David Andersson et al. report calculations revealing how doped oxides with cubic fluorite structures become effective ionic conductors. Cubic fluorite structures, such as ceria (CeO2), can become effective ionic conductors when doped with cations of lesser valence than the host cations. Doped ceria thus has potential as an electrolyte for environmentally friendly solid oxide fuel cells. Anderss...

Fluorite-type Ce0.5Zr0.5O2 and Ce0.5Hf0.5O2 have been synthesized by a solution combustion route, and their oxygen release and reduction have been investigated up to 850 degrees C. On reduction, the zirconium system forms two pyrochlore phases, Ce2Zr2O7 (pyrochlore-I) and Ce2Zr2O6.2 (pyrochlore-II), while the hafnium system forms only a disordered fluorite phase with the composition Ce0.5Hf0.5O...

Fluorite mineralization was studied in the Variscan granitoid Karkonosze pluton northern part of the Bohemian massif (Lower Silesia, Poland). Fluid inclusions fluorite and quartz were investigated by following methods: heating freezing on an immersion microscope stage, spectrophotometric electron probe analysis, calcination water leachate. The parent fluids Na-Ca-Cl type with a low CO₂ content....

Tailoring electrical and mechanical properties in the fluorite oxides family is of great interest for technological applications. Other than doping substitution, entropy-driven stabilization an emerging technique new solid solutions formation enhancing or exploring functionalities. However, there a high number possible combinations higher-order diagram investigations, current state art shows li...

The possibilities of chromatic aberration correction in a hybrid (diffractive-refractive) objective are discussed. It is possible to design a hybrid triplet objective free from chromatic aberration in the wavelength range 0.45–0.85 μm practically covering the whole visible spectrum. To that end one of the lenses should be made of special glass, but not necessarily of fluorite. For illustration ...

Abstract. The Black Forest hosts a wide range of hydrothermal mineralization, including fluorite–barite vein deposits. In detailed investigation the Finstergrund and Tannenboden deposits in Wieden mining district (southern Forest), diversity, geochemical evolution relative chronology multistage fluorite precipitation is tracked on basis rare earth element (REE) geochemistry, geologic field rela...