Abstract
This article reports on a new entropy-stabilized oxide with the pyrochlore structure: Dy2(Ti0.2Zr0.2Hf0.2Ge0.2Sn0.2)2O7. The entropy-stabilization was demonstrated using X-ray diffraction and elemental mapping (SEM/EDS) by the existence of a reversible phase transition between a low-temperature multiphase and a high-temperature single-phase. Moreover, some physical properties were investigated: Dy2(Ti0.2Zr0.2Hf0.2Ge0.2Sn0.2)2O7 is paramagnetic (with µeff = 10.95 µB), it is a dielectric (resistivity of 8.0.1010 Ω m and a dielectric constant of 78 at room temperature) and it displays an amorphous-like thermal conductivity (1.4 W m−1 K−1, constant from room temperature to 900 °C), interesting for potential applications as thermal barrier coating.
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