Abstract
An equimolar quaternary (Gd0.25Sm0.25Yb0.25Y0.25)3TaO7 high-entropy oxide was synthesised using the sol-gel technique and high-temperature calcination technology. The obtained nanopowder and compact bulk sample are all of the single fluorite phase. The relatively low thermal conductivity (1.170‒1.211W·m‒1·K‒1, 50‒1000 °C) of bulk sample is ascribed to the typical phonon scattering mechanisms and high-entropy distortion effect. The high average thermal expansion coefficient reaches 10.855 × 10–6 K−1 (1000–1400 °C) owing to the relatively weak ionic bond strength and lattice energy. The outstanding phase stability up to 1400 °C is in favour of lengthening the service life at high temperatures. These results reveal that (Gd0.25Sm0.25Yb0.25Y0.25)3TaO7 high-entropy oxide can be explored as a promising thermal barrier coating material.
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