Rietveld refinement of amorphous SiO2 prepared via sol–gel method
By J. Martínez, S. Palomares-Sánchez, G. Ortega-Zarzosa, F. Ruiz, Y. Chumakov. 2006
182 citations recorded by the source corpus.
Abstract Using the Rietveld refinement, we analyze the structural evolution under thermal treatment of silica xerogel samples prepared by the sol–gel method with molar ratio ( R ) of water to TEOS of R = 5 and R = 11.66. We refine the structure of compounds using the Maud program and we found the unit cell parameters and atomic positions of the refined silica amorphous atoms for whole samples. The results show us that the amorphous structure is quartz-like or low-cristobalite-like, depending on the molar ratio values and the heat-treatment of the samples. For R = 5 different quartz structures are obtained, whereas for R = 11.66 we obtain close structures in which a transformation of quartz-like amorphous to low-cristobalite amorphous phase occurs at about 600 °C. These results give some scopes to explain the partial crystallization of the silica at relatively low temperatures obtained when metallic species are present.
Subfields: Ceramics and Composites, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/1d66aec9fa5c4683c740498053fac9959b55646a
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In Ceramics and Composites
In Materials Chemistry
Citations in the corpus
- Precipitation of amorphous SiO2 particles and their properties (2011, methodology): “Martinez et al. (2006) prepared amorphous SiO2 by the sol-gel procedure, subjected it to thermal treatment, then analyzed it using the Rietveld refinement.”