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RARE METALS, SEMICONDUCTORS
ArticleName Synthesis of complex barium strontium niobates in BaNb2O6 – SrNb2O6
DOI 10.17580/tsm.2019.02.08
ArticleAuthor Veselov A. M., Spiridonov F. M., Zimina G. V., Fomichev V. V.
ArticleAuthorData

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

Abstract

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.

keywords Niobates, strontium, barium, phase relations, system, solid solutions, X-ray phase analysis
References

1. Smolensky G. A. Physics of ferroelectric phenomena: textbook. Leningrad : Nauka, 1985. 396 p.
2. Korovin S. S., Zimina G. V., Reznik A. M., Bukin V. I. Rare and dispersed elements. Chemistry and technology. Moscow : MISiS, 1996. Vol. 1. 376 p.
3. Ulex M., Pankrath R., Betzler K. Growth of strontium barium niobate: the liquidus–solidus phase diagram. Journal of crystal growth. 2004. Vol. 271, No. 1-2. pp. 128–133.
4. Dong-Wan Kim, Hee Bum Hong, Kug Sun Hong, Chang Kyung Kim, Deug Joong Kim. The reversible phase transition and dielectric properties of BaNb2O6 polymorphs. Japanese journal of applied physics. 2002. Vol. 41, No. 10. pp. 6045–6048.
5. Bonner W. A., Carruthers J. R., O'Bryan H. M. Jr. Effects of changes in melt composition on crystal growth of barium sodium niobate. Materials research bulletin. 1970. Vol. 5, No. 4. pp. 243–252.
6. Simonov V. I. An atomic structure and physical properties of crystals. Kristallografiya. 2003. Vol. 48, No. 6. pp. 91–102.
7. Leitner J., Hampl M., Ruzicka K., Straka M., Sedmidubský D., Svoboda P. Thermodynamic properties of strontium metaniobate SrNb2O6. Journal of thermal analysis and calometry. 2008. Vol. 91, No. 3. pp. 985–998.
8. Zibrov I. P., Filonenko V. P., Werner P.-E., Marinder B.-O., Sundberg M. A new high-pressure modification of Nb2O5. Journal of solid state chemistry. 1998. Vol. 141, Iss. 1. pp. 205–211.
9. Smirnova K. A., Fomichev V. V., Drobot D. V., Nikishina E. E. Obtaining nanosized niobium and tantalum pentoxides by using supercritical antisolvent fluid technology. Fine chemical technologies. 2015. Vol. 10, No. 1. pp. 76–82.
10. Tarasova N., Colomban Ph., Animitsa I. The short-range structure and hydration process of fluorine-substituted double perovskites based on bariumcalcium niobate Ba2CaNbO5.5. Journal of physics and chemistry of solids. 2018. Vol. 118. pp. 32–39.
11. Maalti Puri, Sukhteen Bindra Narang, Shalini Bahel. Influence of frequency and temperature on dielectric and electrical properties of Ca-substituted barium iron niobate. Ceramics international. 2018. Vol. 44. pp. 9112–9124.
12. Chernaya T. S., Maksimov B. A., Volk T. R., Ivleva L. I., Simonov V. P. An atomic structure of Sr0.75Ba0.25Nb2O6 monocrystal and relations between a composition, a structure and properties in (Sr,Ba)Nb2O6 solid solutions. Fizika tverdogo tela. 2000. Vol. 42, No. 9. pp. 1668–1672.
13. Desplanches G., Barraud Y., Lazennec Y. A new crystalline form in the BaNb2O6 – SrNb2O6 pseudo-binary system. Journal of crystal growth. 1974. Vol. 23. pp. 149–150.
14. Yun Rao, Hanxing Liu, Hua Hao, Zhonghua Yao et al. MgO-modified Sr0.7Ba0.3Nb2O6 ceramics for energy storage applications. Ceramic international. 2018. Vol. 44, No. 10. pp. 11022–11029.
15. Boniort Y. Y., Brehm C., Desplanches G., Barraud J.-Y., Margotin P. Crystal growth of strontium barium niobate BaxSr1 – xNb2O6. Journal of crystal growth. 1975. Vol. 30, No. 3. pp. 357–362.
16. Ottini R., Tealdi C., Tomasi C. et al. Local environments and transport properties of heavily doped strontium barium niobates Sr0.5Ba0.5Nb2O6. Journal of solid state chemistry. 2018. Vol. 258. pp. 99–107.

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