Phase formation in the systems Li{sub 2}MoO{sub 4}-K{sub 2}MoO{sub 4}-Ln{sub 2}(MoO{sub 4}){sub 3} (Ln=La, Nd, Dy, Er) and properties of triple molybdates LiKLn{sub 2}(MoO{sub 4}){sub 4}
- Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Sakh'yanova Street 6, Ulan-Ude, 670047 Buryat Republic (Russian Federation)
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Akad. Lavrent'ev Ave. 3, Novosibirsk 630090 (Russian Federation)
Subsolidus phase relations in the systems Li{sub 2}MoO{sub 4}-K{sub 2}MoO{sub 4}-Ln{sub 2}(MoO{sub 4}){sub 3} (Ln=La, Nd, Dy, Er) were determined. Formation of LiKLn{sub 2}(MoO{sub 4}){sub 4} was confirmed in the systems with Ln=Nd, Dy, Er at the LiLn(MoO{sub 4}){sub 2}-KLn(MoO{sub 4}){sub 2} joins. No intermediate phases of other compositions were found. No triple molybdates exist in the system Li{sub 2}MoO{sub 4}-K{sub 2}MoO{sub 4}-La{sub 2}(MoO{sub 4}){sub 3}. The join LiLa(MoO{sub 4}){sub 2}-KLa(MoO{sub 4}){sub 2} is characterized by formation of solid solutions. Triple molybdates LiKLn{sub 2}(MoO{sub 4}){sub 4} for Ln=Nd-Lu, Y were synthesized by solid state reactions (single phases with ytterbium and lutetium were not prepared). Crystal and thermal data for these molybdates were determined. Compounds LiKLn{sub 2}(MoO{sub 4}){sub 4} form isostructural series and crystallized in the monoclinic system with the unit cell parameters a=5.315-5.145A, b=12.857-12.437A, c=19.470-19.349A, {beta}=92.26-92.98{sup o}. When heated, the compounds decompose in solid state to give corresponding double molybdates. The dome-shaped curve of the decomposition temperatures of LiMLn{sub 2}(MoO{sub 4}){sub 4} has the maximum in the Gd-Tb-Dy region. While studying the system Li{sub 2}MoO{sub 4}-K{sub 2}MoO{sub 4}-Dy{sub 2}(MoO{sub 4}){sub 3} we revealed a new low-temperature modification of KDy(MoO{sub 4}){sub 2} with the triclinic structure of {alpha}-KEu(MoO{sub 4}){sub 2} (a=11.177(2)A, b=5.249(1)A, c=6.859(1)A, {alpha}=112.33(2){sup o}, {beta}=111.48(1){sup o}, {gamma}=91.30(2){sup o}, space group P1-bar , Z=2)
- OSTI ID:
- 20725937
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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