Atomic-scale investigation on the growth behavior of rod shape ZrB2. Issue 17 (1st December 2019)

• Record Type: Journal Article
• Authors: Song, Shaolei; Xie, Chen; Li, Rong; Ran, Songlin; Hu, Pengfei; Zhen, Qiang; Liu, Jingbo; Bashir, Sajid
• Is Part Of: Ceramics international. Volume 45:Issue 17(2019)Part B
• Page Start: 23849
• Page End: 23852
• Publication Date: 2019-12-01
• Subjects: Ultra-high temperature ceramics -- In situ TEM -- Crystal growth -- Rod shape; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.08.067
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The microstructure evolution in the growth of zirconium diboride (ZrB2 ) rods was directly observed with the help of high resolution-transmission electron microscopy. Key features of layered structure and step contours are proposed to interpret the growth mechanism of the new layer on the surface of ZrB2 . Under electron beam irradiation, on the surface of the ZrB2 rod amorphous layer first nucleated and grew into two-dimensional (2D) islands. Then with the continuous migration and rearrangement of atoms, the 2D islands began to interconnect and formed a continuous new layer. The energies that govern migration and diffusion of atoms in new ZrB2 layer comes from a high density of islands, interface defects and the distortion energy caused by atomic mismatches in the initial growth stage of each layer.