ELECTRON-SPIN RESONANCE STUDY IN P2O5-MOO3 AND P2O5-MOO3-CAO GLASSES

ESR spectra of the glass systems P2O5-MoO3 and P2O5-MoO3-CaO are presented. The electron spin resonance results showed a strongly exchange-narrowed interaction with the [Mo5+]/[Mo6+] ratio and line shapes independent of temperature over the range 77 to 300 K. This result supports the concept of temperature-dependent mobility of the carriers and an unchanged paramagnetic site over this temperature range. The more important difference between the spectra of the binary and ternary glasses is that in the former with an increase in MoO3 content the concentration of Mo5+ ions decreases but in ternary glasses it is reversed, i.e. the ion concentration of Mo5+ increases with increase in MoO3 content. © 1979 Chapman and Hall Ltd.