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Total neutron scattering investigation of the structure of a cobalt gallium oxide spinel prepared by solvothermal oxidation of gallium metal
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Playford, Helen Y., Hannon, Alex C., Tucker, Matthew G., Lees, Martin R. and Walton, Richard I. (2013) Total neutron scattering investigation of the structure of a cobalt gallium oxide spinel prepared by solvothermal oxidation of gallium metal. Journal of Physics : Condensed Matter, Volume 25 (Number 45). p. 454212. Article number 454212. doi:10.1088/0953-8984/25/45/454212
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Official URL: http://dx.doi.org/10.1088/0953-8984/25/45/454212
Abstract
A new solvothermal synthesis route to mixed-metal gallium oxides with the spinel structure has been developed for ternary oxides of ideal composition Ga3−xMxO4−y (M=Co, Zn, Ni). The structure of the novel cobalt gallate produced in this manner, Ga1.767(8)Co0.973(8)O3.752(8), has been determined from total neutron scattering to be a partially defective spinel with mixed-valent cobalt (approximately 25% Co3+ and 75% Co2+) and with vacancies on approximately 6% of oxygen sites. Pair distribution function (PDF) analysis reveals significant local deviations from the average cubic structure, which are attributed to the conflicting coordination preferences of the Co2+ (potential Jahn–Teller distortion) and Ga3+ (Ga off-centring). Reverse Monte Carlo (RMC) modelling supports this conclusion since different metal–oxygen bond-distance distributions are found for the two cations in the refined configuration. An investigation of magnetic properties shows evidence of short-range magnetic order and spin-glass-like behaviour, consistent with the structural disorder of the material.
| Item Type: | Journal Article | ||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics |
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| Journal or Publication Title: | Journal of Physics : Condensed Matter | ||||
| Publisher: | IOP Publishing | ||||
| ISSN: | 0953-8984 | ||||
| Official Date: | 13 November 2013 | ||||
| Dates: |
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| Volume: | Volume 25 | ||||
| Number: | Number 45 | ||||
| Page Range: | p. 454212 | ||||
| Article Number: | Article number 454212 | ||||
| DOI: | 10.1088/0953-8984/25/45/454212 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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