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Total neutron scattering investigation of the structure of a cobalt gallium oxide spinel prepared by solvothermal oxidation of gallium metal

DOI: 10.1088/0953-8984/25/45/454212 DOI Help

Authors: Helen Y. Playford (Department of Chemistry, University of Warwick, U.K.) , Alex C. Hannon (ISIS Facility, Rutherford Appleton Laboratory, U.K.) , Matthew G. Tucker (ISIS Facility, Rutherford Appleton Laboratory, U.K) , Martin R. Lees (Department of Physics, University of Warwick, U.K.) , Richard I. Walton (Department of Chemistry, University of Warwick, U.K.)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 25 (45)

State: Published (Approved)
Published: November 2013

Abstract: A new solvothermal synthesis route to mixed-metal gallium oxides with the spinel structure has been developed for ternary oxides of ideal composition Ga 3-X MX04-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.

Subject Areas: Materials, Chemistry, Physics

Instruments: B18-Core EXAFS

Added On: 30/09/2014 10:02

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