Influence of synthesis and processing parameters of the columbite precursor on the amount of Perovskite PMN



Título del documento: Influence of synthesis and processing parameters of the columbite precursor on the amount of Perovskite PMN
Revista: Materials research
Base de datos: PERIÓDICA
Número de sistema: 000312405
ISSN: 1516-1439
Autores: 1


2
Instituciones: 1Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Quimica, Araraquara, Sao Paulo. Brasil
2Universidade Federal de Sao Carlos, Departamento de Quimica, Sao Carlos, Sao Paulo. Brasil
Año:
Periodo: Oct
Volumen: 2
Número: 4
Paginación: 255-260
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Descriptivo
Resumen en inglés Columbite route for synthesis of P3MgNb2O9 (PMN) allows the suppression of secondary phases in PMN powders. These phases, having low dielectric constant, affect negatively the dielectric properties of PMN ceramics. Aiming to get reactive PMN powders, the partial oxalate method was used to precipitate lead oxalate over MgNb2O6 particles. The columbite (NM) powders were prepared using polymeric precursor based on Pechini's method. Two processing routes were used to prepare PMN powders. In the first one the NM-lead oxalate co-precipitate was washed in water and ethanol and calcined at several temperatures. In the second route, the NM-lead oxalate co-precipitate was washed in water and isopropyl alcohol, ball milled for 30 min and calcined at several temperatures. The second route leads to practically pyrochlore free PMN. Powders morphologies observed by SEM showed the formation of agglomerates, which sizes depend on the processing route
Disciplinas: Ingeniería,
Química
Palabras clave: Ingeniería química,
Química orgánica,
Perovskita,
Aglomerados
Keyword: Engineering,
Chemistry,
Chemical engineering,
Organic chemistry,
Perovskite,
Agglomerates
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