High‐entropy ferroelastic rare‐earth tantalite ceramic: (Y 0.2 Ce 0.2 Sm 0.2 Gd 0.2 Dy 0.2 )TaO 4

2021 ◽  
Author(s):  
Wang Jun ◽  
Fushuo Wu ◽  
Zou Ruoan ◽  
Wu Yueshu ◽  
Gan Mengdi ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Entropy

scholarly journals Synthesis, characterization, and single-crystal growth of a high-entropy rare-earth pyrochlore oxide

2020 ◽  
Vol 4 (10) ◽  
Author(s):  
Candice Kinsler-Fedon ◽  
Qiang Zheng ◽  
Qing Huang ◽  
Eun Sang Choi ◽  
Jiaqiang Yan ◽  
...  
Keyword(s):  
Rare Earth ◽  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystal Growth ◽  
High Entropy ◽  
Pyrochlore Oxide

scholarly journals High-entropy (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)4Al2O9 with good high temperature stability, low thermal conductivity and anisotropic thermal expansivity

2020 ◽  
Author(s):  
Zifan Zhao ◽  
Huimin Xiang ◽  
Heng Chen ◽  
Fu-zhi Dai ◽  
Xiaohui Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Thermal Conductivity ◽  
Thermal Expansion ◽  
Rare Earth ◽  
High Temperature ◽  
Phase Stability ◽  
Temperature Phase ◽  
Low Thermal Conductivity ◽  
High Entropy ◽  
Anisotropic Thermal Expansion

Abstract The critical requirements for the environmental barrier coating (EBC) materials of silicon-based ceramic matrix composites (CMCs) including good tolerance to harsh environments, thermal expansion match with the interlayer mullite, good high-temperature phase stability and low thermal conductivity. Cuspidine-structured rare-earth aluminates RE4Al2O9 have been considered as candidates of EBCs for their superior mechanical and thermal properties, but the phase transition at high temperatures is a notable drawback of these materials. To suppress the phase transition and improve the phase stability, a novel cuspidine-structured rare-earth aluminate solid solution (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)4Al2O9 was designed and successfully synthesized inspired by entropy stabilization effect of high entropy ceramics. The as-synthesized (Nd0.2Sm0.2Eu0.2Y0.2Yb0.2)4Al2O9 exhibits close thermal expansion coefficient (6.96×10-6 /K at 300-1473 K) to that of mullite, good phase stability from 300 K to 1473 K, and low thermal conductivity (1.50 W·m-1·K-1 at room temperature). In addition, strong anisotropic thermal expansion has been observed compared to Y4Al2O9 and Yb4Al2O9. The mechanism for low thermal conductivity is attributed to the lattice distortion and mass difference of the constituent atoms while the anisotropic thermal expansion is due to the anisotropic chemical bonding enhanced by the large size rare earth cations.

Effect of the Rare Earth Element Yttrium on the Structure and Properties of Boron-Containing High-Entropy Alloy

JOM ◽  
2020 ◽  
Vol 72 (6) ◽  
pp. 2332-2339 ◽  
Author(s):  
G. R. Li ◽  
M. Liu ◽  
H. M. Wang ◽  
D. Zhang ◽  
F. Tang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
High Entropy Alloy ◽  
Structure And Properties ◽  
High Entropy ◽  
The Rare Earth

Effect of rare earth oxide CeO2 on microstructure and surface properties of laser cladded CoFeCrNiSiB high-entropy alloy coatings

2019 ◽  
Vol 6 (10) ◽  
pp. 106517 ◽  
Author(s):  
Fengyuan Shu ◽  
Ye Tian ◽  
Sansheng Jiang ◽  
Shaohua Sui ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Surface Properties ◽  
Rare Earth Oxide ◽  
High Entropy Alloy ◽  
High Entropy
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