207Pb NMR of PbZrO3 and PbZr1-xTixO3 solid solutions

Paolo Rossi, Matthew R. Dvorak, Gerard S. Harbison

Research output: Contribution to journalConference article

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 η = 0.08 at 200°C. Powder pattern singularities become less distinct near the phase transitions, hut 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.

Original languageEnglish (US)
Pages (from-to)GG3211-GG3216
JournalMaterials Research Society Symposium - Proceedings
Volume658
StatePublished - Dec 1 2001
EventSolid - State Chemistry of Inorganic Materials III - Boston, MA, United States
Duration: Nov 27 2000Nov 30 2000

Fingerprint

Solid solutions
solid solutions
Phase transitions
Nuclear magnetic resonance
nuclear magnetic resonance
Lead
Tensors
tensors
solid state
Temperature
Chemical shift
symmetry
Shielding
Powders
temperature
shielding
chemical equilibrium
asymmetry
temperature dependence
nuclei

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

207Pb NMR of PbZrO3 and PbZr1-xTixO3 solid solutions. / Rossi, Paolo; Dvorak, Matthew R.; Harbison, Gerard S.

In: Materials Research Society Symposium - Proceedings, Vol. 658, 01.12.2001, p. GG3211-GG3216.

Research output: Contribution to journalConference article

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N2 - 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 η = 0.08 at 200°C. Powder pattern singularities become less distinct near the phase transitions, hut 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.

AB - 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 η = 0.08 at 200°C. Powder pattern singularities become less distinct near the phase transitions, hut 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.

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