The Double Molybdate Rb₂Ba(MoO₄)₂: Synthesis, Crystal Structure, Optical, Thermal, Vibrational Properties, and Electronic Structure

Abstract

The double molybdate Rb 2 Ba(MoO 4 ) 2 was synthesized by high temperature solid-state reaction. According to the single-crystal X-ray diffraction structure determination, it is isostructural to the mineral Palmierite K 2 Pb(SO 4 ) 2 in the trigonal space group R3m. Its structure can be described as layers of MoO 4 tetrahedra corner-sharing with distorted BaO 6 octahedra, while the layers are separated by bi-layers of rubidium cations in 10-coordinate environment. UV/Vis-NIR spec-

Report of the Double-Molybdate Phase Cs2Ba(MoO4)2 with a Palmierite Structure and Its Thermodynamic Characterization

“…Anti-site mixing was not reported in Rb 2 Ba(MoO 4 ) 2 . 46 It was tested for Cs 2 Ba(MoO 4 ) 2 , but the Rietveld refinement did not indicate its occurrence, as could be expected from the large difference in ionic radii between the Ba 2+ and Cs + cations.…”

Fabrication of Metal Molybdate Micro/Nanomaterials for Electrochemical Energy Storage

“…a) Reproduced with permission . Copyright 2009, Springer‐Verlag 2009. b) Reproduced with permission . Copyright 2015, WILEY‐VCH Verlag GmbH & Co. c) Reproduced with permission .…”

“…This is a traditional preparation method for molybdates, and early synthesis of molybdates extensively used this method. Zhou et al, through traditional solid‐state reaction techniques, synthesized polycrystalline samples of Rb 2 Ba(MoO 4 ) 2 . Appropriate stoichiometric ratios of MoO 3 , Rb 2 CO 3 and BaCO 3 were thoroughly mixed together and added into a platinum crucible.…”

“…Nanocomposites with many metal molybdate compounds have been successfully synthesized, taking advantage of the synergistic effects between the different metal molybdate components. Nowadays, a range of practical fabrication methods has been used to create specific metal molybdate compounds such as: hydro/solvothermal methods; coprecipitation methods; sonochemical methods; combustion methods; sol–gel methods; solid‐state methods . In recent years, sonochemical methods and hydro/solvothermal methods have been extensively investigated to synthesize metal molybdate compounds.…”

“…In this review, we systematically summarize the synthetic methods of metal molybdates based on related materials, for example: Hydro/solvothermal methods; coprecipitation methods; sonochemical methods; combustion methods; sol–gel methods; and solid‐state methods . Subsequently, the design and optimization of electrode materials are carefully discussed, followed by the evidence of electrochemical performance of these compounds (e.g., MnMoO 4 , CoMoO 4 , NiMoO 4 , etc.)…”