The concept of the mineral classification in the Mineral Powder Diffraction File (MPDF) is somewhat different from that used in classical mineralogical references. The goal of the classification is to exploit the crystal chemistry characteristics to the fullest to assist in the identification of mineral phases. The primary criterion is the similarity of the diffraction pattern, which results fr...

A semiempirical ansatz to compute anharmonic contributions to the free energy neglected in quasiharmonic calculations is introduced. A parametrized temperature-dependent modification of the vibrational density of states designed to be used directly with the quasiharmonic free-energy expression is proposed. An approximate relationship between the modified frequencies and the renormalized frequen...

Using a novel experimental procedure in the field of ceramics/materials science that is based on the precise microanalysis (scanning electron microscopy, coupled with wavelength-dispersive spectroscopy) of the phases that are present in equilibrated specimens, the solid-state compatibility relations in the subsystem MgAl2O4–CaAl4O7–CaO– MgO and the melting relationships in the subsystems MgAl2O...

Earth Planet. Sci. Lett. 2, 107-113, 1967. Wang, C. Y., Constitution of the lower mantle as evidence from shock wave data for some rocks, J. Geophys. Res., 73, 6459-6476, 196&z. Wang, C. Y., Equation of state of periclase and Birch's relationship between velocity and density, Nature, 218, 74, 19686. Weaver, J. S., Taro Takahashi, and W. A. Bassett, Calculation of the PV relation for the B1 phas...

We investigate the high-pressure phase diagram of the hydrous mineral brucite, Mg(OH)2, using structure search algorithms and ab initio simulations. We predict a high-pressure phase stable at pressure and temperature conditions found in cold subducting slabs in Earth's mantle transition zone and lower mantle. This prediction implies that brucite can play a much more important role in water tran...

In this study, the evaluation of aluminium dross from secondary production in calcium aluminate cement was investigated. Salt compounds were removed significantly by washing. Mixtures washed and quicklime prepared to obtain a additive considering standard with low alumina they sintered at 1250 °C for 5 h. The phases mayenite, monocalcium aluminate, grossite, gehlenite, larnite, periclase spinel...

Periclase (MgO) is the second most abundant mineral after bridgmanite in the Earth's lower mantle, and its melting behaviour under pressure is important to constrain rheological properties and melting behaviours of the lower mantle materials. Significant discrepancies exist between the melting temperatures of MgO determined by laser-heated diamond anvil cell (LHDAC) and those based on dynamic c...