Zinc-blende to rocksalt transition in SiC in a laser-heated diamond-anvil cell

Kierstin Daviau and Kanani K. M. Lee
Phys. Rev. B 95, 134108 – Published 18 April 2017
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Abstract

We explore the stability of the ambient pressure zinc-blende polymorph (B3) structure of silicon carbide (SiC) at high pressures and temperatures where it transforms to the rocksalt (B1) structure. We find that the transition occurs ∼40 GPa lower than previously measured when heated to moderately high temperatures. A lower transition pressure is consistent with the transition pressures predicted in numerous ab initio computations. We find a large volume decrease across the transition of ∼17%, with the volume drop increasing at higher formation pressures, suggesting this transition is volume driven yielding a nearly pressure-independent Clapeyron slope. Such a dramatic density increase occurring at pressure is important to consider in applications where SiC is exposed to extreme conditions, such as in industrial applications or planetary interiors.

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  • Received 17 October 2016
  • Revised 24 February 2017
  • Corrected 17 November 2017

DOI:https://doi.org/10.1103/PhysRevB.95.134108

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Corrections

17 November 2017

Erratum

Authors & Affiliations

Kierstin Daviau* and Kanani K. M. Lee

  • Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA

  • *Corresponding author: kierstin.daviau@yale.edu

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Issue

Vol. 95, Iss. 13 — 1 April 2017

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