X-RAY PHOTOELECTRON-SPECTROSCOPY, FOURIER-TRANSFORM INFRARED-SPECTROSCOPY AND ELECTRICAL-CONDUCTIVITY STUDIES OF COPPER PHOSPHATE-GLASSES

Phosphate glasses containing CuO with composition (CuO)(x)(P2O5)(1-x), where x = 0.1, 0.2, 0.3, 0.4 and 0.5, were studied by X-ray photoelec tron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-I R) and room temperature electrical conductivity, sigma. The spin orbit components Cu 2p(3/2) and Cu 2p(1/2) show doublet structures which ma y be associated with Cu+ and Cu2+. The ratio C = Cu+/Cu-total as a fun ction of x was determined using the Cu 2p(3/2) spectra. It is observed that the ratio, C, initially decreases with x, becomes minimum at x = 0.3 and then increases. Although the variation of sigma with C was ve ry small, it is close to the uncertainty in the measurement of its val ue; nevertheless it was maximum at C = 0.5, in agreement with the prev ious prediction. The FT-IR spectra indicated a maximum shift in the P = O absorption at 30% CuO contents in the glasses, which essentially f ollows the same pattern as the shift for the P-O-P absorption. Further , the development of the high energy component peak in the O 1s (assoc iated with P-O-P oxygen) spectra follows a trend similar to the 760 cm (-1) (also associated with P-O-P) absorption band in the FT-IR spectra .