Physics and Chemistry of Minerals

, Volume 18, Issue 5, pp 294–301 | Cite as

Thermal expansion of SrZrO3 and BaZrO3 perovskites

  • Yusheng Zhao
  • Donald J. Weidner


High-temperature X-ray diffraction studies of SrZrO3 and BaZrO3 perovskites have been carried out to 1200° C. The diffraction patterns are analyzed with Rietveld method so as to refine the unit cell dimensions. The volumetric thermal expansion coefficient are observed to be 2.98*10-5K-1 for orthorhombic Pbnm phase, 3.24*10-5K-1 for orthorhombic Cmcm phase, 3.75*10-5K-1 for tetragonal I4/mcm phase of SrZrO3 perovskite, and 2.06*10-5K-1 for cubic Pm3m phase of BaZrO3 perovskite, respectively. The linear thermal expansion coefficients of SrZrO3 perovskite show considerable anisotropy of α a c b for orthorhombic Pbnm phase, which reflect the decrease of distortion of the perovskite. It is demonstrated that thermal expansion of the centrosymmetrically distorted ABX3 perovskite can be empirically expressed as a combination of the changes of [B-X] bond length and tilting angle of BX6 octahedral framework. The octahedral tilting is considered to be the primary order parameter for the ferroelastic type of structural phase transitions in perovskite. Thermodynamically, the tilting induced volume change denotes the “excess volume” and the corresponding thermal expansion represents the “excess thermal expansion” for the lower symmetry phase with respect to its prototype of the cubic perovskite.


Thermal Expansion Perovskite Thermal Expansion Coefficient Structural Phase Transition Linear Thermal Expansion 
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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Yusheng Zhao
    • 1
  • Donald J. Weidner
    • 1
  1. 1.Center for High Pressure Research, Mineral Physics Institute, Department of Earth and Space SciencesState University of New York at Stony BrookStony BrookUSA

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