Silver molybdate

Silver molybdate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.962
  • InChI=1S/2Ag.Mo.4O/q2*+1;;;;2*-1 Y
    Key: MHLYOTJKDAAHGI-UHFFFAOYSA-N Y
  • InChI=1/2Ag.Mo.4O/q2*+1;;;;2*-1/r2Ag.MoO4/c;;2-1(3,4)5/q2*+1;-2
    Key: ^@€×,&#+=+÷×¥× ndnzjsnssi-QWQXGURBAC
  • [Ag+].[Ag+].[O-][Mo]([O-])(=O)=O
Properties
Ag2MoO4
Molar mass 375.67 g/mol
Appearance yellow crystals
Density 6.18 g/cm3, solid
Melting point 483 °C (901 °F; 756 K)
slightly soluble
Structure
cubic
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Silver molybdate is an inorganic compound with the chemical formula Ag2MoO4. It is a yellow solid that crystallizes in the cubic system and exhibits dimorphism. It is often used in glass.

Structure

Silver molybdate crystals present two types of electronic structure, depending on the pressure conditions to which the crystal is subjected.[1] At room temperature, it exhibits a spinel-type cubic structure, known as β-Ag2MoO4, which is more stable in nature. However, when exposed to high hydrostatic pressure, the tetragonal α-Ag2MoO4 forms as a metastable phase.[2]

Synthesis and properties

α-Ag2MoO4

α-Ag2MoO4 can be prepared by solution-phase precipitation under ambient conditions, using 3-bis(2-pyridyl)pyrazine (dpp) as a doping agent.[3] The pH of the starting solution influences the growth and formation processes of distinct heterostructures (brooms, flowers and rods).[4][5]

β-Ag2MoO4

β-Ag2MoO4 crystals can be prepared by solid-state reaction or oxide mixture at high temperature,[6] melt-quenching,[7] and Czochralski growth.[8]

Additional methods include co-precipitation, microwave-assisted hydrothermal synthesis,[9] a dynamic template route using polymerization of acrylamide assisted templates,[10] and an impregnation/calcination method.[11]

β-Ag2MoO4 microcrystals can be synthesized by precipitation employing polar solvents.[12]

Photocatalytic properties of β–Ag2MoO4 crystals can be improved through hydrothermal processing at different temperatures.[13] The replacement of Ag atoms with Zn to form silver-zinc molybdate [β–(Ag2−2xZnx)MoO4] microcrystals by a sonochemical method also leads to improvements.[14] These crystals are able to degrade rhodamine B and Remazol Brilliant Violet 5R.[13][14]

Ag-Ag2MoO4 composites

Ag-Ag2MoO4 composites can be prepared by microwave-assisted hydrothermal synthesis. These composites present photocatalytic activity for the degradation of rhodamine B under visible light.[15]

Other properties

Ag2MoO4 mixed with graphite acts as a good lubricant for Ni-based composites, improving the tribological properties of the system.[16]

References

  1. ^ Arora, A. K.; Nithya, R.; Misra, Sunasira; Yagi, Takehiko (2012-12-01). "Behavior of silver molybdate at high-pressure". Journal of Solid State Chemistry. 196: 391–397. Bibcode:2012JSSCh.196..391A. doi:10.1016/j.jssc.2012.07.003.
  2. ^ Beltrán, Armando; Gracia, Lourdes; Longo, Elson; Andrés, Juan (2014-02-20). "First-Principles Study of Pressure-Induced Phase Transitions and Electronic Properties of Ag2MoO4". The Journal of Physical Chemistry C. 118 (7): 3724–3732. doi:10.1021/jp4118024. ISSN 1932-7447.
  3. ^ Ng, Choon Hwee Bernard; Fan, Wai Yip (2015-06-03). "Uncovering Metastable α-Ag2MoO4 Phase Under Ambient Conditions. Overcoming High Pressures by 2,3-Bis(2-pyridyl)pyrazine Doping". Crystal Growth & Design. 15 (6): 3032–3037. doi:10.1021/acs.cgd.5b00455. ISSN 1528-7483.
  4. ^ Singh, D. P.; Sirota, B.; Talpatra, S.; Kohli, P.; Rebholz, C.; Aouadi, S. M. (2012-03-09). "Broom-like and flower-like heterostructures of silver molybdate through pH controlled self assembly". Journal of Nanoparticle Research. 14 (4): 781. Bibcode:2012JNR....14..781S. doi:10.1007/s11051-012-0781-0. hdl:10533/128243. ISSN 1388-0764. S2CID 96310636.
  5. ^ Fodjo, Essy Kouadio; Li, Da-Wei; Marius, Niamien Paulin; Albert, Trokourey; Long, Yi-Tao (2013-01-23). "Low temperature synthesis and SERS application of silver molybdenum oxides". Journal of Materials Chemistry A. 1 (7): 2558–2566. doi:10.1039/c2ta01018f.
  6. ^ Suthanthiraraj, S. Austin; Premchand, Y. Daniel (2004-05-01). "Molecular structural analysis of 55mol% CuI-45mol% Ag2MoO4 solid electrolyte using XPS and laser raman techniques". Ionics. 10 (3–4): 254–257. doi:10.1007/BF02382825. ISSN 0947-7047. S2CID 95974644.
  7. ^ Rocca, F; Kuzmin, A; Mustarelli, P; Tomasi, C; Magistris, A (1999-06-01). "XANES and EXAFS at Mo K-edge in (AgI)1−x(Ag2MoO4)x glasses and crystals". Solid State Ionics. 121 (1–4): 189–192. doi:10.1016/S0167-2738(98)00546-3.
  8. ^ Brown, Stephen; Marshall, Alison; Hirst, Philip (1993-12-20). "The growth of single crystals of lead molybdate by the Czochralski technique". Materials Science and Engineering: A. 173 (1–2): 23–27. doi:10.1016/0921-5093(93)90179-I.
  9. ^ Gouveia, A. F.; Sczancoski, J. C.; Ferrer, M. M.; Lima, A. S.; Santos, M. R. M. C.; Li, M. Siu; Santos, R. S.; Longo, E.; Cavalcante, L. S. (2014-06-02). "Experimental and Theoretical Investigations of Electronic Structure and Photoluminescence Properties of β-Ag2MoO4 Microcrystals". Inorganic Chemistry. 53 (11): 5589–5599. doi:10.1021/ic500335x. ISSN 0020-1669. PMID 24840935.
  10. ^ Jiang, Hao; Liu, Jin-Ku; Wang, Jian-Dong; Lu, Yi; Yang, Xiao-Hong (2015-07-14). "Thermal perturbation nucleation and growth of silver molybdate nanoclusters by a dynamic template route". CrystEngComm. 17 (29): 5511–5521. doi:10.1039/c5ce00039d.
  11. ^ Zhao, Songjian; Li, Zhen; Qu, Zan; Yan, Naiqiang; Huang, Wenjun; Chen, Wanmiao; Xu, Haomiao (2015-10-15). "Co-benefit of Ag and Mo for the catalytic oxidation of elemental mercury". Fuel. 158: 891–897. doi:10.1016/j.fuel.2015.05.034.
  12. ^ Cunha, F. S.; Sczancoski, J. C.; Nogueira, I. C.; Oliveira, V. G. de; Lustosa, S. M. C.; Longo, E.; Cavalcante, L. S. (2015-10-28). "Structural, morphological and optical investigation of β-Ag 2 MoO 4 microcrystals obtained with different polar solvents". CrystEngComm. 17 (43): 8207–8211. doi:10.1039/c5ce01662b.
  13. ^ a b Sousa, Giancarlo da Silva; Nobre, Francisco Xavier; Júnior, Edgar lves Araújo; Sambrano, Julio Ricardo; Albuquerque, Anderson dos Reis; Bindá, Rosane dos Santos; Couceiro, Paulo Rogério da Costa; Brito, Walter Ricardo; Cavalcante, Laecio Santos; Santos, Maria Rita Morais; Matos, Jose Milton Elias (20 July 2018). "Hydrothermal synthesis, structural characterization and photocatalytic properties of β--Ag2MoO4 microcrystals: Correlation between experimental and theoretical data". Arabian Journal of Chemistry. 13: 2806–2825. doi:10.1016/j.arabjc.2018.07.011.
  14. ^ a b Coimbra, D.W.; Cunha, F.S.; Sczancoski, J.C.; de Carvalho, J.F.S.; de Macêdo, F.R.C.; Cavalcante, L.S. (2019). "Structural refinement, morphology and photocatalytic properties of β-(Ag2−2xZnx)MoO4 microcrystals synthesized by the sonochemical method". Journal of Materials Science: Materials in Electronics. 30 (2): 1322–1344. doi:10.1007/s10854-018-0401-6. S2CID 139865569.
  15. ^ Li, ZhaoQian; Chen, XueTai; Xue, Zi-Ling (2013-02-22). "Microwave-assisted hydrothermal synthesis of cube-like Ag-Ag2MoO4 with visible-light photocatalytic activity". Science China Chemistry. 56 (4): 443–450. doi:10.1007/s11426-013-4845-5. ISSN 1674-7291. S2CID 100948033.
  16. ^ Liu, Eryong; Gao, Yimin; Jia, Junhong; Bai, Yaping (2013-03-24). "Friction and Wear Behaviors of Ni-based Composites Containing Graphite/Ag2MoO4 Lubricants". Tribology Letters. 50 (3): 313–322. doi:10.1007/s11249-013-0131-0. ISSN 1023-8883. S2CID 137297325.
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