Structure, characterization, and properties of BaMoO4 and BaKYb(MoO4)3 flux-grown single-crystals - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2022

Structure, characterization, and properties of BaMoO4 and BaKYb(MoO4)3 flux-grown single-crystals

Résumé

Crystals of the barium molybdates BaKYb(MoO4)3 and BaMoO4 were obtained by spontaneous nucleation from high-temperature flux experiments. The compounds were characterized by energy-dispersive spectrometry (EDS) and Raman spectroscopy, and their structure was solved from single-crystal X-ray diffraction data at room temperature. BaMoO4 crystallizes in the tetragonal I41/a symmetry with a = b = 5.5723(4) and c = 12.7954(9) Å. With the scheelite-type structure, BaMoO4 displays sharp and intense lines in its FT-Raman spectrum registered at room temperature. The new triple molybdate BaKYb(MoO4)3 is described in a monoclinic lattice C2/c of parameters a = 17.3517(5), b = 12.1477(4), c = 5.2481(2) Å,  = 105.344(2)°. The Yb 3+ ions are surrounded by oxygen leading to YbO8 coordination polyhedra while atomic disorder is observed for the cations Ba 2+ and K + , statistically sharing their positions inside 8-vertex coordination polyhedra. The Raman spectrum confirms the presence of distorted MoO4 tetrahedra for the BaKYb(MoO4)3 molybdate. Investigation of its magnetic properties was undertaken in order to check whether a magnetic ordering occurs at low temperature.
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Dates et versions

hal-03499867 , version 1 (21-12-2021)

Identifiants

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Monique Tillard, D. Granier, C. Reibel, L. Daenens, P. Armand. Structure, characterization, and properties of BaMoO4 and BaKYb(MoO4)3 flux-grown single-crystals. Journal of Solid State Chemistry, 2022, 306, pp.122809. ⟨10.1016/j.jssc.2021.122809⟩. ⟨hal-03499867⟩
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