Titanium(II)_oxide

Titanium(II) oxide

Titanium(II) oxide

Chemical compound

Titanium(II) oxide (TiO) is an inorganic chemical compound of titanium and oxygen. It can be prepared from titanium dioxide and titanium metal at 1500 °C.[1] It is non-stoichiometric in a range TiO0.7 to TiO1.3 and this is caused by vacancies of either Ti or O in the defect rock salt structure.[1] In pure TiO 15% of both Ti and O sites are vacant,[1] as the vacancies allow metal-metal bonding between adjacent Ti centres. Careful annealing can cause ordering of the vacancies producing a monoclinic form which has 5 TiO units in the primitive cell that exhibits lower resistivity.[2] A high temperature form with titanium atoms with trigonal prismatic coordination is also known.[3] Acid solutions of TiO are stable for a short time then decompose to give hydrogen:[1]

2 Ti2+(aq) + 2 H+(aq) → 2 Ti3+(aq) + H2(g)
Quick Facts Names, Identifiers ...

Gas-phase TiO shows strong bands in the optical spectra of cool (M-type) stars.[4][5] In 2017, TiO was claimed to be detected in an exoplanet atmosphere for the first time; a result which is still debated in the literature.[6][7] Additionally, evidence has been obtained for the presence of the diatomic molecule TiO in the interstellar medium.[8]

References

  1. [1]
    Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, ISBN 0-12-352651-5
  2. [2]
    Banus, M. D.; Reed, T. B.; Strauss, A. J. (1972-04-15). "Electrical and Magnetic Properties of TiO and VO". Physical Review B. 5 (8). American Physical Society (APS): 2775–2784. Bibcode:1972PhRvB...5.2775B. doi:10.1103/physrevb.5.2775. ISSN 0556-2805.
  3. [3]
    Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  4. [4]
    Jorgensen, Uffe G. (April 1994). "Effects of TiO in stellar atmospheres". Astronomy and Astrophysics. 284 (1): 179–186. Bibcode:1994A&A...284..179J.
  5. [5]
    "Spectral classification of late-type dwarfs".
  6. [6]
    Sedaghati, Elyar; Boffin, Henri M.J.; MacDonald, Ryan J.; Gandhi, Siddharth; Madhusudhan, Nikku; Gibson, Neale P.; Oshagh, Mahmoudreza; Claret, Antonio; Rauer, Heike (14 September 2017). "Detection of titanium oxide in the atmosphere of a hot Jupiter". Nature. 549 (7671): 238–241. arXiv:1709.04118. Bibcode:2017Natur.549..238S. doi:10.1038/nature23651. PMID 28905896. S2CID 205259502.
  7. [7]
    Espinoza, Nestor; et al. (January 2019). "ACCESS: A featureless optical transmission spectrum for WASP-19b from Magellan/IMACS". MNRAS. 482 (2): 2065–2087. arXiv:1807.10652. Bibcode:2019MNRAS.482.2065E. doi:10.1093/mnras/sty2691.
  8. [8]
    Dyck, H. M.; Nordgren, Tyler E. (2002). "The Effect of TiO Absorption on Optical and Infrared Angular Diameters of Cool Stars". The Astronomical Journal. 124 (1). American Astronomical Society: 541–545. Bibcode:2002AJ....124..541D. doi:10.1086/341039. ISSN 0004-6256. S2CID 117642107.
Share this article:

This article uses material from the Wikipedia article Titanium(II)_oxide, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.