Phase transformations and elasticity in rutile-structured difluorides and dioxides

Details Phase transformations and elasticity in rutile-structured difluorides and dioxides Phase transformations and elasticity in rutile-structured difluorides and dioxides

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...23..276m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 23, Issue 4, p. 276-285.

Physics

6

Scientific paper

Pressure-induced phase transformations in each of the rutile-structured difluorides (NiF2, MgF2, CoF2, ZnF2, FeF2 and MnF2) exhibit unique behavior; however, a general trend is found in the major structural changes: rutile phase --> ``distorted fluorite'' phase --> post-``distorted fluorite'' phase with volume changes of about 5-10%. For a given phase transformation sequence found commonly in two or more difluorides, the phase transformation pressure is related inversely to the unit cell volume and thus inversely to the mean cation-anion bond length. The relationship in oxides (SnO2, TiO2 and GeO2) is much less systematic. It is therefore not possible to predict without uncertainty the post-stishovite phases in the lower mantle.
Velocity-density systematics in the difluorides and oxides are governed, to a large extent, by cationic radius. The pressure dependence of shear elastic constant CS = (C11 - C12)/2 is negative in all of the nine difluorides and oxides. However, the CS mode does not vanish at the initial phase transformation pressure; rather, the ratios of CS/KS are 0.10 and 0.04 to 0.10 for transitions of rutile --> orthorhombic and of rutile --> ``distorted fluorite'', respectively, and are in agreement with the approach of Demarest et al.

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