نتایج جستجو برای: mgal2o4 spinel
تعداد نتایج: 4056 فیلتر نتایج به سال:
Measurements of the grain boundary character distribution in MgAl2O4 (spinel) as a function of lattice misorientation and boundary plane orientation show that at all misorientations, grain boundaries are most frequently terminated on {111} planes. Boundaries with {111} orientations are observed 2.5 times more frequently than boundaries with {100} orientations. Furthermore, the most common bound...
Thermochemical and compressibility data are used to calculate the approximate pressures and temperatures required for the reaction of clinoenstatite to Mg•SiO• (spinel or olivine) or to periclase and stishovite, the reaction of forsteritc to Mg•SiO• (spinel) or periclase and stishovite, and the breakdown of Mg•SiO• (spinel) to periclase and stishovite. The calculated reaction lines for Mg•SiO• ...
Geologists usually deal with rocks that are up to several thousand million years old. They try to reconstruct the tectonic settings where these rocks were formed and the history of events that affected them through the geological time. The spinel group minerals provide useful information regarding the geological environment in which the host rocks were formed. They constitute excellent indicato...
Evidence for Rapid Growth of Melilite in an Unusual Compact Type a Refractory Inclusion from Allende
Compact Type A (CTA) inclusions are extremely melilite-rich (typically ~90 vol%), with moderate amounts of spinel and minor fassaite and perovskite. Because CTAs are one of the major types of coarsegrained inclusions found in CV3 chondrites but have not been thoroughly studied as a group, we have undertaken a comprehensive petrographic, mineralchemical, and trace element study of a large suite ...
Abstract Knowledge concerning powder degradation during additive manufacturing (AM) processing is essential to improve the reusability of in AM and hence maximize feedstock reuse economy process. AlSi10Mg Concept Laser XLINE 2000R machine over total period 30 months was analyzed order understand extent mechanism affecting aging. Thereby, detailed analysis morphology, microstructure surface chem...
This paper reports on an investigation into the effects of different multi-element oxide nanofillers structure and dielectric properties polypropylene (PP)-based nanocomposites. Magnesium aluminate (MgAl2O4), calcium carbonate (CaCO3) surface-modified (CaCO3T) have been added to PP determine their thermal properties, structural changes, response breakdown strength. The results show that nanocom...
TWO different spinels, analyses of which are given, occur in the layered ultramafic rocks at Dawros. Chrome spinel occurs both as gravity-stratified cumulates and as complex orbs, while an Al-rich spinel is both in rocks of the main Dawros magmatic sequence and in an association with an aluminous bronzite, which may originate by recrystallization. It is concluded that while the chrome spinel is...
Spinels from cumulus and non-cumulus members of the 0thris ophiolite display a considerable variation in composition. Cumulus pierites and gabbros contain either a primary chromite and/or a reaction spinel formed by reaction with co-existing sili?ate,-" (Cr--A1 varia tion) or intercumulus liquid (Cr--Fe variation). Non-cumulus peridotites contain spinels which vary along a Cr--A1 trend. Harzbur...
A facile strategy for the design of porous supports was obtained by modifying sol-gel method followed wet impregnation technique. In this respect, herein, acidity γ-Al2O3 phase modulated adding basic MgO, La2O3 or ZnO promoters to form binary supported catalysts. The Ni and Co dispersion on associated with their tunable morphologies resulted in highly alumina-based physicochemical properties so...
Prenucleation refers to the phenomenon of atomic ordering in liquid adjacent a liquid/solid interface at temperatures above its nucleation temperature. It produces precursor for heterogeneous and thus has strong influence on process. Oxide particles, including magnesia, spinel, alumina, are inevitably formed during liquid–metal handling casting. They may act as sites potential grain refinement....
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید