SOLID STATE NMR SPECTROSCOPY OF LANTHANUM PHOSPHATE GLASSES

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Lanthanum phosphate glasses are of interest in optical and nuclear waste disposal technologies. Lanthanum phosphate glasses were synthesized by melt quenching and characterized by electron microprobe analysis (EMA) and solid state NMR spectroscopy. A range of compositions was examined near the metaphosphate composition (75 mol% P₂O₅). Comparison of ³¹ P chemical shifts and shielding anisotropies of glasses with those of the crystalline phases of La(PO₃)₃ and LaP₅O₁₄ are consistent with the presence of primarily chain-like Q² phosphate groups. No significant variation in the chemical shifts were found in the glasses studied.