Dielectric behaviour of chromium iron phosphate glasses (CROSBI ID 508643)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Šantić, Ana ; Moguš-Milanković, Andrea ; Day, Delbert E.
engleski
Dielectric behaviour of chromium iron phosphate glasses
The relationship between structure and electrical/dielectric properties for glass system xCr2O3-(100-x)[40Fe2O3-60P2O5], (0 x 15, in mol%) has been investigated by Raman and impedance spectroscopy. Experimental impedance spectra were interpreted by means of equivalent circuit modelling, using complex non-linear least square (CNLLSQ) procedure. The Raman spectra of glasses with up to 10 mol% of Cr2O3 show predominantly pyrophosphate structure. With increasing Cr2O3 content  10 mol% high tendency for crystallization was observed which was confirmed with XRD. The electrical properties of chromium iron phosphate glasses show strong dependence on concentration of Fe(II) ions. Although the Fe2O3 content decreases slightly from 40 to 34 mol%, the electrical conductivity increases from 4.9x10-9 to 7.7x10-8 ( m)-1 at 303 K due to increase in Fe(II) fraction from 15 to 51% in these glasses. An increase in Fe(II) concentration with increasing Cr2O3 content indicates a possible redox process between iron and chromium ions during glass melting. The evolution of the complex dielectric permittivity as a function of frequency and temperature was investigated. The thermal activated relaxation mechanism dominates the observed relaxation behavior. The relationship between relaxation parameters and electrical conductivity indicates that the electronic conductivity is controlled by polaron hopping between iron ions.
chromium iron phosphate glasses; deilectric properties
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Podaci o prilogu
162-x.
2005.
objavljeno
Podaci o matičnoj publikaciji
Book of Abstracts of the 5th International Discussion Meeting on Relaxations in Complex Systems
Descamps, Marc ; Affouard, Frederic ; Ngai Kia L.
Lille: Universite des Sciences et Technologies de Lille
Podaci o skupu
5th International Discussion Meeting on Relaxations in Complex Systems
poster
07.07.2005-13.07.2005
Lille, Francuska