Note: Achieving quasi-hydrostatic conditions in large-volume toroidal anvils for neutron scattering to pressures of up to 18 GPa

Bull, Craig L.; Bocian, Artur; Hamidov, Hayrullo; Kamenev, Konstantin V.; Nelmes, R. J.; Loveday, J. S.

doi:10.1063/1.3606643

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…Despite the relatively low intensity of neutron sources, the design and development of the Paris-Edinburgh (P-E) pressure cell has enabled powder neutron diffraction to routinely reach pressures of $10 GPa (Besson et al, 1992), and, through the use of more specialized equipment, pressures as high as $30 GPa can be achieved (Klotz et al, 1995). At present, single-crystal neutron diffraction using the P-E press is limited to 16 GPa (Bull, Bocian et al, 2011;Bull, Guthrie et al, 2011). Techniques for powder and single-crystal neutron diffraction at higher pressures than those currently accessible using a P-E press are still undergoing rapid development (Klotz, 2012;Binns et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Neutron total scattering of crystalline materials in the gigapascal regime

2017

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Neutron total scattering of disordered crystalline materials provides direct experimental access to the local (short-range) structure. The ways in which this local structure agrees (or disagrees) with the long-range crystal structure can provide important insight into structure-property relationships. High-pressure neutron diffraction using a Paris-Edinburgh (P-E) pressure cell allows experimenters to explore the ways in which materials are affected by pressure, can reveal new synthetic routes to novel functional materials and has important applications in many areas, including geology, engineering and planetary science. However, the combination of these two experimental techniques poses unique challenges for both data collection and analysis. In this paper it is shown that, with only minor modifications to the standard P-E press setup, high-quality total scattering data can be obtained from crystalline materials in the gigapascal pressure regime on the PEARL diffractometer at ISIS. The quality of the data is assessed through the calculation of coordination numbers and the use of reverse Monte Carlo refinements. The time required to collect data of sufficient quality for detailed analysis is assessed and is found to be of the order of 8 h for a quartz sample. Finally, data from the perovskite LaCo 0.35 Mn 0.65 O 3 are presented and reveal that PEARL total scattering data offer the potential of extracting local structural information from complex materials at high pressure.

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Section: Introductionmentioning

confidence: 99%

Neutron total scattering of crystalline materials in the gigapascal regime

2017

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“…Details on both procedures are available elsewhere. [19][20][21] More recently a new gas loader designed by Klotz et al in which gases (including deuterium) are loaded into a clamp at 2 kbar gas pressure prior to insertion into the VX3 PE press, has become part of the user programme. [22]…”

Section: Gaskets and Hydrostatic Mediamentioning

confidence: 99%

PEARL: the high pressure neutron powder diffractometer at ISIS

Bull

Funnell

Tucker

et al. 2016

High Pressure Research

107

113

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The PEARL instrument at ISIS has been designed for, and dedicated to, in-situ studies of materials at high pressure, using the Paris-Edinburgh press. In recent years, upgrades to the instrument have led to improvements in data quality and the range of achievable pressures and temperatures; currently 0.5-28 GPa and 80-1400 K. This paper describes the technical characteristics of the instrument, its current capabilities, and gives a brief overview of the science that has been performed, using representative examples.

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“…We have recently developed the ability to load argon gas at high pressure into the PE press at room temperature to act as a pressure medium, and we have been able to measure singlecrystal reflections of sodium chloride and squaric acid up to pressures of 16 GPa under quasi-hydrostatic conditions with no measurable peak broadening (Bocian et al, 2010;Bull, Bocian et al, 2011). This development will increase further the scope of science that it is possible to perform on the D9 instrument.…”

Section: Further Developmentsmentioning

confidence: 99%

High-pressure single-crystal neutron diffraction to 10 GPa by angle-dispersive techniques

Bull¹,

Guthrie

Archer

et al. 2011

J Appl Cryst

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Techniques have been developed that allow the measurement of accurate single‐crystal neutron‐diffraction data at pressures up to 10 GPa, using angle‐dispersive methods. High‐quality data have been collected up to 10 GPa, to a resolution of sinθ/λ≃ 1.5 Å−1, from samples of size 3–4 mm. This article presents the methods developed to mount and centre the sample accurately on the instrument; to reduce the background and hence increase the precision of the measured reflection intensities; and to increase further the accessible region of reciprocal space with a single sample loading. Developments are also highlighted, with a view to increasing the range of both science and pressures that can be achieved at the Institut Laue–Langevin reactor source using single‐crystal techniques.

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Note: Achieving quasi-hydrostatic conditions in large-volume toroidal anvils for neutron scattering to pressures of up to 18 GPa

Cited by 7 publications

References 13 publications

Neutron total scattering of crystalline materials in the gigapascal regime

Neutron total scattering of crystalline materials in the gigapascal regime

PEARL: the high pressure neutron powder diffractometer at ISIS

High-pressure single-crystal neutron diffraction to 10 GPa by angle-dispersive techniques

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