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Mineralogical Magazine; December 2001; v. 65; no. 6; p. 709-715; DOI: 10.1180/0026461016560002
© 2001 Mineralogical Society of Great Britain and Ireland
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Spontaneous strain in synthetic titanite, CaTiOSiO4

T. Malcherek*

Institut für Mineralogie, WWU Münster, Corrensstr. 24, 48149 Münster, Germany

* E-mail: malcher{at}nwz.uni-muenster.de

Lattice parameters of synthetic titanite powder, CaTiOSiO4, have been determined between room temperature and 1023 K. Only the e11 and e13 components contribute significantly to the strain tensor associated with the antiferroelectric-paraelectric phase transition at Tc = 487 K. A finite strain component e13 is observed in the paraelectric phase for 487 K < T < 825 K. The disappearance of this shear strain marks the isosymmetric transition near 825 K. The temperature evolution of the volume strain and of e11 is proportional to the squared order parameter observed in single-crystal diffraction experiments. The magnitude of the volume strain is sufficiently large to relate the observed near tricritical behaviour of the antiferroelectric-paraelectric phase transition to strain coupling.

KEYWORDS: titanite, strain, phase transition, lattice parameters




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