Characterization of the Aluminas Formed During the Thermal Decomposition of Boehmite by the Rietveld Refinement Method
Boehmite synthesized through a sol-gel route from a nonconventional raw material, as an aluminum waste, was calcined at temperatures between 500 and 1500°C. Quantification of crystalline phases was performed by the Rietveld refinement of the XRD patterns. ¿-Al2O3 is formed at 500°C, and up to 1000°C...
| Autores: | , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versión aceptada para publicación |
| Data de publicação: | 2014 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositório: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::378679a8b1562dd5cb9390d4fbcbb7b8 |
| Acesso em linha: | http://hdl.handle.net/10261/103034 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Thermal decomposition Boehmite Crystalline phases Characterization aluminas |
| Resumo: | Boehmite synthesized through a sol-gel route from a nonconventional raw material, as an aluminum waste, was calcined at temperatures between 500 and 1500°C. Quantification of crystalline phases was performed by the Rietveld refinement of the XRD patterns. ¿-Al2O3 is formed at 500°C, and up to 1000°C, is the dominant phase. At temperatures ranging from 1000 to 1400°C, it was observed the appearance of a four-phase region. The complete transformation into ¿-Al2O3 lasts until 12 h at 1400°C or at higher temperatures. The presence of an amorphous phase in calcined samples was confined by direct comparison with a standard of pure ¿-Al2O3. |
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