Elasticity of single-crystal MgF2 (rutile structure) under pressure

Details Elasticity of single-crystal MgF2 (rutile structure) under pressure Elasticity of single-crystal MgF2 (rutile structure) under pressure

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..34..300d&link_type=abstract

Earth and Planetary Science Letters, Volume 34, Issue 2, p. 300-306.

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The elastic moduli of single-crystal MgF2 (rutile structure) have been measured ultrasonically to 7 kbars. Zero-pressure moduli are in good agreement with the results of others. The pressure derivative of the shear modulus cs = (c11 - c12)/2 is -0.7 +/- 0.1 which is consistent with the negative values also found in rutile-structure oxides. Estimates of the isotropic aggregate modulus derivatives are in good agreement with derivatives measured on polycrystalline aggregates by Rai and Manghnani. The calculated isotropic aggregate bulk modulus derivative is K' = 5.1 +/- 0.2, which is lower than for the rutile-structure oxides, and comparable to that for other fluorides. More covalent bonding may increase the value of K', and hence the value for stishovite (SiO2, rutile) may be quite high. Present address: Department of Geological Sciences, The University of Rochester, Rochester, N.Y. 14627, U.S.A.

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