| Título: | Caracterización de la solución sólida Na2(C03,S04) A 550°C |
| Autores: | López Andrés, Sol ; Marcos Pascual, Celia ; Cocaño Blanco, Susana ; García Martínez, O. ; Prieto Rubio, Manuel |
| Tipo de documento: | texto impreso |
| Editorial: | Univ. Oviedo, Vicerrectorado de Extensión Universitaria, 1996 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Cristalografía , Tipo = Sección de libro |
| Resumen: |
Although it is known that unlimited solid solution exists for the high temperature polymorphs Na2S04 (1)and ?-Na2C03 , the phase relationships and the variation of crystallographic parameters for different compositions are not studied. Na2S04 has four well established modifications, but only the high temperature modification Na2S04 (1) (P?3/mmc), stable above 237°C, forms extended solid solution series with Na2C03. At the other extreme, Na2C03 shows three polymorphs and a rather complicated transition behaviour, being the hexagonal phase ?-Na2C03 (P?3/mmc)stable at T > 489°C. In this paper, the crystallographic parameters were determined at 550°C for different solid solution compositions. The study was carried out by X ray diffraction in a high temperature powder camera. The diffraction patterns show a continuous evolution through the entire compositional range. Crystalline spacings and cell parameters decrease as the sulphate content decreases. This fact and the unusual unlimited S04=-C03= substitution can be explained by the orientational disorder of tetrahedral and triangular groups. Theoretical powder diffraction diagrams, calculated assuming this orientational and substitutional disorder, show a good fit with the experimentalresults. |
| En línea: | https://eprints.ucm.es/id/eprint/15307/1/1996_Caracterizacion_Solucion_Solida_Na2%28CO3SO4%29_550%C2%BAC_%28Cristalografia_Macromoleculas_Treansformaciones_Fase_Materiales_Crecimiento_Cristalino%29.pdf |
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