Lithium molybdate
Chemical compound
From Wikipedia, the free encyclopedia
Lithium molybdate is an inorgnaic compound with the chemical formula Li2MoO4. It is a white solid forming trigonal crystals.[3]
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Other names
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| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.033.601 |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| Li2MoO4 | |
| Molar mass | 173.82 g/mol |
| Appearance | white odorless powder hygroscopic or transparent crystal |
| Density | 3.07 g/cm3 (pure crystal), 2.66 g/cm3 (hydrated crystal) |
| Melting point | 705 °C (1,301 °F; 978 K) |
| very soluble | |
| Structure[1] | |
| Trigonal | |
| R3 (No. 146) | |
a = 1.432 nm, c = 0.956 nm | |
Formula units (Z) |
18 formula per cell |
| Tetrahedral | |
| Hazards | |
| GHS labelling:[2] | |
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| Warning | |
| H315, H319, H335 | |
| P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Related compounds | |
Other cations |
sodium molybdate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure
At standard conditions it is isostructural to phenacite (Be2SiO4).[1][4] Phrase transformations occur at elevated temperatures.[4]
Preparation
Lithium molybdate can be prepared by reacting lithium carbonate and molybdenum trioxide by a solid-state reaction route followed by recrystallization.[1]
Related compounds
A related lithium molybdenum oxide (Li2MoO2) with a hexagonal layered structure can be prepared by reacting Li2MoO4 with Mo metal at 900 °C.[5] It is isomorphous with α-NaFeO2 (space group R3m, a = b = 2.8663 Å, c = 15.4743 Å, Z = 3).[5]
Uses
Lithium molybdate is used in petroleum cracking catalysts.[3] In the oxidative conversion of n-hexane, the addition of molybdenum species to a Li/MgO catalyst results in the formation of lithium molybdate mixed oxide phases.[6] This diminishes the formation of Li2CO3 in the catalyst, maintaining high surface area and stability.[6]
Lithium molybdate is used as corrosion inhibitor.[7]
Li2MoO4 crystals have been found applicable for cryogenic phonon-scintillation detectors, which are used to investigate some rare nuclear processes.[8]
The use of Li2MoO4 ceramics for antennas has been studied due to their low loss dielectric properties and the possibility to fabricate them by a room-temperature densification method instead of conventional sintering.[9] It has been used with hollow glass microspheres (HGMS) to make low permittivity composite for lenses in lens antennas.[10]