High-pressure synthesis and study of low-compressibility molybdenum nitride (MoN and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">MoN</mi></mrow><mrow><mn>1</mn><mi>−</mi><mi>x</mi></mrow></msub></mrow><mo>)</mo></math></span> phases

Emmanuel Soignard; Paul F. McMillan; Tracey D. Chaplin; Sharif M. Farag; Craig L. Bull; Maddury S. Somayazulu; Kurt Leinenweber

doi:10.1103/PhysRevB.68.132101

High-pressure synthesis and study of low-compressibility molybdenum nitride (MoN and ${MoN}_{1 - x})$ phases

Emmanuel Soignard, Paul F. McMillan, Tracey D. Chaplin, Sharif M. Farag, Craig L. Bull, Maddury S. Somayazulu, and Kurt Leinenweber

Phys. Rev. B 68, 132101 – Published 8 October 2003

Abstract

We report the compressibility of the stoichiometric hexagonal δ phase of MoN that is a well-known hard material that becomes superconducting below $T_{c} = 12 K .$ The measured bulk modulus is $K_{0} = 345 (9) GPa$ and $K_{0}^{'} = 3.5 (3) .$ We also report the compressibility of the non-stoichiometric cubic $B 1$ structured $γ - {Mo}_{2} N$ phase, that has a lower bulk modulus $[K_{0} = 301 (7) GPa,$ assuming $K_{0}^{'} = 4] .$ The difference in bulk modulus is due to the difference in structure and the cohesive energy between the two phases.

Received 18 June 2003

DOI:https://doi.org/10.1103/PhysRevB.68.132101

Authors & Affiliations

Emmanuel Soignard¹, Paul F. McMillan^1,2,*, Tracey D. Chaplin¹, Sharif M. Farag¹, Craig L. Bull^1,2, Maddury S. Somayazulu³, and Kurt Leinenweber⁴

¹Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
²Davy-Faraday Research Laboratory, Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, United Kingdom
³HPCAT, Advanced Photon Source, Argonne National Laboratories, Argonne, Illinois, USA
⁴Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA

^*Author to whom correspondence should be addressed. Email address: p.f.mcmillan@ucl.ac.uk

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Vol. 68, Iss. 13 — 1 October 2003

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Physical Review B

covering condensed matter and materials physics