Quantifying geological processes has greatly benefited from the development and use of thermochronometric methods over the last fifty years. Among them is the (U-Th)/He dating method, which is based on the production and retention, within a crystal structure, of radiogenic 4He atoms associated with the alpha decay of U, Th and Sm nuclei. While apat...
Published in Petrology
New 18O/16O β-factors have been calibrated against temperature for titanite (considering the principal isomorphic substitutions Al + F ⇔ Ti + O, Ti + O ⇔ Al + OH, Ti + O ⇔ Fe3+ + OH) and ilmenite (accounting for Fe ⇔ Mg substitution) for the first time using the frozen-phonon approach of the density functional theory. The equilibrium oxygen isotope...
International audience
International audience
Published in Inorganic Materials: Applied Research
AbstractDuring the interaction of titanite with hydrochloric acid, a composite titanosilicate precipitate (TSP) of the composition TiO2 ⋅ (1.1–1.15) SiO2 ⋅ (0.8–0.85) H2O consisting of two phases is isolated—crystalline titanium dioxide of rutile modification and silica. It has been found that, during high-temperature treatment (850°C), particles o...
Published in Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
The crystal structure of the mineral malayaite has been studied by single-crystal X-ray diffraction at a temperature of 20 K and by calculation of its phonon dispersion using density functional perturbation theory. The X-ray diffraction data show first-order satellite diffraction maxima at positions q = 0.2606 (8) b *, that are absent at room tempe...
Published in Materials
The waste of apatite-nepheline ore processing was chosen as the material of study for the present investigation. The chemical and phase compositions have been analyzed and the route of the new technology has been developed. Treatment of the waste with diluted hydrochloric acid enables to separate apatite, nepheline, titano-magnetite minerals from t...
