Phase formation in the Ag2MoO4–Rb2MoO4–Hf(MoO4)2 system

Yunna L. Tushinova; Bair G. Bazarov; Evgeniy V. Kovtunets; Jibzema G. Bazarova

doi:10.17308/kcmf.2021.23/3679

Yunna L. Tushinova Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation; Banzarov Buryat State University, 24a ul. Smolina, Ulan-Ude 670000, Republic of Buryatia, Russian Federation https://orcid.org/0000-0003-1032-8854
Bair G. Bazarov Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation; Banzarov Buryat State University, 24a ul. Smolina, Ulan-Ude 670000, Republic of Buryatia, Russian Federation https://orcid.org/0000-0003-1712-6964
Evgeniy V. Kovtunets Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation https://orcid.org/0000-0003-1301-1983
Jibzema G. Bazarova Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation https://orcid.org/0000-0002-1231-0116

DOI: https://doi.org/10.17308/kcmf.2021.23/3679

Keywords: Phase diagram, Triangulation, Solid-state synthesis, Ternary molybdate, Silver molybdate, Rubidium molybdate, Hafnium molybdate, X-ray diffraction analysis

Abstract

Systematic studies of the subsolidus structure of ternary molybdate systems allow expanding the representation of ternary molybdates. In this paper we studied the solid phase interaction in the Ag₂MoO₄–Rb₂MoO₄–Hf(MoO₄)₂ system for the first time using X-ray phase analysis.
To determine the quasi-binary sections, we use the method of “intersecting cuts”. It helped to reveal the formation of new Rb₅Ag_1/3Hf_5/3(MoO₄)₆ and Rb₃AgHf₂(MoO₄)₆ phases. We also determined their thermal characteristics using differential scanning calorimetry. The ternary molybdate Rb₅Ag_1/3Hf_5/3(MoO₄)₆ crystallised in the trigonal syngony with the following
unit cell parameters: a = 10.7117(1), c = 38.5464(5) Å (space group R3с, Z = 6). The Ag₂MoO₄–Rb₂MoO₄–Hf(MoO₄)₂ system is characterised by the existence of ten quasi-binary cross sections.
The experimental data obtained in this work complement the information on phase equilibria in condensed ternary systems containing molybdates of tetravalent elements and two different monovalent elements. This provides opportunities for the combination of the compositions of ternary molybdates due to cationic substitutions, which will allow controlling their properties.

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Author Biographies

Yunna L. Tushinova, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation; Banzarov Buryat State University, 24a ul. Smolina, Ulan-Ude 670000, Republic of Buryatia, Russian Federation

PhD in Chemistry, Researcher
Fellow, 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: tushinova@binm.ru

Bair G. Bazarov, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation; Banzarov Buryat State University, 24a ul. Smolina, Ulan-Ude 670000, Republic of Buryatia, Russian Federation

DSc in Physics and Mathematics,
Leading Researcher, Laboratory of Oxide Systems
Baikal Institute of Nature Management, Siberian
Branch of the Russian Academy of Sciences (BINM SB
RAS), Associate Professor at the Department of
Inorganic and Organic chemistry, Banzarov Buryat
State University, Ulan-Ude, Russian Federation;
e-mail: bazbg@rambler.ru

Evgeniy V. Kovtunets, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation

Postgraduate Student, Junior
Researcher, Laboratory of Oxide Systems, Baikal
Institute of Nature Management, Siberian Branch of
the Russian Academy of Sciences, Ulan-Ude, Russian
Federation; e-mail: kovtunets@binm.ru

Jibzema G. Bazarova, Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, 6 ul. Sakhyanovoy, Ulan-Ude 670047, Republic of Buryatia, Russian Federation

DSc in Chemistry, Chief
Scientist Laboratory of Oxide Systems, Baikal Institute
of Nature Management, Siberian Branch of the Russian
Academy of Sciences, Ulan-Ude, Russian Federation;
e-mail jbaz@binm.ru

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Phase formation in the Ag2MoO4–Rb2MoO4–Hf(MoO4)2 system

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