Naslov
Physical properties of lead iron phosphate glasses containing Cr2O3

Autori
Šantić, Ana ; Skoko, Željko ; Gajović, Andreja ; Reis, Signo T. ; Day, Delbert E. ; Moguš-Milanković, Andrea

Izvornik
Journal of non-crystalline solids (0022-3093) 357 (2011), 21; 3578-3584

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
phosphate glasses ; Raman spectroscopy ; thermal properties ; electrical transport

Sažetak
The influence of Cr2O3 on glass forming characteristics and physical properties of PbO–Fe2O3–P2O5 glasses has been investigated by Raman and Mössbauer spectroscopies, X-ray diffraction analysis (XRD), Differential Thermal Analysis (DTA), Scanning Electron Microscopy (SEM) and impedance spectroscopy. Glasses of the general composition xCr2O3–(28.3-x)PbO–28.7Fe2O3–43.0P2O5, 0≤×≤10, (mol%) were prepared by conventional melt-quenching technique. The compositions containing up to 4 mol% Cr2O3 formed fully amorphous samples and their Raman spectra show systematic increase in the fraction of orthophosphate Q0 units with increasing Cr2O3 content and O/P ratio. On the other hand, compositions containing 8 and 10 mol% Cr2O3 partially crystallized during cooling and annealing to Fe7(PO4)6, Fe2Pb3(PO4)4 and Cr2Pb3(PO4)4. A high tendency for crystallization of these melts is related to the high O/P (N4) and Fe2+/Fetot (≈0.60) ratios. Electrical conductivity of xCr2O3–(28.3-x)PbO–28.7Fe2O3–43.0P2O5, 0≤×≤10, (mol%) compositions is independent of Cr2O3 and controlled entirely by the polaron transfer between Fe2+ and Fe3+ ions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA