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As a result of studying the possibility of phase formation in triple salt systems Rb2MoO4–AMoO4–R(MoO4)2 (A – divalent elements; R = Zr, Hf) phases of the composition Rb5A0.5R1.5(MoO4)6, were obtained, which are assigned to a large family of ternary molybdates with the general formula M5A0.5R1.5(MoO4)6 (M – single valent element, A – divalent element, R = Zr, Hf) and represent a series of isostructural substances crystallizing in trigonal syngony (sp.gr. R3c или R3) [1, 2]. Crystallographic and thermal characteristics of the synthesized compounds were determined.
Methods. The subsolidus structure of the ternary salt systems Rb2MoО4–АMoO4–R(MoO4)2 was established using the “intersecting cuts” method. polycrystalline samples The powder samples compounds Rb5А0.5R1.5(MoO4)6 (A = Mg, Ca, Mn, Co, Ni, Zn, Sr, Cd, Ba, Pb; R = Zr, Hf) were obtained by solid-phase synthesis at 500–530°C.
Results. The subsolidus structure of the ternary salt systems Rb2MoO4–AMoO4–Zr(MoO4)2 (A = Mn, Pb,), Rb2MoO4–AMoO4–R(MoO4)2 (A = Zn, Cd, R = Zr, Hf) was established. The Rb5A0.5R1.5(MoO4)6 (А = Mg, Ca, Mn, Co, Ni, Zn, Sr, Cd, Ba, Pb; R = Zr, Hf) were obtained in powder form, their crystallographic and thermal characteristics were determined. IR and Raman spectra were recorded and analyzed for the compounds Rb5A0.5Zr1.5(MoO4)6 (A = Ni, Со, Mg, Zn), Rb5Ba0.5Zr1.5(MoO4)6.
Conclusions. Phase formation in ternary salt systems Rb2MoO4–AMoO4–R(MoO4)2 (A = Mg, Mn, Zn, Ni, Co, Cd, Ca, Pb, Sr, Ba; R = Zr, Hf) was studied and a subsolidus structure was established for six of them. Compounds Rb5A0.5R1.5(MoO4)6 were obtained by solid-phase synthesis at 500–530°C and belong to a large family of ternary molybdates with the general formula M5A0.5R1.5(MoO4)6 (M – single valent element, A – divalent element, R = Zr, Hf) and crystallize in two structural types: molybdates with large divalent metals (A = Ca, Sr, Ba, Pb) – in the structural type Tl5Pb0.5Hf1.5(MoO4)6 (пр.гр. R3, [2]), molybdates with divalent metals whose radius is less than 1Ǻ (A = Mg, Mn, Zn, Ni, Co, Cd) – in the structural type K5Mg0.5Zr1.5(MoO4)6 (пр.гр. R3c, [1]).
Methods. The subsolidus structure of the ternary salt systems Rb2MoО4–АMoO4–R(MoO4)2 was established using the “intersecting cuts” method. polycrystalline samples The powder samples compounds Rb5А0.5R1.5(MoO4)6 (A = Mg, Ca, Mn, Co, Ni, Zn, Sr, Cd, Ba, Pb; R = Zr, Hf) were obtained by solid-phase synthesis at 500–530°C.
Results. The subsolidus structure of the ternary salt systems Rb2MoO4–AMoO4–Zr(MoO4)2 (A = Mn, Pb,), Rb2MoO4–AMoO4–R(MoO4)2 (A = Zn, Cd, R = Zr, Hf) was established. The Rb5A0.5R1.5(MoO4)6 (А = Mg, Ca, Mn, Co, Ni, Zn, Sr, Cd, Ba, Pb; R = Zr, Hf) were obtained in powder form, their crystallographic and thermal characteristics were determined. IR and Raman spectra were recorded and analyzed for the compounds Rb5A0.5Zr1.5(MoO4)6 (A = Ni, Со, Mg, Zn), Rb5Ba0.5Zr1.5(MoO4)6.
Conclusions. Phase formation in ternary salt systems Rb2MoO4–AMoO4–R(MoO4)2 (A = Mg, Mn, Zn, Ni, Co, Cd, Ca, Pb, Sr, Ba; R = Zr, Hf) was studied and a subsolidus structure was established for six of them. Compounds Rb5A0.5R1.5(MoO4)6 were obtained by solid-phase synthesis at 500–530°C and belong to a large family of ternary molybdates with the general formula M5A0.5R1.5(MoO4)6 (M – single valent element, A – divalent element, R = Zr, Hf) and crystallize in two structural types: molybdates with large divalent metals (A = Ca, Sr, Ba, Pb) – in the structural type Tl5Pb0.5Hf1.5(MoO4)6 (пр.гр. R3, [2]), molybdates with divalent metals whose radius is less than 1Ǻ (A = Mg, Mn, Zn, Ni, Co, Cd) – in the structural type K5Mg0.5Zr1.5(MoO4)6 (пр.гр. R3c, [1]).
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2. Bazarov B.G., Sarapulova A.E., Klevtsova R.F., Glinskaya L.A., Fedorov K.N., Bazarova Z.G. Synthesis Structure and Vibration Spectra of the Triple Molybdates Tl5A0.5Hf1.5(MoO4)6, A = Ca, Sr, Ba, Pb. J. Alloys Compd. 2008. No. 448 (1–2). P. 325 – 330.
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4. Tretyakov Yu.D., Lepis H. Chemistry and technology of solid-phase materials. Moscow: Moscow State University Press, 1985. 256 p.
5. Zhukovsky V.M. Statics and Dynamics of Solid-Phase Synthesis Processes of Divalent Element Molybdates: Abstract of Cand. Sci. (Chem.). Sverdlovsk, 1974. 41 p.
6. Porai-Koshits M.A., Atovmyan L.O. Crystal Chemistry and Stereochemistry of Molybdenum Coordination Compounds. Ed. Yu.A. Buslaev. Moscow: Nauka, 1974. 232 p.
7. Serezhkin V.N., Efremov V.A., Trunov V.K. Crystal Structure of High-Temperature Modification of Zirconium Molybdate α-Zr(MoO4)2. Russ. Inorg. Chemistry. 1987. Vol. 32. No. 11. Pp. 2695–2699.
8. Mukherjee G.D., Karandikar A.S., Vijayakumar V., Godwal B.K., Achary S.N., Tyagi A.K., Lausi A., Bussetto E. Amorphization and structural evolution of -HfMo2O8 and its high density polymorph -HfMo2O8 at high pressures./ J. Phys. Chem. Solids. 2008. V. 69. P. 35 – 40.
9. ICDD PDF-2 Data Base.
10. Zakharov A.M. State diagrams of binary and ternary systems. Moscow: Metallurgy, 1978. 296 p.
11. Kovba L.M. X-ray Diffraction in Inorganic Chemistry: A Textbook. Moscow: Moscow State University Press, 1991, 256 p.
12. Aksel’rud L.G., Gryn’ Yu.N., Pecharsky V.K. et al. Collected Abstracts of the XIIth European Crystallo-graphic Meeting. Moscow, USSR, 1989. Vol. 3. P. 155.
13. Solodovnikov S.F. Peculiarities of Phase Formation and Crystal Chemistry of Double Molybdates and Tungstates of Alkali and Divalent Metals and Associated Phases: Diss. … Doctor of Chemical Sciences. Novosibirsk: Institute of Inorganic Chemistry, 2000. 324 p.
14. Tsyrenova G.D. Interaction of Rubidium and Cesium Molybdates with Molybdates of Divalent Elements: Diss. … Cand. Chem. Sciences. BNC INE SB RAS USSR, Ulan-Ude, 1989. 173 p.
15. Klevtsov P.V., Kim V.G., Klevtsova R.F., Glinskaya L.A. Solodovnikov S.F. Double molybdates Rb2Me2(MoO4)3 and the crystal structure of Rb2Ni2(MoO4)3. Crystallography. 1988. Vol. 33. No. 1. P. 57 – 62.
16. Solodovnikov S.F., Solodovnikova Z.A. New structural type in the series A2+Me22+(MoO4)3: Rb2Cu2(MoO4)3. Russ. Struct. Chemistry. 1997. Vol. 38. No. 5. P. 914 – 921.
17. Zolotova E.S. Synthesis and physicochemical properties of double molybdates of alkali and tetravalent elements: Abstract of Cand. Sci. (Chem.) Dissertation. Novosibirsk: In-t inorgan. Chemistry, 1986. 25 p.
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23. Bazarov B.G., Klevtsova R.F., Bazarova Zh.G. Synthesis and properties of complex oxide compounds M5A0.5Zr1.5(MoO4)6 (M = K, Tl). J. Inorg. Chemistry. 2000. Vol. 45. No. 9. P. 1453 – 1456.
Pavlova E.T., Tsyrenova G.D., Popova N.N. Phase formation in triple salt systems Rb2MoO4–AMoO4–R(MoO4)2 (A = Mg, Ca, Mn, Co, Ni, Zn, Sr, Cd, Ba, Pb; R = Zr, Hf) and some properties of triple molybdates Rb5A0.5R1.5(MoO4)6. Chemical Bulletin. 2026. 9 (1). 4. https://doi.org/10.58224/2619-0575-2026-9-1-4