The crystallochemical characterization of magnetic spinels prepared from aqueous solution has been studied primarily by electron microscopy and 5 Fe Mossbauer spectroscopy. . Two synthetic routes investigated : 7Fe have been t : method 1; partial oxidation of Fell solutions " in the presence of NO;; at 100°C, O C , and method 2; reaction of hydrated Fe oxide (ferrihydrite) with Fell ions at roo...

Reactive oxygen species (ROS) are considered to be responsible for the high catalytic activity of transition metal oxides like Co3-xFexO4 in oxidation reactions, but detailed influences catalyst composition and morphology on formation these reactive not fully understood. In presented study, Co3O4 spinels different mesostructures, i.e., particle size, crystallinity, specific surface area, charac...

Ophiolite magnesite deposits are among the main sources of magnesite, a raw material critical for EU. The present work focuses on occurrences at Kymasi (Evia Island, Greece), in close spatial association with chromitite within same peridotite massif, and relationship between ultramafic rocks late veins. Chromitite lenses hosted dunite, contact partially serpentinized cut by Close to veins, show...

Spinel-type Li0.64Fe2.15Ge0.21O4, lithium diiron(III) germanium tetra-oxide, has been formed as a by-product during flux growth of an Li-Fe-Ge pyroxene-type material. In the title compound, lithium is ordered on the octa-hedral B sites, while Ge(4+) orders onto the tetra-hedral A sites, and iron distributes over both the octa-hedral and tetra-hedral sites, and is in the trivalent state as deter...

Because of economics, petroleum coke sometimes replaces or supplements coal as a fuel in power plant combustors. Fly ashes were recovered from the combustion of petroleum coke with moderateto high-sulfur Illinois Basin bituminous coal in a western Kentucky power plant. The fly ashes primarily consist of glass, quartz, mullite and spinels. When compared with ordinary fly ashes from Illinois Basi...

plagioclase and spinels in LAR 06319. Fig. 1: Thin-section photomicrograph of LAR 06319, 37, in transmitted light. Olivine-Phyric Shergottite LAR 06319: Its relation to the enriched components in Martian basalts. A. Basu Sarbadhikari 1,2 , J.M.D. Day 3 , Y. Liu 1 , and L.A. Taylor 1 ; 1 Planetary Geosciences Institute, Dept. of Earth & Planetary Sciences, Univ. of Tennessee, Knoxville, TN 37996...