The equation of state of the Pmmn phase of NiSi

Oliver T. Lord; Andrew R. Thomson; Elizabeth T H Wann; Ian G. Wood; David P. Dobson; Lidunka Vocadlo

doi:10.1107/S1600576715020087

The equation of state of the Pmmn phase of NiSi

Oliver T. Lord^*, Andrew R. Thomson, Elizabeth T H Wann, Ian G. Wood, David P. Dobson, Lidunka Vocadlo

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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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).

Original language	English
Pages (from-to)	1914-1920
Number of pages	7
Journal	Journal of Applied Crystallography
Volume	48
Issue number	6
DOIs	https://doi.org/10.1107/S1600576715020087
Publication status	Published - 1 Dec 2015

Bibliographical note

Date of Acceptance: 23/10/2015

Keywords

diamond anvil cells
equations of state
high pressure
NiSi

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10.1107/S1600576715020087Licence: CC BY

Lord_et_al_J_App_Cryst_2015Final published version, 738 KBLicence: CC BY

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Diffusion in the DAC: Probing the physical state of the Earth's inner core
Lord, O. T.
30/09/13 → 30/09/16
Project: Research

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title = "The equation of state of the Pmmn phase of NiSi",

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) {\AA}3 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) {\AA}3 atom−1, K0 = 171 (4) GPa and K0′ = 5.5 (3).",

keywords = "diamond anvil cells, equations of state, high pressure, NiSi",

author = "Lord, {Oliver T.} and Thomson, {Andrew R.} and Wann, {Elizabeth T H} and Wood, {Ian G.} and Dobson, {David P.} and Lidunka Vocadlo",

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AU - Lord, Oliver T.

AU - Thomson, Andrew R.

AU - Wann, Elizabeth T H

AU - Wood, Ian G.

AU - Dobson, David P.

AU - Vocadlo, Lidunka

N1 - Date of Acceptance: 23/10/2015

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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).

AB - 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).

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The equation of state of the Pmmn phase of NiSi

Abstract

Bibliographical note

Keywords

Access to Document

Diffusion in the DAC: Probing the physical state of the Earth's inner core

Cite this