نتایج جستجو برای: magnesium aluminate spinel
تعداد نتایج: 42527 فیلتر نتایج به سال:
Article history: Received 18 June 2014 Accepted 7 May 2015 Available online xxxx
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 ...
Ti valence measurements in MgAl2O4 spinel from calcium-aluminum-rich inclusions (CAIs) by X-ray absorption near-edge structure (XANES) spectroscopy show that many spinels have predominantly tetravalent Ti, regardless of host phases. The average spinel in Allende type B1 inclusion TS34 has 87% Ti. Most spinels in fluffy type A (FTA) inclusions also have high Ti valence. In contrast, the rims of ...
This work addresses conflicting results in the literature regarding liquid inclusion agglomeration. To assess whether calcium aluminates do agglomerate steel, laboratory experiments were performed: melting electrolytic iron, deoxidizing melt with aluminum and subsequently treating deoxidation products (alumina magnesia-alumina spinel inclusions). Under conditions, solid spinels alumina inclusio...
The magnesium nanosized ferrite powder with formula MgFe2O4 was synthesized via a pyrochemical sol–gel glycine–nitrate method and annealed consistently at temperatures of up to 1300 °C. samples’ microstructure studied by SEM XRD methods. According the results studies, increase in nanoparticles size from about 15 nm micron-sized particles observed when increasing annealing temperatures. DC elect...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید