C to [.eta] = 0.08 at 200°C. Powder pattern singularities become less distinct near the phase transitions, but the temperature dependence of the chemical shift tensor principal values remains continuous, and there is no evidence of an intervening higher-symmetry phase. At the phase transition, both resonances collapse into a single narrow line characteristic of a nucleus at a high-symmetry site. Results of a preliminary study of the PbZr1−xTixO3 solid solutions by 207Pb solid state NMR are also presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG3.21
Copyright
Copyright © Materials Research Society 2001

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