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New entropy-stabilized oxide with pyrochlore structure: Dy2(Ti0.2Zr0.2Hf0.2Ge0.2Sn0.2)2O7
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-06-10 , DOI: 10.1016/j.jallcom.2021.160773
Florianne Vayer , Claudia Decorse , David Bérardan , Nita Dragoe

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.



中文翻译:

具有烧绿石结构的新型熵稳定氧化物:Dy 2 (Ti 0.2 Zr 0.2 Hf 0.2 Ge 0.2 Sn 0.2 ) 2 O 7

本文报道了一种具有烧绿石结构的新型熵稳定氧化物:Dy 2 (Ti 0.2 Zr 0.2 Hf 0.2 Ge 0.2 Sn 0.2 ) 2 O 7。通过低温多相和高温单相之间可逆相变的存在,使用 X 射线衍射和元素映射 (SEM/EDS) 证明了熵稳定。此外,还研究了一些物理性质: Dy 2 (Ti 0.2 Zr 0.2 Hf 0.2 Ge 0.2 Sn 0.2 ) 2 O 7是顺磁性的(μ eff = 10.95 µ B),它是一种电介质(电阻率为 8.0.10 10 Ω m,室温下的介电常数为 78),并且显示出类似非晶态的热导率(1.4 W m -1 K -1,从室温到 900 °C 保持恒定),对于作为热障涂层的潜在应用很有趣。

更新日期:2021-06-20
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