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Investigation of a New Class of Disordered Inorganic Materials

“…P=0 is known to be a constituent in phosphate glasses that disrupt the crystalline network. This band appears very similar to those in the spectra of binary phosphosilicate glasses, some samples of which are annealed at 800 to 1000 °C [49][50]. Also, various cation-stabilized phosphosilicate glasses are known to have metaphosphate chain structures.…”

“…Both Cerablak samples showed a strong, sharp peak near 1350 cm" 1 , while no such peak appeared in the berlinite spectrum. This peak is in the range 1280-1390 cm ' 1 that has been assigned to P=0 in a variety of phosphate glasses [49][50]. P=0, as a terminal group, does not appear in crystalline aluminum phosphates.…”

Solid state NMR study of phosphosilicate gels

“…Two composition of phosphosilicate gels, 10P 2 O 5 AE 90SiO 2 (10P) and 30P 2 O 5 AE 70SiO 2 (30P), were prepared using a procedure that has been reported in a previous paper [5]. 29 Si, 31 P, 1 H MAS-NMR measurements were performed on phosphosilicate gels heated to 100°C (dried gel) for one day, up to 300°C and then quenched, up to 400°C and held for 30 min.…”

More insight in the structure of silicophosphate gels by 31P–29Si CP MAS multidimensional experiments and 1H–31P–29Si triple resonance experiments

“…Indeed, these materials present interesting technological and structural properties suitable for fast proton conductor [1][2][3] and for applications in biomaterials and catalysts [4].…”

“…More recently, D'Apuzzo et al [3] have reported the synthesis by sol-gel process of phosphosilicate gels having the molar composition 10 P 2 O 5 ·90 SiO 2 (10P) and 30 P 2 O 5 ·70 SiO 2 (30P) using POCl 3 as phosphorous precursor and TEOS (Si(OCH 2 CH 3 ) 4 ) as silica source. They have studied their structures by a detailed solid-state 29 Si, 31 P and 1 H SPE MAS NMR experiments for different heat treatments.…”