نتایج جستجو برای: mixed oxides
تعداد نتایج: 240683 فیلتر نتایج به سال:
X-ray absorption spectroscopy and vacuum ultra-violet spectroscopic ellipsometry are used to study the electronic structure of complex oxides comprised of mixed TM/TM and TM/RE oxides. Experimental spectra for HfTiO4 and Gd(Dy)ScO3 indicate multiple d-state features in the O K1 edge. These are compared with the empirical models for atomic d-state mixing. It is concluded that a mean field, virtu...
Layered transition metal oxides are promising materials for high-energy lithium-ion battery cathodes. These materials offer high capacity and rate capability, good safety, and relatively low cost compared to many alternative materials [1]. Mixed oxides such as NCA (LiNi0.8Co0.15Al0.05O2) exhibit high capacity but suffer from a significant capacity fade with cycling [2]. The composition of alter...
This paper uses X-ray absorption spectroscopy and vacuum ultra-violet spectroscopic ellipsometry to study the electronic structure of high-k transition metal (TM) oxide gate dielectrics. The results are applicable to TM and rare earth (RE) silicate and aluminate alloys, as well as complex oxides comprised of mixed TM/TM and TM/RE oxides. These studies identify the nature of the lowest conductio...
The interaction of vanadium oxide and niobium oxide with A1203 and TiO2 supports is examined with Raman spectroscopy. The Raman spectra of the supported metal oxides reveal that the strong interaction of the metal oxides with AI203 and TiO2 supports results in the formation of two-dimensional surface metal oxide overlayers. The surface vanadium oxide overlayers are unstable to high calcination ...
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