Characterization of novel high-entropy (La0.2Nd0.2Sm0.2Dy0.2Yb0.2)2Zr2O7 electrospun ceramic nanofibers

We present a simple way to fabricate high-entropy (La 0.2 Nd 0.2 Sm 0.2 Dy 0.2 Yb 0.2 ) 2 Zr 2 O 7 (HE-RE 2 Zr 2 O 7 ) ceramic nanofibers using the electrospinning and annealing processing in this work. The microstructure of nanofibers was characterized by thermal gravity-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. Meanwhile, the diameter and grain growth of HE-RE 2 Zr 2 O 7 nanofibers under 1000 °C was analyzed. Results indicate that HE-RE 2 Zr 2 O 7 nanofibers can be prepared at temperatures above 400 °C and the crystallite size can be controlled by annealing temperature. Both diameter and the grain growth of HE-RE 2 Zr 2 O 7 nanofibers are lower than that of La 2 Zr 2 O 7 nanofibers, attributed to the sluggish diffusion effect. The advantages of HE-RE 2 Zr 2 O 7 nanofibers can further enlarge the application of nanofibers in the aspect of high-temperature thermal insulation materials.