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The equation of state of the Pmmn phase of NiSi

Lord, OT; Thomson, AR; Wann, ETH; Wood, IG; Dobson, DP; Vocadlo, L; (2015) The equation of state of the Pmmn phase of NiSi. Journal of Applied Crystallography , 48 pp. 1914-1920. 10.1107/S1600576715020087. Green open access

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Abstract

The equation of state of the orthorhombic phase of NiSi with Pmmn symmetry has been determined at room temperature from synchrotron-based X-ray diffraction measurements of its lattice parameters, made in a diamond anvil cell. Measurements were performed up to 44 GPa, using Ne as the pressure medium and Au as the pressure standard. The resulting pressure–volume (P–V) data have been fitted with a Birch–Murnaghan equation of state of third order to yield V0 = 11.650 (7) Å3 atom−1, K0 = 162 (3) GPa and K0′ = 4.6 (2). In addition, P–V data have been collected on Ni53Si47 in the B20 structure using both Ne and He as the pressure media and Cu and Au as the pressure standards, also to 44 GPa. A fit using the same Birch–Murnaghan equation of state of third order yields V0 = 11.364 (6) Å3 atom−1, K0 = 171 (4) GPa and K0′ = 5.5 (3).

Type: Article
Title: The equation of state of the Pmmn phase of NiSi
Open access status: An open access version is available from UCL Discovery
DOI: 10.1107/S1600576715020087
Publisher version: http://dx.doi.org/10.1107/S1600576715020087
Language: English
Additional information: This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Keywords: NiSi, equations of state, high pressure, diamond anvil cells
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1475178
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