Chemistry:Lithium molybdate

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Lithium molybdate
Names
Other names
  • Lithium molybdate(VI)
  • Dilithium molybdate
  • Dilithium dioxido(dioxo)molybdenum
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 236-977-7
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
18 formula per cell
Tetrahedral
Hazards
GHS pictograms GHS07: Harmful
GHS Signal word Warning
H315, H319, H335
P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondFlammability code 0: Will not burn. E.g. waterHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
0
3
1
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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Infobox references

Lithium molybdate is an inorgnaic compound with the chemical formula Li2MoO4. It is a white solid forming trigonal crystals.[3]

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]

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]

References

  1. ↑ 1.0 1.1 1.2 Barinova, Olga; Kirsanova, Svetlana; Sadovskiy, Andrey; Avetissov, Igor (2014-09-01). "Properties of Li2MoO4 single crystals grown by Czochralski technique". Journal of Crystal Growth. Proceedings of 17th International Conference on Crystal Growth and Epitaxy (ICCGE-17) 401: 853–856. doi:10.1016/j.jcrysgro.2013.10.051. ISSN 0022-0248. https://www.sciencedirect.com/science/article/pii/S0022024813007331. 
  2. ↑ "Lithium molybdate" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/6093689#section=Safety-and-Hazards. 
  3. ↑ 3.0 3.1 Perry, Dale L. (2016-04-19) (in en). Handbook of Inorganic Compounds. CRC Press. p. 240. ISBN 978-1-4398-1462-8. https://books.google.com/books?id=SFD30BvPBhoC. 
  4. ↑ 4.0 4.1 Saraiva, G. D.; Paraguassu, W.; Freire, P. T. C.; Ramiro de Castro, A. J.; de Sousa, F. F.; Mendes Filho, J. (2017-07-05). "Temperature induced phase transformations on the Li2MoO4 system studied by Raman spectroscopy". Journal of Molecular Structure 1139: 119–124. doi:10.1016/j.molstruc.2017.03.038. ISSN 0022-2860. https://www.sciencedirect.com/science/article/pii/S0022286017302995. 
  5. ↑ 5.0 5.1 Aleandri, Lorraine E.; McCarley, Robert E. (2002-05-01). "Hexagonal lithium molybdate, LiMoO2: a close-packed layered structure with infinite molybdenum-molybdenum-bonded sheets" (in EN). Inorganic Chemistry 27 (6): 1041–1044. doi:10.1021/ic00279a021. https://pubs.acs.org/doi/pdf/10.1021/ic00279a021. Retrieved 2026-01-25. 
  6. ↑ 6.0 6.1 Boyadjian, Cassia; Lefferts, Leon (2020-03-23). "Promoting Li/MgO Catalyst with Molybdenum Oxide for Oxidative Conversion of n-Hexane" (in en). Catalysts 10 (3): 354. doi:10.3390/catal10030354. ISSN 2073-4344. 
  7. ↑ Itoh, Masahiko; Midorikawa, Heihachiro; Izumiya, Masakiyo; Aizawa, Michihiko; Tanno, Kazuo (1990). "Corrosion Inhibition of Carbon Steel by Lithium Molybdate in Concentrated LiBr Solutions at Elevated Temperatures". Corrosion Engineering 39 (6): 298–302. doi:10.3323/jcorr1974.39.6_298. https://www.jstage.jst.go.jp/article/jcorr1974/39/6/39_6_298/_article/-char/en. 
  8. ↑ Barinova, O. P.; Danevich, F. A.; Degoda, V. Ya.; Kirsanova, S. V.; Kudovbenko, V. M.; Pirro, S.; Tretyak, V. I. (2010-01-21). "First test of Li2MoO4 crystal as a cryogenic scintillating bolometer". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 613 (1): 54–57. doi:10.1016/j.nima.2009.11.059. Bibcode: 2010NIMPA.613...54B. https://zenodo.org/record/895764. 
  9. ↑ Kähäri, Hanna; Ramachandran, Prasadh; Juuti, Jari; Jantunen, Heli (2017). "Room-Temperature Densified Li2MoO4 Ceramic Patch Antenna and the Effect of Humidity" (in en). International Journal of Applied Ceramic Technology 14: 50–55. doi:10.1111/ijac.12615. ISSN 1744-7402. 
  10. ↑ Kokkonen, Mikko; Nelo, Mikko; Chen, Jiangcheng; Myllymäki, Sami; Jantunen, Heli (2020). "Low Permittivity Environmentally Friendly Lenses for Ku Band". Progress in Electromagnetics Research Letters 93: 1–7. doi:10.2528/pierl20060108. 

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