Results on disordered materials from the GEneral Materials diffractometer, GEM, at ISIS

Hannon, Alex C.

doi:10.1016/j.nima.2005.07.053

Cited by 250 publications

(182 citation statements)

References 55 publications

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“…The neutron diffraction experiments were performed at room temperature (≃25°C) using the GEM (Hannon, 2005) and SAN-DALS (Soper, 1991) diffractometers at the ISIS pulsed neutron source. Diffraction patterns were measured for each sample in a vanadium container, the empty container, the empty instrument, and a vanadium rod of diameter 8.37(1) mm for normalization purposes.…”

Section: Neutron Diffraction Experimentsmentioning

confidence: 99%

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

et al. 2017

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The topological ordering of the network structure in vitreous Ge x Se 1−x was investigated across most of the glass-forming region (0 ≤ x ≤ 0.4) by using high-resolution neutron diffraction to measure the Bhatia-Thornton number-number partial structure factor. This approach gives access to the composition dependence of the mean coordination number n and correlation lengths associated with the network ordering. The thermal properties of the samples were also measured by using temperature-modulated differential scanning calorimetry. The results do not point to a structural origin of the so-called intermediate phase, which in our work is indicated for the composition range 0.175(8) ≤ x ≤ 0.235(8) by a vanishingly small non-reversing enthalpy near the glass transition. The midpoint of this range coincides with the mean-field expectation of a floppy-to-rigid transition at x = 0.20. The composition dependence of the liquid viscosity, as taken from the literature, was also investigated to look for a dynamical origin of the intermediate phase, using the Mauro-YueEllison-Gupta-Allan (MYEGA) model to estimate the viscosity at the liquidus temperature. The evidence points to a maximum in the viscosity at the liquidus temperature, and a minimum in the fragility index, for the range 0.20 ≤ x ≤ 0.22. The utility of the intermediate phase as a predictor of the material properties in network glass-forming systems is discussed.

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Section: Neutron Diffraction Experimentsmentioning

confidence: 99%

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

et al. 2017

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“…The design and further technical details of the GEM detector arrays have been described by Hannon. [21] Rietveld refinements were carried out using the TOPAS Academic software [22]. Neutron total scattering data were normalised onto an absolute scale using Gudrun [23].…”

Section: Characterisationmentioning

confidence: 99%

From fluorite to pyrochlore: Characterisation of local and average structure of neodymium zirconate, Nd2Zr2O7

Payne

Tucker

Evans

2013

Journal of Solid State Chemistry

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NOTICE: this is the author's version of a work that was accepted for publication in Journal of solid state chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Journal of solid state chemistry, 255, 2013, 10.1016/j.jssc.2013.07.001 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe structural characterisation of Nd 2 Zr 2 O 7 prepared via a precursor route was performed using a combination of local and average structure probes (neutron total scattering, X-ray and neutron diffraction). We present the first total scattering and reverse Monte Carlo (RMC) modelling study of Nd 2 Zr 2 O 7 , which provides compelling evidence for the adoption of a disordered fluorite-type structure by Nd 2 Zr 2 O 7 prepared by a low-temperature precursor route.Annealing the material at high temperatures leads to a transformation to a pyrochlore-type structure; however, Rietveld refinement using powder neutron diffraction data shows that the oxygen sublattice retains a degree of disorder.

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“…At each temperature data were collected for about 5 hours. The nominal maximum Q attainable at GEM is about 100 Å -1 [7].…”

Section: Experiments and Data Reductionmentioning

confidence: 98%

“…Total scattering neutron diffraction experiments were performed at the beamline GEM at ISIS (Rutherford Appleton Laboratory, Chilton, UK) [7], with a cryofurnace, from 10 to 375 K [8], [9]. A high purity vanadium rod, extruded vanadium container, and the sample environment were also collected in order to correct and the normalize the data [10].…”

Section: Experiments and Data Reductionmentioning

confidence: 99%

Study of the negative thermal expansion of cuprite-type structures by means of temperature-dependent pair distribution function analysis: Preliminary results

Dapiaggi

Kim

Božin

et al. 2008

Journal of Physics and Chemistry of Solids

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A c c e p t e d m a n u s c r i p t

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Results on disordered materials from the GEneral Materials diffractometer, GEM, at ISIS

Cited by 250 publications

References 55 publications

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

Topological Ordering and Viscosity in the Glass-Forming Ge–Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase

From fluorite to pyrochlore: Characterisation of local and average structure of neodymium zirconate, Nd2Zr2O7

Study of the negative thermal expansion of cuprite-type structures by means of temperature-dependent pair distribution function analysis: Preliminary results

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