Matlab scripts that apply the Bence & Albee (1968) matrix correction algorithm to X-ray intensity data collected as element maps on a Cameca SX-50 microprobe are used to produce two-dimensional maps of oxide weight percent and cation proportions for SiO2, Al2O3, FeO, MnO, MgO, CaO, Na2O and K2O. Once generated, large data sets of mapped oxide weight percent values or cation numbers that retain ...

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During the refining process of Incoloy825 nickel-based alloy, reaction between slag and Al Ti in alloy can result oxidation loss. Therefore, effect TiO2 Al2O3 contents (CaO–SiO2–Al2O3–MgO–CaF2–TiO2) on final was investigated by slag-metal experiment a 1-kg MoSi2 resistance furnace. The thermodynamic model established based ion molecular coexistence theory kinetic two-film theory. experimental r...

We use first principles density functional theory calculations to study the interaction of a model dangling bond silicon tip with the surfaces of CaF2, Al2O3, TiO2, and MgO. In each case the strongest interaction is with the highest anions in the surface. We show that this is due to the onset of chemical bonding with the surface anions, which can be controlled by an electric field across the sy...

We present tunneling experiments on Fe~001!/MgO~20 Å!/FeCo~001! single-crystal epitaxial junctions of high quality grown by sputtering and laser ablation. Tunnel magnetoresistance measurements give 60% at 30 K, to be compared with 13% obtained recently on ~001!-oriented Fe/amorphous-Al2O3 /FeCo tunnel junctions. This difference demonstrates that the spin polarization of tunneling electrons is n...

Nanopowders of Al2O3, TiO2 and MgO were fabricated by high energy ball milling. The simutaneous synthesis and sintering of nanostuctured MgAl2O4-Mg3Al4Ti3O25 composite was investigated by the pulsed current activated sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. A highly dense nanostructure...

2014 Dislocations produced by room temperature Vickers indentation on a single crystal of MgO.1.1 Al2O3 spinel have been characterized by T.E.M. These dislocations belong to 1/2 110 > { 111 } glide systems. No trace of { 100 } nor { 110 } glide is found. Moreover these dislocations show no preferred orientation nor visible dissociation. However after annealing for 1 day at 1 000 °C, dissoc...

Oxygen vacancies in metal oxides are known to determine their chemistry and physics. The properties of neutral oxygen vacancies in metal oxides of increasing complexity (MgO, CaO, alpha-Al2O3, and ZnO) have been studied using density functional theory. Vacancy formation energies, vacancy-vacancy interaction, and the barriers for vacancy migration are determined and rationalized in terms of the ...

2014 Metal-dielectric inhomogeneous media exhibit contrasted physical properties according to the nature of the metallic inclusion : noble or transition. A comparison between Au-MgO and Pt-Al2O3 thin films (prepared by sputtering), based on their optical, electrical and structural properties, is presented. The optical properties are analysed using two effective medium theories : Maxwell Garnett...

The effect of iron oxide content on the crystallisation of a diopside glass–ceramic glaze was investigated using a glass–ceramic frit in the K2O–ZnO–MgO–CaO–Al2O3–SiO2 system and a granite waste glass. Measurements by X-ray diffraction (XRD) combined with scanning electron microscopy (SEM) and EDX microanalysis showed that the distribution of Fe ions among different crystalline phases such as f...