A Two Order Parameter Thermodynamic Model for Pb(Zr1-xTix)O3

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概要

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• A two order parameter thermodynamic model is proposed which accounts for a number of features of the solid solution system Pb(Zr1-xTix)O3 not predicted by the conventional 6th order model. The free energy comprises three sets of terms: two expansions of polarization, representing contributions to the polarization of each of the solid solution end-members, weighted linearly with respect to composition, plus terms representing the coupling between the two contributions. Employing previously published coefficients for PbTiO3 and values extrapolated from Zr-rich PZT compositions for PbZrO3, calculations predict that the composition of the morphotropic phase boundary between the rhombohedral and tetragonal phases lies at $x=0.45$ and is independent of the strength of coupling between the two order parameters. The model allows for the existence of a monoclinic phase, the composition range of which depends upon the strength of the coupling terms. A satisfactory fit to the lattice parameters of Pb(Zr0.52Ti0.48)O3 is obtained over a wide range of temperature.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2003-12-15

著者

• Bell Andrew

  Institute For Materials Research The University Of Leeds

• Furman Eugene

  Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802

• Furman Eugene

  Materials Research Institute The Pennsylvania State University

関連論文

• Shift in Morphotropic Phase Boundary in La-Doped BiFeO3–PbTiO3 Piezoceramics
• A Two Order Parameter Thermodynamic Model for Pb(Zr1-xTix)O3

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