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Rietveld refinement of amorphous SiO2 prepared via sol-gel method
related by: authorship_10306
most specific type: Article
type: Document
type: Article
type: Generically Dependent Continuant
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. © 2006 Elsevier B.V. All rights reserved.
related by: authorship_10307
related by: authorship_10309
page end: 3529
type: Thing
page start: 3526
volume: 60
origen: scopus
related by: authorship_10305
most specific type: Document
type: Entity
related by: authorship_10308
crisid: 1718
type: Continuant
issue: 29-30
estado: published
type: Information Content Entity
has publication venue: Materials Letters
freetext keyword: Rietveld refinement; Sol-gel; X-rays Crystal structure; Crystallization; Heat treatment; Quartz; Silica; Sol-gels; Amorphous atoms; Molar ratio; Rietveld refinement; Amorphous materials
doi: 10.1016/j.matlet.2006.03.044
date time value: article date 1718
e iscopus: 2-s2.0-33750421410

Materials Letters
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publication venue for: Rietveld refinement of amorphous SiO2 prepared via sol-gel method
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type: Document
type: Generically Dependent Continuant

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date: 2026-08-26T10:46:16
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