Degree of phase transformations in the conditions of polythermal synthesis of SrBaFeMoO6–δ

• Autor(a) principal: Kalanda, Nikolay
• Data de Publicação: 2020
• Outros Autores: Yarmolich, Marta, Kutuzau, Maksim, Gurskii, Alexander, Soares, Maria do Rosário Teixeira, Andrulevičius, Mindaugas, Abakevičienė, Brigita, Tamulevičius, Sigitas
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/36986
• topic: Magnetic metal oxide compound; Double perovskite; Polythermal synthesis; Differential thermal analysis; Thermogravimetric analysis

The sequence of phase transformations during the crystallization of SrBaFeMoO6–δ by the solid-phase technique from a stoichiometric mixture of simple oxides SrCO3 + BaCO3 + 0.5Fe2O3 + MoO3 was studied. It has been established that the synthesis of barium – strontium ferromolybdate proceeds through a series of sequential - parallel stages. It was found that to minimize the effect of intermediate reaction products, it is necessary to use combined synthesis modes. As a result of using combined synthesis modes for annealing for 20 h and T = 1443 K in vacuum of 10−5 Torr at the pressure of residual oxygen gas 10−8 Pa, it was possible to obtain a single-phase barium – strontium ferromolybdate compound with superstructural ordering of iron and molybdenum cations.