نتایج جستجو برای: spinels
تعداد نتایج: 526 فیلتر نتایج به سال:
Mantle-melt evolution processes in the earliest stage of subduction initiation (SI) are still ambiguous. Here, we report systematic petrogeochemical and physical records SI demonstrated by Gomsiqe massif, Mirdita ophiolite. The ultramafic body consists basal lherzolites, upper harzburgites containing lentoid dunites disseminated chromitites, displaying transition petrological (Cr# spinels range...
The distribution of V in magmatic rocks is controlled primarily by spinel stability. Extensive previous experimental work at oxidized conditions on doped (V-rich) compositions has led to the recognition of the importance of temperature, oxygen fugacity, and spinel composition, but also left ambiguity with respect to the relative importance of these variables in controlling DV. One major uncerta...
This review summarizes more than 100 years of research on spinel compounds, mainly focusing the progress in understanding their magnetic, electronic, and polar properties during last two decades. Many compounds are magnetic insulators or semiconductors; however, a number spinel-type metals exists including superconductors some rare examples d-derived heavy-fermion compounds. In early days, they...
1Department of Physics, University of Virginia, Charlottesville, VA 22904, USA Advanced Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan 3Department of Advanced Materials, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan 4Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan 5The Institute for Solid State Physics...
An electron paramagnetic resonance (EPR) investigation on Ti-doped MgAl2O4 spinels has been made in order to study the Ti sites. The study we present here concerns the angular dependencies of the Ti EPR lines and the variations of the EPR spectra due to a modification of the TiO2 content or of the chemical composition from MgAl2O4 to MgAl4O7 and MgAl6O10. In all the studied samples except one, ...
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