Thermal expansion and heat capacity of Sm2ScTaO7 – A promising material for thermal barrier coatings

The experimental results presented for Sm2ScTaO7 pyrochlore in this study, temperature dependence of heat capacity and retaining the pyrochlore structure with the temperature variation, as well as the constant value of the thermal expansion coefficient in a wide temperature range, can be considered as evidences for the absence of a previously reported phase transition in the high‐temperature region for this compound. This means that Sm2ScTaO7 pyrochlore is no doubt a promising material for thermal barrier coatings. (a) Heat capacity of Sm2ScTaO7 pyrochlore. Open circles—experimental data, obtained by adiabatic calorimetry, open diamonds—experimental DSC data, black diamonds—corrected DSC data. Dashed line—Neumann‐Kopp rule and (b) Temperature dependence of the lattice parameter a and unit cell volume V under air for Sm2ScTaO7: heating (●) and cooling (○). Error bars are within the symbols.