Screw Dislocation Assisted Spontaneous Growth of HfB2 Tubes and Rods

Saranya Venugopal; Daniel Doni Jayaseelan; Anish Paul; Bala Vaidhyanathan; JGP Binner; Peter M. Brown

doi:10.1111/jace.13615

Screw Dislocation Assisted Spontaneous Growth of HfB₂ Tubes and Rods

Saranya Venugopal^*, Daniel Doni Jayaseelan, Anish Paul, Bala Vaidhyanathan, JGP Binner, Peter M. Brown

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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Abstract

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.

Original language	English
Pages (from-to)	2060-2064
Number of pages	5
Journal	Journal of the American Ceramic Society
Volume	98
Issue number	7
DOIs	https://doi.org/10.1111/jace.13615
Publication status	Published - 1 Jul 2015

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1111/jace.13615

Screw dislocation growth of HfB2 tubes & rods
Accepted for publication in Journal of the American Ceramic Society.
Submitted manuscript, 4.18 MB

Cite this

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title = "Screw Dislocation Assisted Spontaneous Growth of HfB2 Tubes and Rods",

abstract = "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.",

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AU - Venugopal, Saranya

AU - Jayaseelan, Daniel Doni

AU - Paul, Anish

AU - Vaidhyanathan, Bala

AU - Binner, JGP

AU - Brown, Peter M.

PY - 2015/7/1

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N2 - 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.

AB - 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.

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