25 October 2000 Properties and structure of lanthanum phosphate glasses
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Glasses were prepared from the system xLa2O3(DOT)(1-x)P2O5, where 0.00 <EQ x <EQ 0.30 (mole fraction), and densities, refractive indices and glass transition temperatures were determined. Inflections in the property/composition trends were observed at x approximately 0.15 La2O3. Raman spectra indicate that the phosphate network evolves from a cross- linked ultraphosphate to chain-like metaphosphate with increasing x. The property and spectral trends are interpreted with respect to the La-coordination environment, which appears to change from isolated La-polyhedra to a La-O-La subnetwork when x >= 0.15.
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Richard K. Brow, Ezz Metwalli, David L. Sidebottom, "Properties and structure of lanthanum phosphate glasses", Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000); doi: 10.1117/12.405272; https://doi.org/10.1117/12.405272

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