New double borate Rb3HoB6O12: synthesis and characterization

  • Alexey K. Subanakov Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6
  • Evgeniy V. Kovtunets Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6
  • Sampil Zh. Choydonov Banzarov Buryat State University (BSU), 670000, Republic of Buryatia, Ulan-Ude, Smolina street, 24а
  • Sesegma G. Dorzhieva Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6
  • Bair G. Bazarov Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6
Keywords: double borates rubidium and rare–earth elements,, solid-state synthesis,, citrate solgel synthesis

Abstract

Objective. At the present time the interest of researchers has arisen to complex borates as selffrequency doubling crystals, which combine laser and non-linear optical properties due to the presence of rare-earth elements and the borate matrix. Recently, we reported on the properties of the new noncentrosymmetric borates: Rb3NdB6O12 and Rb3EuB6O12. The main purpose of this paper is to synthesize and to characterize new double borate Rb3HoB6O12 .

Methods and methodology. In our study we use synthesis methods of solid state reaction and citrate sol-gel synthesis. Our analysis is based on X-ray powder diffraction method, differential scanning calorimetry and scanning electron microscopy.

Results. Polycrystalline Rb3HoB6O12  was prepared by sol-gel synthesis The purity of the double borate was confi rmed by X-ray powder diffraction analysis. While specimens obtained by solid–state reactions show Rb3HoB6O12 and small amount of impurity HoBO3. Indexing of the diffraction pattern of single-phase Rb3HoB6O12  by the isostructural compounds RbREB6O12 (RE = Nd, Eu) showed satisfactory results. Rb3HoB6O12 crystallized in space group R32 with unit cell parameters a = 13.4038(7), с = 30.315(2) Å, V = 4716.76 Å3. From differential scanning calorimetry measurements, the incongruent melting temperature Rb3HoB6O12 is observed at 818 °С. From scanning electron microscopy observations, single particles with sizes up to 100 μm formed by solid phase synthesis. The sol-gel synthesis resulted in the agglomerates 50–100 μm in size formed by strongly coalescent individual grains with a diameter below 2–3 μm.

Conclusions. New double borate Rb3HoB6O12 were prepared by sol-gel synthesis. Obtained Rb3HoB6О12 is single-phase with average particle size of 50–100 μm. The unit cell volumes and the parameters Rb3REB6О12 (RE = Nd, Eu, Ho) correlate.

 

 

 

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Author Biographies

Alexey K. Subanakov, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6

Subanakov Alexey K. – Cand. Sci. (Chem.), Senior Researcher, Laboratory of Oxide Systems, Baikal Institute
of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), Ulan-Ude, Russian Federation; e-mail: subanakov@mail.ru. ORCID iD 0000-0002-1674-283X

Evgeniy V. Kovtunets, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6

Kovtunets Evgeniy V. –graduate student, Laboratory of Oxide Systems, Baikal Institute of Nature
Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), Ulan-Ude, Russian
Federation; ORCID iD 0000-0003-1301-1983.

Sampil Zh. Choydonov, Banzarov Buryat State University (BSU), 670000, Republic of Buryatia, Ulan-Ude, Smolina street, 24а

Choydonov Sampil Zh. – student, Chemical Department, Banzarov Buryat State University (BSU),
Ulan-Ude, Russian Federation

Sesegma G. Dorzhieva, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6

Dorzhieva Sesegma G. – Cand. Sci. (Chem.), Researcher, Laboratory of Oxide Systems, Baikal Institute
of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), Ulan-Ude, Russian Federation

Bair G. Bazarov, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 670047 REP. Buryatia, Ulan-Ude, Sakhyanova street 6

Bazarov Bair G. – Dr. Sci. (Phys.-Math.), Leading Researcher, Laboratory of Oxide Systems, Baikal Institute
of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), Ulan-Ude, Russian Federation; ORCID iD 0000-0003-1712-6964

Published
2019-06-14
How to Cite
Subanakov, A. K., Kovtunets, E. V., Choydonov, S. Z., Dorzhieva, S. G., & Bazarov, B. G. (2019). New double borate Rb3HoB6O12: synthesis and characterization. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 21(2), 278-286. https://doi.org/10.17308/kcmf.2019.21/765
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