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Screw dislocation assisted spontaneous growth of HfB2 tubes and rods

journal contribution
posted on 09.11.2015, 10:51 by Saranya Venugopal, Daniel Doni Jayaseelan, Anish Paul, Vaidhy Vaidhyanathan, J.G.P. Binner, Peter M. Brown
The mechanism of anisotropic growth of HfB2 rods has been discussed in this study. HfB2 powder has been synthesized via a sol–gel-based route using phenolic resin, hafnium chloride, and boric acid as the source of carbon, hafnium, and boron respectively, though a small number of comparative experiments involved amorphous boron as the boron source. The effects of calcination dwell time and Hf:C and Hf:B molar ratio on the purity and morphology of the final powder have been studied and the mechanism of anisotropic growth of HfB2 has been investigated. It is hypothesized that imperfect oriented attachment of finer HfB2 particles results in screw dislocations in the coarser particles. The screw dislocation facilitates dislocation-driven growth of particles into anisotropic HfB2 rods.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

JOURNAL OF THE AMERICAN CERAMIC SOCIETY

Volume

98

Issue

7

Pages

2060 - 2064 (5)

Citation

VENUGOPAL, S. ...et al., 2015. Screw Dislocation Assisted Spontaneous Growth of HfB2 Tubes and Rods. Journal of the American Ceramic Society, 98(7), pp. 2060-2064.

Publisher

© The American Ceramic Society. Published by Wiley.

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This paper is in closed access.

ISSN

0002-7820

Language

en

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