On the influence of inversion on thermal properties of magnesium gallium spinel
Abstract
Measurements of thermal diffusivity appa (using laser flash analysis) for temperatures from 100 C to 1200 C and of the inversion parameter x (using X-ray analysis) for the single crystal spinel MgGa2O4 have been performed. X-ray analysis showed a small change in x for samples annealed at 800 C (x = 0.838) and 1200 C (x = 0.834). Thermal diffusivity revealed a significant rise of appa for temperatures higher than 950 C, deviating from the typical 1/T drop of appa. An additional systematic rise of appa with time is observed for temperatures between 950 C and 1100 C. A connection between cation disordering processes typical for spinels at elevated temperatures and the observed deviation of appa is proposed: Data indicate that cations changing their occupancy site at equilibration processes contribute significantly to appa and therefore represent a new type of heat transport.
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