V. Bondarenka et al., Surface chemical composition of MV10Mo2O31 center dot nH(2)O (M= Na-2, K-2, Ca, Sr, Cu) xerogels, J ELEC SPEC, 107(3), 2000, pp. 253-259
Citations number
21
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
X-ray photoelectron spectroscopy and thermal desorption spectrometry was us
ed to study the chemical composition of the MV10Mo2O31. nH(2)O (M=Na-2, K-2
, Ca, Sr, Cu) xerogels. The binding energy, FWHM and shape of the main XPS
peaks were analysed. The valency of the vanadium ions was studied. The conc
entration ratio of tetra- and pentavalent vanadium ions N=V+4/(V+4+V+5), wh
ich is an important parameter, deciding the electronic part of total conduc
tivity, was determined from the peak fitting of the V 2p(3/2) line. The the
rmal desorption measurements were performed at the temperatures up to 550 d
egrees C; afterwards the samples in the dehydrated state were studied again
by XPS. (C) 2000 Elsevier Science B.V. All rights reserved.