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- W1971444186 abstract "A new protocol for synthesis of glassy aluminates with substantial content of the refractory compound LaPO4 has been developed, utilizing hydrated monazite and anhydrous metal oxides as starting materials. Ultra high-temperature NMR of samples containing up to 75 mol% LaPO4 shows that monazite is incorporated homogeneously into melts, while analysis by electron microprobe, X-ray diffraction, solid-state NMR and Raman scattering shows that water quench of samples with 50% La–monazite or less results primarily in glass formation. Network structures of the LaPO4-containing glasses remain aluminate-based, as indicated by our samples’ melting points (>1200 °C), well above those of phosphate glasses. Melting temperatures exhibit a minimum in the range 20–30% LaPO4 content. Raman spectra show only isolated phosphate groups, with no POP bonds (orthophosphates). Dissolution observations, electron microprobe composition measurements and a substantially shifted principal 31P NMR line show that La3+ lies within the second coordination shell around P in all of the glasses. P–Al TRAPDOR NMR studies and a second, more negatively shifted line in the 31P spectra indicate that P is also closely coordinated to one or two Al ions." @default.
- W1971444186 created "2016-06-24" @default.
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- W1971444186 date "2008-08-01" @default.
- W1971444186 modified "2023-09-27" @default.
- W1971444186 title "Lanthanum phosphate calcium aluminate glasses: 27Al and 31P NMR spectroscopy" @default.
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- W1971444186 doi "https://doi.org/10.1016/j.jeurceramsoc.2008.03.023" @default.
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