Structure and Conductivity of Lithium-Doped Fluorite-Like Molybdates Nd5Mo3O16

Abstract

Rare-earth molybdenum-containing oxides of the nominal composition Li_xNd\(_{{5-x}}\)Mo₃O\(_{{16\, \pm \,\delta }}\) (x = 0, 0.05, 0.15, 0.25) with a fluorite-related structure have been obtained for the first time as single crystals grown from flux and by solid-phase synthesis in air in the form of polycrystalline samples. The new phases are characterized using X-ray diffraction analysis, simultaneous thermal analysis, and impedance spectroscopy. X-ray diffraction analysis showed that lithium atoms are localized near the positions of rare-earth cations. The chemical formula of the investigated single crystal is Li_0.216Nd_4.784Mo₃O\(_{{14.1 + \delta }}\). The low lithium content did not affect significantly the ability of the studied phases to dissociative absorption of water but led to a decrease in the total conductivity of Li_xNd\(_{{5-x}}\)Mo₃O\(_{{16\, \pm \,\delta }}\) lithium ceramics.