| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312825 |
| ISSN: | 1516-1439 |
| Autores: | Gouveia, Deiby Santos1 Rosenhaim, Raul2 Souza, Antonio Gouveia de Santos, Ieda Maria Garcia dos Lima, Severino Jackson Guedes3 Longo, Elson4 |
| Instituciones: | 1Comissao Nacional de Energia Nuclear, Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo. Brasil 2Universidade Federal da Paraiba, Departamento de Quimica, Joao Pessoa, Paraiba. Brasil 3Universidade Federal da Paraiba, Departamento de Tecnologia Mecanica, Joao Pessoa, Paraiba. Brasil 4Universidade Federal de Sao Carlos, Departamento de Quimica, Sao Carlos, Sao Paulo. Brasil |
| Año: | 2005 |
| Periodo: | Abr-Jun |
| Volumen: | 8 |
| Número: | 2 |
| Paginación: | 213-219 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | Oxides with spinel structures have been studied for many decades as they have been used in a variety of applications like pigments and refractories. They have also been used as a model structure to evaluate the relative stability of ions in octahedral and tetrahedral sites. Zinc- antimony spinels (Zn7Sb2O12) were synthesized by the Pechini method and the cation Zn2+ was substituted by Co2+, taking into consideration the stoichiometry of Co xZn7-xSb2O12 (x = 0 - 7). Characterization of the thermal properties of pyrolyzed powders was carried out with a TG/DTA analyzer, and mass losses were determined as a function of the cobalt content in the resin. The powders were calcined at temperatures in the range 600 to 1000 °C and characterized by XRD, BET and IR spectroscopy. Maximum cristalinity was obtained in powders calcined at 1000 °C. Materials with x = 5 - 7 revealed the presence of a secondary phase (Co, Zn)Sb2O6. Infrared analysis facilitated in the determination of the possible sites of Zn2+, Co2+ and Sb2+ ions in the lattice |
| Disciplinas: | Ingeniería, Química |
| Palabras clave: | Ingeniería de materiales, Ingeniería mecánica, Química industrial, Espinelas, Cobalto, Zinc, Síntesis química, Tratamiento térmico |
| Keyword: | Engineering, Chemistry, Materials engineering, Mechanical engineering, Industrial chemistry, Spinels, Cobalt, Zinc, Chemical synthesis, Thermal treatment |
| Texto completo: | Texto completo (Ver HTML) |
