A novel (La0.2Sm0.2Eu0.2Gd0.2Tm0.2)2Zr2O7 high-entropy ceramic nanofiber with excellent thermal stability. Issue 20 (15th October 2021)

• Record Type: Journal Article
• Authors: Zhao, Weijun; Yang, Fan; Liu, Zhaoli; Chen, Heng; Shao, Zhiheng; Zhang, Xuesong; Wang, Kaixian; Xue, Liyan
• Is Part Of: Ceramics international. Volume 47:Issue 20(2021)
• Page Start: 29379
• Page End: 29385
• Publication Date: 2021-10-15
• Subjects: Rare-earth zirconates -- High-entropy ceramics -- Ceramic fiber materials -- Slow diameter growth rate; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.07.105
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The microstructure of ceramic fibers is destroyed, as a result of phase transformation and fiber diameter growth. In this work, (La0.2 Sm0.2 Eu0.2 Gd0.2 Tm0.2 )2 Zr2 O7 high-entropy ceramic nanofibers (HE-RE2 Zr2 O7 fibers) were prepared by the electrospinning method for the first time. XRD and TEM analyses indicated that the HE-RE2 Zr2 O7 fibers existed as a pure phase with a uniform distribution of rare-earth elements. SEM images showed that the HE-RE2 Zr2 O7 fibers retained a dense structure up to 1000 °C for 0 h–5 h. Upon annealing at 1000 °C for 0 h–2.5 h, the mean diameter of the HE-RE2 Zr2 O7 fibers increased from 169.34 nm to 176.95 nm, and the mean diameter of the La2 Zr2 O7 fibers increased from 174.52 nm to 215.14 nm. The thermal conductivity of the HE-RE2 Zr2 O7 fibers was approximately 0.23 W m −1 K −1 . The sluggish diffusion effect of high-entropy materials and the slow fiber diameter growth and excellent thermal stability of the HE-RE2 Zr2 O7 fibers promote the broad application of these fibers as high-temperature heat insulation materials.