Synthesis of chemically pure b-phase powders of gallium(III) oxide

Keywords: Gallium (III) oxide, Gallium (III) nitrate, Polymorphous modifications, Stoichiometry, Crystal structure, Monoclinic crystal system, Lattice parameters

Abstract

    The purpose of our study was to develop an optimal procedure for the synthesis of the b-phase of gallium(III) oxide with a high degree of chemical purity. Based on the analysis of the possible synthesis methods of the b-phase of gallium(III) oxide, we suggested a procedure which uses gallium(III) nitrate crystallohydrate as a precursor for obtaining the final product. The article demonstrates that during the synthesis of gallium(III) nitrate by means of direct interaction between metallic gallium and concentrated nitric acid, a hygroscopic crystallohydrate is formed with the formula Ga(NO3)3· 9H2O.
      Powders of the b-phase of Ga2O3 were synthesised by means of the thermal decomposition of gallium(III) nitrate in an oxygen atmosphere. Electron probe microanalysis (EPMA) and X-ray phase analysis (XRD) were used to determine the quantitative chemical composition, stoichiometry, and crystal structure of the gallium(III) oxide samples synthesised at different temperatures. The EPMA of the powders calcinated at temperatures Tcalc = 500–950 °C demonstrated that the ratio of the elements was constant and corresponded to the stoichiometric composition of Ga2O3. A comparative analysis of the X-ray diffraction peaks demonstrated that with an increase in the decomposition temperature within the range
Tcalc = 500–950 °C, the symmetry of the structure of the Ga2O3 powders decreased from the cubic to the monoclinic. The study also determined that the samples of gallium(III) oxide synthesised at Tcalc = 950 °C are single-phase and consist entirely of the monoclinic b-phase. The XRD data was used to calculate the crystal lattice parameters of the samples of the b-phase of Ga2O3 synthesised at Tcalc = 950 °C.

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Author Biographies

Alexander M. Samoylov, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Dr. Sci. (Chem.), Professor
of the Department of Materials Science and Industry
of Nanosystems, Voronezh State University (Voronezh,
Russian Federation).

Stanislav S. Kopytin, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

postgraduate student,
Department of Materials Science and Industry of
Nanosystems, Voronezh State University (Voronezh,
Russian Federation).

Kirill V. Oreshkin, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

student, Department of Materials
Science and Industry of Nanosystems, Voronezh State
University (Voronezh, Russian Federation).

Elizaveta A. Shevchenko, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

student, Department of
Materials Science and Industry of Nanosystems,
Voronezh State University (Voronezh, Russian
Federation).

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Published
2022-08-26
How to Cite
Samoylov, A. M., Kopytin, S. S., Oreshkin, K. V., & Shevchenko, E. A. (2022). Synthesis of chemically pure b-phase powders of gallium(III) oxide. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 24(3), 345-355. https://doi.org/10.17308/kcmf.2022.24/9857
Section
Original articles