Attainment of near-hydrostatic compression conditions using the Paris–Edinburgh cell

Marshall, William G.; Francis, D. J.

doi:10.1107/s0021889801018350

Cited by 162 publications

(139 citation statements)

References 18 publications

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“…25,26 In addition to the powder under study, a small Pb sphere (ca. 0.8 mm diameter) was included in the standard null-scattering TiZr gasket 27 for use as a pressure marker, along with a few drops of a 4:1 by volume mixture of perdeuterated methanol/ethanol pressure transmitting medium. 28 Using the conventional collection mode of Pearl, data were collected using high resolution banks centred at 90 , corresponding to a d-spacing range of 0.3 to 4.15 Å .…”

Section: Methodsmentioning

confidence: 99%

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

Comyn

Stevenson

Al-Jawad

et al. 2013

Journal of Applied Physics

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Pressure induced para-antiferromagnetic switching in BiFeO 3 -PbTiO 3 as determined using in-situ neutron diffraction BiFeO 3 -PbTiO 3 exhibits both ferroelectric and antiferromagnetic order, depending on the composition. Moderate hydrostatic pressures have been used at room temperature to transform the crystallographic phase from P4mm to R3c for the compositions 0.7BiFeO 3 -0.3PbTiO 3 and 0.65BiFeO 3 -0.35PbTiO 3 ,a sd e t e r m i n e du s i n gin-situ neutron diffraction. Using Rietveld refinements, the resultant data showed that, for both compositions, a transformation from para-to G-type antiferromagnetic order accompanied the structural transition. The transformation occurred over the range 0.4-0.77 and 0.67-0.88 GPa for 0.7BiFeO 3 -0.3PbTiO 3 and 0.65BiFeO 3 -0.35PbTiO 3 , respectively; at intermediate pressures, a mixture of P4mm and R3c phases were evident. These pressures are far lower than required to induce a phase transition in either the BiFeO 3 or PbTiO 3 end members. The driving force for this pressure induced first order phase transition is a significant difference in volume between the two phases, P4mm > R3c of 4%-5%, at ambient pressure. Upon removal of the pressure, 0.65BiFeO 3 -0.35PbTiO 3 returned to the paramagnetic tetragonal state, whereas in 0.7BiFeO 3 -0.3PbTiO 3 antiferromagnetic ordering persisted, and the structural phase remained rhombohedral. Using conventional laboratory x-ray diffraction with a hot-stage, the phase readily reverted back to a tetragonal phase, at temperatures between 100 and 310 Cf o r 0.7BiFeO 3 -0.3PbTiO 3 , far lower than the ferroelectric Curie point for this composition of 632 C. To our knowledge, the reported pressure induced para-to antiferromagnetic transition is unique in the literature. V C 2013 AIP Publishing LLC.[http://dx

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Section: Methodsmentioning

confidence: 99%

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

Comyn

Stevenson

Al-Jawad

et al. 2013

Journal of Applied Physics

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“…18,19 In this particular cell design, the nonhydrostaticity of the pressure medium also served to reduce stress on the anvils; in its original configuration maximum pressures of only 2-3 GPa could be achieved with hydrostatic pressure media compared to 9-10 GPa with fluorinert. 10 Recent experiments suggest that fluorinert is hydrostatic to 0.6 GPa, 20,21 but evidence for a low hydrostatic limit of fluorinert goes back at least to the work of Decker et al 22 They showed that use of fluorinert completely suppresses the monoclinic-to-rhombohedral phase transition in lead phosphate that normally occurs at 1.8 GPa and had therefore transmitted shear stresses to the lead phosphate sample that stabilized the monoclinic ferroelastic phase. More recently, line broadening in high-pressure neutron powder diffraction experiments has been attributed to the nonhydrostaticity of fluorinert, but estimates of the pressure range at which broadening starts range between 0.7 and 5 GPa.…”

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confidence: 99%

“…[5][6][7][8][9] Although the degree of line broadening depends sensitively upon a number of factors, including the physical state and the elastic constant tensor of the sample, this limitation of the cell/medium invariably degrades the quality of the resulting diffraction pattern by means of a loss of effective instrumental resolution. 10 The practice of neglecting the nonhydrostatic compression effect and taking the lattice parameter as the average of the lattice parameters calculated from the measured d spacings of the observed reflections results in an overestimation of the lattice parameter and the standard deviation in the lattice parameter. 4 Furthermore, the apparent pressure registered by internal pressure standards can also be affected by nonhydrostatic stresses, 2,3,11-14 resulting in incorrect equation of state parameters being determined from pressure-volume data.…”

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Fluorinert as a pressure-transmitting medium for high-pressure diffraction studies

Varga¹,

Wilkinson²,

Angel³

2003

Review of Scientific Instruments

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Fluorinert is a liquid pressure-transmitting medium that is widely used in high-pressure diffraction work. A systematic study of five different fluorinerts was carried out using single-crystal x-ray diffraction in a diamond-anvil cell in order to determine the pressure range over which they provide a hydrostatic stress state to the sample. It was found that none of the fluorinerts studied can be considered hydrostatic above 1.2 GPa, a lower pressure than reported previously.

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“…Pour les mesures de neutrons, on choisira de préfèrence un liquide non hydrogéné tel que les hydrocarbures perfluorés de la série des Fluorinert (FC-75, mélange FC-84-FC-87 hydrostatique jusque vers 2,3 GPa à l'ambiante [36,41]), ou des mélanges d'alcools deutériés (éthanol-méthanol ou pentane-isopentane) restant liquides jusqu'à des pressions supérieures [26].…”

Section: Les Chambres De Type Piston-cylindre à Milieu Transmetteur Lunclassified

Diffusion neutronique sous conditions extrêmes

Mignot

2008

Études Structurales Par Diffraction Des Neutrons

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Résumé. Depuis quelques années, on assiste dans tous les centres de neutrons à un regain d'intérêt pour les expériences réalisées sous "conditions extrêmes". En partant des techniques classiques de basses températures, forts champs et hautes pressions adaptées à la diffusion neutronique, ce cours passe en revue les développements en cours ou à venir, depuis les échantillons microscopiques étudiés dans les cellules à enclumes en diamant jusqu'aux puissantes installations devant produire des champs magnétiques bien supérieurs à la limite actuelle des 15 teslas.

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Attainment of near-hydrostatic compression conditions using the Paris–Edinburgh cell

Cited by 162 publications

References 18 publications

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

Pressure induced para-antiferromagnetic switching in BiFeO3–PbTiO3 as determined using in-situ neutron diffraction

Fluorinert as a pressure-transmitting medium for high-pressure diffraction studies

Diffusion neutronique sous conditions extrêmes

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