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Dielectric and spectroscopic properties of PbO–Nb 2 O 5 –P 2 O 5 :V 2 O 5 glass system
Author(s) -
Krishna Mohan N.,
Sahaya Baskaran G.,
Veeraiah N.
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622093
Subject(s) - analytical chemistry (journal) , dielectric , raman spectroscopy , vanadium , natural bond orbital , ion , materials science , dielectric loss , differential thermal analysis , absorption spectroscopy , absorption (acoustics) , conductivity , infrared spectroscopy , electrical resistivity and conductivity , mineralogy , chemistry , inorganic chemistry , optics , molecule , physics , optoelectronics , organic chemistry , chromatography , diffraction , composite material , quantum mechanics
PbO–Nb 2 O 5 –P 2 O 5 glasses containing different concentrations of V 2 O 5 ranging from 0 to 1.0 mol% were prepared. A number of studies, viz. differential thermal analysis, infrared, optical absorption, Raman and ESR spectra and dielectric properties (dielectric constant ϵ ′, loss tan δ , a.c. conductivity σ ac over a range of frequency and temperature), of these glasses have been carried out. The results have been analysed in the light of different oxidation states of vanadium ions. The analysis indicates that when the concentration of V 2 O 5 is increased gradually, vanadium ions are observed to exist mostly in the V 4+ state, occupy network‐modifying positions and decrease the rigidity of the glass network. A transformation of NbO 4 to NbO 6 structural units and a decrease in the concentration of PO 4 structural units have also been observed with an increase in the concentration of V 2 O 5 in the glass network. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)