[1] Analysis of high resolution Moon Mineralogy Mapper (M) data reveals the presence of a prominent Mg‐spinel‐rich lithology in the central peaks of Theophilus crater on the lunar nearside. Other peak‐associated lithologies are comprised of plagioclase, olivine, and pyroxene‐bearingmaterials. A consistent spatial association of Mg‐spinel with mafic‐free anorthosite is recognized. Documentation ...

The high voltage spinel LiNi0.5Mn1.5O4 is a promising cathode material in next generation of lithium ion batteries. In this study, LiNi0.5Mn1.5O4 with various particle microstructures are prepared by controlling the microstructures of precursors. LiNi0.5Mn1.5O4 spinel samples with solid, hollow and hierarchical microstructures are prepared with solid MnCO3, hollow MnO2 and hierarchical Mn2O3 as...

Introduction. Nickel-rich spinel is recognized as a cosmic event marker [1-3,5]. Spinel is found in K/T boundary sections all over the world [1-3,14], in lower-middle Jurassic hardground [13], in late Pliocene sediments [4] and in upper Eocene sediments [12]. Its composition is characterized by a high nickel oxide concentration (NiO>1 wt%) and a high iron oxidation state (Fe/Fetot>70 mole%) inv...

available online at http://meteoritics.org 1287 © Meteoritical Society, 2004. Printed in USA. The activity of chromite in multicomponent spinels: Implications for T-fO2 conditions of equilibrated H chondrites Ronit KESSEL,1* John R. BECKETT,1 Gary R. HUSS,2 and Edward M. STOLPER1 1Institute of Earth Sciences, The Hebrew University, Givat-Ra, Jerusalem, 91904, Israel 2Department of Geological Sc...

Nano crystals of γ-Fe2O3 (maghemite) were synthesized by emulsion precipitation method using kerosene as oil phase, SPAN80 (sorbitane monooleate) as the surfactant and sodium hydroxide as the precipitating agent. The characterization of the samples by FTIR (Fourier transform infra-red) and XRD (X-ray diffraction) techniques confirmed the formation of γ-Fe2O3 (maghemite). Analysis by SEM (scanni...

Introduction: Melilite-free, spinel-, hibonitebearing spherules, a major type of refractory inclusion in CM2 chondrites, consist of phases that are predicted by thermodynamic calculations to condense from a cooling gas of solar composition but are not predicted to coexist with each other. Throughout updates and additions to the data base over the years, calculations [e.g. 1-3] consistently show...

With a new type of ion microprobe, the NanoSIMS, we determined the oxygen isotopic compositions of small ( 1 m) oxide grains in chemical separates from two CM2 carbonaceous meteorites, Murray and Murchison. Among 628 grains from Murray separate CF (mean diameter 0.15 m) we discovered 15 presolar spinel and 3 presolar corundum grains, among 753 grains from Murray separate CG (mean diameter 0.45 ...