材料科学
稀土
氧化钇稳定氧化锆
热导率
拉曼光谱
热膨胀
陶瓷
兴奋剂
萤石
分析化学(期刊)
矿物学
冶金
立方氧化锆
复合材料
光电子学
光学
化学
物理
色谱法
作者
Jiatong Zhu,Xuanyu Meng,Jie Xu,Ping Zhang,Zhihao Lou,Michael J. Reece,Feng Gao
标识
DOI:10.1016/j.jeurceramsoc.2020.08.070
摘要
A new entropy-stabilized rare earth niobates (RE3NbO7, RE = Dy, Y, Ho, Er, Yb) system with disordered defective fluorite structure was prepared by solid-state method. XRD, Raman and EDS results confirmed the homogeneous distribution and equimolar doping of rare earth cations. High-entropy RE3NbO7 ceramics showed smaller grain size compared with single rare earth niobates owing to the sluggish grain diffusion. Due to the increased configuration entropy, (Dy0.2Ho0.2Er0.2Y0.2Yb0.2)3NbO7 (5RE3NbO7) has enhanced mechanical properties (Hv = 9.51 GPa, KⅠC = 2.13 MPa m0.5), a high thermal expansion coefficient (10.2 × 10−6 K-1, 1200℃) and ultra-low thermal conductivity (0.724 W m-1 K-1, 25℃). These results suggest that the material can be used as a new type of thermal barrier coatings as alternative to yttria-stabilized zirconia.
科研通智能强力驱动
Strongly Powered by AbleSci AI