Structure Change in Strontium Oxide-Doped Dicalcium Silicates

Autor:	Suketoshi Ito, Koichiro Fukuda, Iwao Maki, Susumu Ikeda
Rok vydání:	2005
Předmět:	Rietveld refinement Inorganic chemistry Crystal structure Silicate Ion chemistry.chemical_compound Crystallography chemistry Calcium silicate Materials Chemistry Ceramics and Composites Strontium oxide Chemical composition Solid solution
Zdroj:	Journal of the American Ceramic Society. 79:2577-2581
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1996.tb09018.x
Popis:	A series of strontium-bearing dicalcium silicate (Ca2Si04 solid solutions (C2S(ss)), (SrχCa1-χ)2SiO4 with 0.02 ≤χ≤ 0.10, was prepared and examined by powder X-ray diffrac-tometry. These crystals, heated in the stable-temperature region of the α phase and then quenched in water, were composed of the β phase, with χ≤ 0.08, and the α'L and β phases, with χ= 0.10. With increasing x, the unit-cell axes of the β phase expanded and the β angle became small with eventual increase in the unit-cell volume. The Rietveld analysis of the β-C2S(ss) with χ= 0.08 showed that the Sr2+ ions preferentially occupied the seven-coordinated site rather than the eight-coordinated site. This site preference, which was originally established in the parent α-phase structure, seemed to cause the systematic change in the cell dimensions.
Databáze:	OpenAIRE
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