Structure and magnetic properties of vanadium-sodium silicate glasses
UNSPECIFIED. (2003) Structure and magnetic properties of vanadium-sodium silicate glasses. JOURNAL OF NON-CRYSTALLINE SOLIDS, 318 (1-2). pp. 193-201. ISSN 0022-3093Full text not available from this repository.
Vanadium-sodium silicate glasses with the chemical composition [(V2O5)x(Na2O)0.30(SiO2)(0.70-x)] (0.0 less than or equal to x less than or equal to 0.10) have been studied by X-ray photoelectron spectroscopy (XPS) and magnetization measurements. The core-level binding energies of O 1s, V 2p and Si 2p in these glasses have been measured for surfaces produced by in vacuo fracture. The peak position and width of the V 2p(3/2) peak are independent of the V2O5 content while the 0 Is core-level spectra show significant composition-dependent changes. Two distinct peaks are resolvable arising from the bridging oxygen and non-bridging oxygen (NBO) atoms in the silicate glasses. The fraction of NBO, determined from these spectra is found to increase with increasing V2O5 content in the glass and are consistent with the formation of predominantly alkali metavanadate species. The magnetic susceptibility data of these glasses indicate a large, temperature-independent V4+ diamagnetic contribution arising from the glass matrix as well as small paramagnetic contribution from the ions. The V4+ content deduced from the magnetization results (similar to2%) is below the detection limit of XPS analysis. (C) 2002 Elsevier Science B.V. All rights reserved.
|Item Type:||Journal Article|
|Subjects:||T Technology > TP Chemical technology
T Technology > TA Engineering (General). Civil engineering (General)
|Journal or Publication Title:||JOURNAL OF NON-CRYSTALLINE SOLIDS|
|Publisher:||ELSEVIER SCIENCE BV|
|Official Date:||1 April 2003|
|Number of Pages:||9|
|Page Range:||pp. 193-201|
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