Abstract
The influence of Cr 2O 3 on glass forming characteristics and physical properties of PbO–Fe 2O 3–P 2O 5 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 xCr 2O 3–(28.3-x)PbO–28.7Fe 2O 3–43.0P 2O 5, 0 ≤ × ≤ 10, (mol%) were prepared by conventional melt-quenching technique. The compositions containing up to 4 mol% Cr 2O 3 formed fully amorphous samples and their Raman spectra show systematic increase in the fraction of orthophosphate Q 0 units with increasing Cr 2O 3 content and O/P ratio. On the other hand, compositions containing 8 and 10 mol% Cr 2O 3 partially crystallized during cooling and annealing to Fe 7(PO 4) 6, Fe 2Pb 3(PO 4) 4 and Cr 2Pb 3(PO 4) 4. A high tendency for crystallization of these melts is related to the high O/P (> 4) and Fe 2+/Fe tot (≈ 0.60) ratios. Electrical conductivity of xCr 2O 3–(28.3-x)PbO–28.7Fe 2O 3–43.0P 2O 5, 0 ≤ × ≤ 10, (mol%) compositions is independent of Cr 2O 3 and controlled entirely by the polaron transfer between Fe 2+ and Fe 3+ ions.
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