Abstract
Thermophysical properties of the ternary oxides NbAlO4 and TaAlO4 are experimentally determined. For NbAlO4, the molar heat capacity is 98.9 J (mol·K)−1 at 0 ∘C up to 155.6 J (mol·K)−1 at 950 ∘C and for TaAlO4 97.1 J (mol·K)−1 at 0 ∘C up to 154.2 J (mol·K)−1 at 950 ∘C, respectively. Maier-Kelley polynomials are provided for the molar heat capacities. Thermal diffusivities in the range from 20 ∘C to 700 ∘C (αNbAlO4: from 0.009 to 0.004 cm2·s−1 and αTaAlO4: from 0.017 to 0.005 cm2·s−1), bulk densities at 25 ∘C (ρNbAlO4= 3.94 g·cm−3 and ρTaAlO4= 6.07 g·cm−3) and melting points of the oxides are measured, and the thermal conductivities are calculated from these properties. The thermal conductivity from 20 ∘C to 700 ∘C of NbAlO4λNbAlO4 is in the range from 0.020 to 0.013 W·cm−1·K−1 and of TaAlO4λTaAlO4 in the range from 0.039 to 0.015 W·cm−1·K−1, respectively. A porosity correction for thermal conductivities is applied, and with that, data for perfectly dense material are provided.
Published Version
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