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Degree of phase transformations in the conditions of polythermal synthesis of Sr2–xBaxFeMoO6–δ

Nikolay Kalanda; Marta Yarmolich; Maksim Kutuzau; Alexander Gurskii; Maria do RosárioTeixeira Soares; Mindaugas Andrulevičius; Brigita Abakevičienė; Sigitas Tamulevičius

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 + MoO3was 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 hours and T = 1443 K in vacuum of 10-5Torr 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.

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