Investigation of (100−x)[0·5PbO.0·2B2O3.0·3P2O5].xMoO3 glasses

Insertion of MoO3in Borophosphate Glasses Investigated by Magnetic Resonance Spectroscopies

“…No clear model has been proposed so far on the exact effect of molybdenum ions on the mixed borophosphate network. Vibrational and 1D NMR spectroscopies have recently been employed but do not afford clear results because of the complex Raman and NMR spectra assignment. , In this paper, new insights are provided by a magnetic resonance investigation performed on the x MoO 3 -(100- x )­(50PbO-10B 2 O 3 -40P 2 O 5 ) composition line. Solid state 31 P, 11 B, and 95 Mo nuclear magnetic resonance (NMR) experiments have been used for the first time to analyze the local orders of the phosphate, borate, and molybdate units.…”

“…The proportion of reduced species Mo 5+ (defined as the glass redox = Mo 5+ /Mo total in our case) is controlled by the melting temperature/time/atmosphere or the melt optical basicity. While MoO 3 -phosphate systems are known for their poor chemical durability, it has been shown that B 2 O 3 insertion overcomes this limitation, leading to top quality and durable glass systems. − Numerous studies have been devoted to the characterization of the macroscopic properties of MoO 3 borophosphate glasses, but only sparse information is available on the glass network organization. No clear model has been proposed so far on the exact effect of molybdenum ions on the mixed borophosphate network.…”