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Showing 1 to 18 of 18 for “"Corundum"”.
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The approach to equilibrium of mixtures of CaO, A1₂O₃, and SiO₂ heated to various temperatures
… and the anorthite-gehlenite-corundum compatibility triangles were fired to 1400° C. The effect on equilibrium of different raw materials used to form the compositions was also studied. Based on the results of the present investigation the following conclusions seem justified: …
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Thermodynamic properties of intermetallics
… hercynite (Fe2AlO4) in a solid-state reaction of corundum (α - Al2O3) and iron. Further, the Al2O3 surface energies of various planes were investigated. In addition, interfaces, which are of experimental interest within CRC 920, were modelled: α - Al2O3 (0001) || Al(111), TiO2 (rutile) || MgTiO3 …
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Magnetic ordering in systems of reduced dimensionality
… of thin films of (111) FCC structures and (0001) corundum structured materials were studied by the mean field analysis and some Monte Carlo simulation. These models were conditioned on a mapping from first principles calculations to the Ising model. The effect of the suggested octopolar …
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Cratonic eclogite xenoliths - formation and evolution of the subcontinental lithospheric mantle
… (gt)-omphacite (cpx)), coesite-, kyaniteand corundum-bearing eclogites. Metasomatized eclogites (Type I) have a higher alkali- (Na2O in garnet and K2O in omphacite) and LREE, LILE-content. Non-metasomatized (Type II) eclogites include two main compositional groups, derived from different …
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Contact metamorphism of the Lucerne pluton, Hancock Co., Maine
… as the result of muscovite reaction with quartz. Corundum occurs at the immediate contact of the granite from the. reaction of the remaining muscovite. The Bucksport formation is recrystallized within the aureole to a purple and green gneiss. The gneissic banding is not present in the low grade …
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MECHANICAL ABRASION AND ELECTROPORATION IN THE TRANSFORMATION OF INTACT PLEUROTUS OSTREATUS HYPHÆ and NUTRIENT-DEPENDANT RESISTANCE TO HYGROMYCIN B
… quickly found to be inappropriately large so a corundum abrasive with an average size of 300 nm was focused on. Vortexing as well as low and medium power ultrasonic agitation with the corundum abrasive were investigated for their potential to cause mechanical degradation of the cell walls. …
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Study of residual stress in a thin platinum layer by means of nondestructive x-ray diffraction
… of thin, sputter-deposited platinum layers on a corundum substrate. Since such thermometers are usually exposed to extreme temperatures, residual stress is building up at the Pt-Ah03 interface and can possibly damage the layer. Therefore, the stress in the layer is measured by means of …
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Influences of Reaction Parameters on the Product of a Geothermite Reaction: A Multi-Component Oxidation-Reduction Reaction Study
… the presence of the chemical species: silicon, corundum (α -Al₂O₃), spinel (MgAl₂O₄), and grossite (CaAl₄O₇). Many additional chemical species were present; their occurrence depended on reaction parameters used during synthesis. Diffraction peaks were observed for phases of aluminum nitride …
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Innovative composite enamel coatings with improved abrasion resistance and mechanical properties
… resistance. Here, the effect of the size of the corundum particles on the abrasion resistance and chemical durability is investigated by means of traditional and accelerated tests. The novelty with respect to the present literature is represented by a complete investigation of the functional …
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EVOLUTION OF THE EASTERN ALPS FROM THE PALEOZOIC ONWARD: CONSTRAINTS AND INSIGHTS FROM THE (ULTRA)BASIC ECLOGITIC COMPLEX OF MILCHENKAR ÖTZTAL-STUBAI COMPLEX (EASTERN ALPS, TYROL, AUSTRIA)
… by the previously unreported occurrence of corundum and Mg-staurolite. In contrast with Variscan age estimates for the high pressure metamorphism (Miller & Thöni, 1995), the newly discovered occurrence of eclogite-hosted leucosomes preliminary dated to 484 Ma (in situ U-Pb on zircon …
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The Bays formation (Middle Ordovician) and related rocks of the southern Appalachians
… hornblende, zoisite, garnet, epidote, and corundum. These clasts and minerals indicate that Bays sediments were derived from older sedimentary rocks, low-grade and high-grade metamorphic rocks, and silicic igneous intrusive rocks. These data suggest that Bays sediments were derived from a …
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Geochemical Evolution at White Island, New Zealand
… in the unhomogenized 1991 melt inclusions is corundum normative, with Si/(Si+Ca+Mg+Fet)>0.91, and K/(K+Ca+Mg+Fet)>0.36, all of which are characteristic of productive systems. Melt inclusions from White Island also show a positive Eu anomaly similar to that found in productive porphyry …
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Melt Synthesis, Structural, Characterization and Scaling of Swelling 2:1-Layer Silicate Materials
… respectively at 900 °C for one hour in a corundum crucible in a chamber furnace. (iii) Mixing and melting the glass, the material obtained by dehydration and decarboxylation of SiO2∙nH2O and MgCO3∙Mg(OH)2 together with magnesium fluoride to achieve a composition of …
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Textural and Chemical Relations Among Spinel-Sapphirine-Garnet-Orthopyroxene, Salt Hill Emery Mine, Cortlandt Complex, N.Y.
… ilmenohematite, sillimanite, and sporadically corundum. During cooling, melt within the xenoliths was injected as cm-scale veinlets into the silica-poor solid residuum. Local increase in silica activity resulted in progressive silication reactions of spinel-rich residuum to several silicates. A …
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SNIC-DSM: SmartNIC based DSM Infrastructure for Heterogeneous-ISA Machines
Heterogeneous computing is increasingly used in today's datacenters to meet the increasing computational demands of applications. Heterogeneous hardware typically includes CPUs, GPUs, ASICs, and FPGAs, among others. An important emerging trend is instructionset- architecture (ISA)-heterogeneity: …
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Proterozoic thermal and deformational history and geochemical evolution of the 1.4 Ga Priest pluton and its aureole
… plutons in North America. The pluton is a corundum normative, peraluminous, K-feldspar megacrystic granodiorite to quartz monzonite. The Priest pluton is characterized by high Mg/Mg+Fe and high abundances of Al2O3, CaO, and large ion lithophile elements (e.g. Zr, Y). Major and trace element …
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The crystal chemistry of hibonite: an indicator for oxygen fugacity during Solar nebula condensation?
… is due to the fact that it is, together with corundum, the very first mineral to condensate in the Solar Nebula. Therefore, as compared to clinopyroxenes, which have formed subsequently, hibonite potentially carries information on the earliest stages of the Solar System formation. However, …
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Association of S-type and I-type granitoids in the Neoproterozoic Cameroon orogenic belt, Bafoussam area, West Cameroon : geology, geochemistry and petrogenesis
… composition by the permanent presence of corundum, ranging between 0.12 and 3.03. The Bafoussam granitoids were emplaced in a syn- to post-collisional tectonic environment. The observed deformational features and the concentrations in Y, less than 40 ppm, confirm that they are related to …