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Crystal structure, Raman characterization, and magnetic properties of the hydrate RbYb(MoO4)2, H2O

Abstract : The millimeter-sized single crystals of RbYb(MoO4)2, H2O monohydrate were successfully grown using the high-temperature self-flux method. This colorless and shiny double molybdate crystallizes in the monoclinic system with space group C2/c. Its lamellar structure can be described with YbO8 regular square antiprisms sharing edges into chains aligned along the [001] direction. A layered arrangement occurs perpendicularly to the [010] direction with MoO4 tetrahedra and YbO8 polyhedra associated in complex anionic layers alternating with cationic layers made of Rb + ions surrounded by eight oxygen atoms into flattened RbO8 square antiprisms. Raman investigation at room temperature shows a weak vibration at 737 cm-1 attributed to the existence of pseudo-double-bridges Mo-{O2}-Mo, while the absence of bands in the 500-700 cm-1 frequency range confirms the lack of covalent MoO -Mo single-bridge. Magnetic characterizations suggest that the title compound presents an antiferromagnetic coupling between the Yb 3+ centers at T ≤ 10 K.
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https://hal.archives-ouvertes.fr/hal-03769091
Contributor : Pascale Armand Connect in order to contact the contributor
Submitted on : Monday, September 5, 2022 - 11:34:28 AM
Last modification on : Wednesday, October 12, 2022 - 3:59:41 AM

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M. Tillard, D. Granier, L. Daenens, C. Reibel, Pascale Armand. Crystal structure, Raman characterization, and magnetic properties of the hydrate RbYb(MoO4)2, H2O. Journal of Solid State Chemistry, 2022, 309, pp.122953. ⟨10.1016/j.jssc.2022.122953⟩. ⟨hal-03769091⟩

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