Elasticity of single-crystal MgAl2O4 spinel up to 1273 K by Brillouin spectroscopy

V. Askarpour, M. H. Manghnani, S. Fassbender, A. Yoneda

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The adiabatic single-crystal elastic constants, Cij, of stoichiometric magnesium aluminate spinel (MgAl2O4) have been measured up to 1273 K by highresolution Brillouin spectroscopy, using a 6-pass tandem Fabry-Pérot interferometer and an argon ion laser (514.5 nm). Two platelet samples were employed for probing the acoustic phonons along [100] and [110] directions by platelet and backscattering geometries. The measured temperature dependences of the elastic moduli show a distinct anomaly at 923 K in the shear modulus Cs = (C11-C12)/2 (along [110] direction) and the longitudinal modulus C11 (along [100] direction). This anomaly is consistent with the order-disorder phase transition, resulting from the atomic exchange between Mg at the tetrahedral site and Al at the octahedral site, which has been well documented recently (Peterson et al. 1991; Millard et al. 1992) by neutron powder diffraction and 27Al magic-angle spinning NMR. The values of the temperature derivatives of vp, vs, and Ks, in the temperature range 300-923 K, calculated by the Voigt-Reuss-Hill approximation are -0.40ms-1 K-1, -0.26ms-1 K-1, and -1.89 x 10-2GPaK-1.

Original languageEnglish
Pages (from-to)511-519
Number of pages9
JournalPhysics and Chemistry of Minerals
Issue number8
Publication statusPublished - Apr 1 1993

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology


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