Screw dislocation assisted spontaneous growth of single-crystalline α-Al2O3 microrods. (December 2018)

• Record Type: Journal Article
• Authors: Chu, Yanhui; Jing, Siyi; Liu, Da; Ye, Beilin
• Is Part Of: Composites communications. Volume 10(2018)
• Page Start: 93
• Page End: 96
• Publication Date: 2018-12
• Subjects: Crystal growth -- Vapor deposition -- Alumina -- Dislocation
• DOI: 10.1016/j.coco.2018.08.003
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: Herein we reported a simple chemical vapor deposition approach to synthesize single crystal α-Al2 O3 microrods with diameters of 2–4 μm and lengths of 10–30 μm on the as-prepared SiC-Si-Al2 O3 ceramics based on the screw dislocation growth. Two types of evidence for screw dislocation growth have been conclusively observed in the as-synthesized microrods: scanning electron microscopy analysis reveals that the representative morphology feature of the screw dislocation growth is the stepwise spiral terrace configuration and the growth kinetics of the as-synthesized microrods follows the prediction of the dislocation growth mechanism as described by Burton-Cabrera-Frank theory. This work provides not only a new method for synthesizing Al2 O3 microrods but also a new insight into the growth mode for Al2 O3 microrods. Highlights: Single crystal α-Al2 O3 microrods were synthesized via a simple CVD approach. The presence of screw dislocations in the microrods was confirmed by SEM analysis. The growth kinetics of the microrods followed the screw dislocation growth theory.