Tungsten skarns today represent >40% of the global tungsten reserves although their processing is usually difficult due to fine textures, low grade, and complex mineralogical association. Notably, selective flotation scheelite from gangue calcium minerals, particularly fluorite, using fatty acids still remains an industrial scientific challenge. In present work, we investigated influence pH, ch...

This review summarizes the progress on basic understanding and applications of volume transport protons in fluorite pyrochlore oxides, discusses present problems challenges ahead.

The title compound, penta-strontium tris-[penta-fluorido-oxido-vanadate(IV)] fluoride trihydrate, was obtained under hydro-thermal conditions. Its crystal structure has been refined from intensity data of a non-merohedrally twinned crystal. Two domains in almost equal proportions are related by a -180° rotation along the reciprocal [101]* vector. The structure may be considered as a derivative ...

Ferroelectric SrBi2(Ta12xNbx)2O9 ~SBNT! thin films were deposited on Pt/TiOx /SiO2 /Si substrates at various substrate temperatures by the pulsed laser ablation deposition method. X-ray diffraction shows that the film has a fluorite structure at a substrate temperature of 500 °C. The fluorite structure was transformed into perovskite phase at 550 °C and was fully crystallized at temperatures >7...