Autor(es)

Costa, Beatriz Helena ; Tayama, Gabriel Toshiaki ; Santagneli, Silvia Helena

• Tipo de documento: Artigo Científico
• Fonte: Journal of Non-Crystalline Solids; v. 639, p. 12-pg., 2024-06-27.

Resumo

Aluminophosphosilicate materials of composition (mol.%) xSiO 2 [(Al 2 O 3 ) 50 - (P 2 O 5 ) 50 ] 100-x were prepared through sol -gel method and heat-treated yielding non-crystalline materials. The structural evolution from the hybrid to heat-treated material as a function of the SiO 2 content was studied by 13 C, 29 Si, 31 P and 27 Al solid-state NMR, infrared spectroscopies, X-ray diffraction and differential scanning calorimetry (DSC). NMR analyses showed the AlPO 4 formation in the matrix and heterocondensation, forming Al -O -P and P -O -Si linkages. The heat treatment promoted the formation of a more interconnected SiO 2 tetrahedra network as the SiO 2 content increased. Similar to the hybrid materials, the increase of SiO 2 content induces the replacement of P-O-Al(IV) bonds by Si-O-Al(IV) bonds in the heat-treated materials as confirmed by 27 Al NMR and 27 Al{ 31 P} REDOR data, which was also supported by Raman analysis. This sol -gel route provides a novel way to fabricate new homogeneous materials, which can be doped with rare earths and applied to new optical devices. (AU)

• Processo FAPESP: 18/24735-3 - Correlação entre a estrutura e as propriedades investigada por RMN multinuclear no estado sólido em materiais desordenados
• Beneficiário: Silvia Helena Santagneli
• Modalidade de apoio: Auxílio à Pesquisa - Regular