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Название Synthesis of complex barium strontium niobates in BaNb2O6 – SrNb2O6
DOI 10.17580/tsm.2019.02.08
Автор Veselov A. M., Spiridonov F. M., Zimina G. V., Fomichev V. V.
Информация об авторе

MIREA – Russian Technological University, Moscow, Russia:

A. M. Veselov, Master’s Student
G. V. Zimina, Lead Researcher of the Bolshakov Department of Chemistry and Technology of Rare and Dispersed Elements, Nanoscale and Composite Materials
V. V. Fomichev, Professor of the Bolshakov Department of Chemistry and Technology of Rare and Dispersed Elements, Nanoscale and Composite Materials, e-mail: valeryfom@rambler.ru

Lomonosov Moscow State University, Moscow, Russia:

F. M. Spiridonov, Associate Professor of the Inorganic Chemistry Department


Solid-phase synthesis and X-ray analysis methods were used to study a phase formation in BaNb2O6 – SrNb2O6 quasi-binary system within a temperature range of 950–1200 oC. Strontium and barium carbonates and niobium oxide were used as initial substances. It was found that the components of the system started to interact at 950 oC already. At such temperature the system contains two single-phase zones: tetragonal solid solutions based on barium niobate with strontium niobate up to 10% (mol.) and a monoclinic form based on strontium niobate with a content of over 85% (mol.), and a double-phase zone with the strontium niobate content within a range of 10–85% (mol.) — a mixture of these solid solutions. At 1100 oC the system contains three zones of tetragonal solid solutions: based on barium niobate SrxBa1 – xNb2O6 (х ≤ 0.05); based on strontium niobate (х ≥ 0.85); based on complex niobate SrxBa1 – xNb2O(0.3  0.4), showing ferro electric behavior. At 1100 oC there are zones of solid solution mixtures: at 0.05  0.3 — barium niobate-based and complex-niobate tetragonal solid solutions, and at 0.4  0.85 — a mixture of two solid solution forms based on complex niobate: high-temperature tetragonal and low-temperature monoclinic forms with a strontium niobatebased solid solution. An increase in synthesis temperature to 1200 oC results in a sudden expansion (0.2  0.75) of a zone of the tetragonal solid solution based on complex niobate SrxBa1 – xNb2O6, showing ferroelectric behavior, and elimination of a monoclinic form of such solution mixed with the strontium niobate-based solution. Thus, the research performed showed that it was feasible to decrease synthesis temperature of SrxBa1 – xNb2O6 tetragonal solid solution (ferroelectric material) from 1400 to 1200 oC.

Ключевые слова Niobates, strontium, barium, phase relations, system, solid solutions, X-ray phase analysis
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