Naslov
Electronic Relaxation in Chromium Iron Phosphate Glasses

Autori
Šantić, Ana ; Moguš-Milanković, Andrea ; Kim, Cheol Woon ; Day, Delbert E.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of the XI International Conference on the Physics of Non-Crystalline Solids / Georges Kordas - Rodos : Balkan Society of Glass, 2006

Skup
The XI International Conference on the Physics of Non-Crystalline Solids

Mjesto i datum
Rodos, Grčka, 29.10.2006. - 02.11.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
iron phosphate glasses; electrical conductivity; impedance spectroscopy

Sažetak
Chromium iron phosphate glasses are electronically conducting glasses with polaronic conduction mechanism. Electronic conductivity behaviour is due to the iron ions being in two valence states where conduction takes place by electrons hopping from Fe(II) to Fe(III). The electrical conductivity of xCr2O3-(100-x)[40Fe2O3-60P2O5], (0≤ x≤ 5, in mol%) glasses has been measured by impedance spectroscopy in the frequency range from 0, 01 Hz to 1 MHz and temperature range from 303 K to 473 K. The Fe(II)/Fetot ratio was measured by Mössbauer spectroscopy. The dc conductivity, σ dc, of chromium iron phosphate glasses show strong dependence on concentration of Fe(II) ions. Although the Fe2O3 content decreases slightly from 40 to 35 mol%, the electrical conductivity increases from 4.5x10-9 to 2.4x10-8 (Ω m)-1 at 303 K due to increase in Fe(II) fraction from 15% to 28% in these glasses. The ac conductivity, σ ac, exhibits power-law frequency dependence. By applying Summerfield scaling on frequency dependent conductivity we have obtained one single master curve. The analysis indicates that the dc and ac conductivity processes are due to same polaron hopping mechanism between iron ions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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