Growth mechanism of crystalline SiAlON microtubes prepared by combustion synthesis

Guanghua Liu; Kexin Chen; Jiangtao Li

doi:10.1039/C2CE25525A

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CrystEngComm

Issue 17, 2012

Design and understanding of solid-state and crystalline materials

Impact Factor 3.842 48 Issues per Year

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Paper

Growth mechanism of crystalline SiAlON microtubes prepared by combustion synthesis

Guanghua Liu,*^a Kexin Chen^b and Jiangtao Li^a

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Corresponding authors

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, China

Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, China
E-mail: liugh02@mails.tsinghua.edu.cn ;
Fax: +86-10-82543695

CrystEngComm, 2012,14, 5585-5588

DOI: 10.1039/C2CE25525A
Received 09 Apr 2012, Accepted 30 May 2012
First published online 31 May 2012

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Abstract
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Crystalline SiAlON microtubes have been prepared by combustion synthesis, and the growth mechanism of the microtubes is discussed. Two mechanisms are proposed for the formation of the SiAlON microtubes, viz. accumulation of tip concave effect of rod-like crystals and side-by-side coalescence of rod-like crystals. The growth of SiAlON microtubes can be favored by the special reaction condition in combustion synthesis, which is characterized by high reaction temperatures (>1900 °C), drastic heating rates ( [similar] 10³ °C s⁻¹), and a high N₂ pressure of 6 MPa. The microtube is a new crystal shape of SiAlON, and an investigation on its formation mechanism increases the knowledge on crystal growth of SiAlON materials.