GEM — General materials diffractometer at ISIS

Williams, W.G.; Ibberson, R. M.; Day, Peter; Enderby, J. E.

doi:10.1016/s0921-4526(97)00561-9

Cited by 103 publications

(78 citation statements)

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“…The 7 Li 7 P 3 S 11 glass ceramics was put into a stainless seal cell with capton windows in argon gas, and a SXPD pattern was collected at RT for 2 h. We also measured a time-of-flight NPD (TOF-NPD) pattern at RT for 5 h on the General Material Diffractometer (GEM), 5,6) installed at the ISIS in the UK Rutherford Appleton Laboratory. The 7 Li 7 P 3 S 11 was put into a cylindrical vanadium can of 8 mm diameter in argon gas.…”

Section: )mentioning

confidence: 99%

Crystal Structure of Li₇P₃S₁₁Studied by Neutron and Synchrotron X-ray Powder Diffraction

et al. 2010

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Time-of-flight neutron powder diffraction (TOF-NPD) and synchrotron X-ray powder diffraction (SXPD) experiments were carried out to study the crystal structure of 7 Li isotope enriched 7 Li 7 P 3 S 11 glass ceramics, which is a lithium superionic conductor. Combined X-ray/neutron Rietveld refinement informed us precise atomic coordinates, especially lithium. Furthermore, a network of neighboring Li + cations was visualized in the crystal structure of Li 7 P 3 S 11 with the triclinic system (space group: 1 P ) in order to predict the diffusion pathway of Li + cations.

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Section: )mentioning

confidence: 99%

Crystal Structure of Li₇P₃S₁₁Studied by Neutron and Synchrotron X-ray Powder Diffraction

et al. 2010

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“…Time-Of-Flight (TOF) neutron diffraction patterns were recorded on the high intensity, high resolution diffractometer GEM at the pulsed neutron source ISIS facility, Rutherford Appleton Laboratory, UK 25 . Due to the possibility of decomposition of the phase over a few days, a 5 g sample was stored under N2 in a sealed tube prior to measurement.…”

Section: Methodsmentioning

confidence: 99%

The Crystal Structure of Ba₃Nb₂O₈ Revisited: A Neutron Diffraction and Solid-State NMR Study

et al. 2017

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ABSTRACT:The structure of Ba3Nb2O8 has been investigated using high resolution neutron powder diffraction. Our results show that whilst the structure has some features in common with the 9R perovskite and palmierite structures, it is a new and distinct structure. It is shown to follow a (chh)(hhc)(chh) sequence with BaO3- packing layers and is a cation and aniondeficient 9H perovskite polytype. Nb atoms occupy octahedral sites with vacancies between hexagonal close-packed layers. Isolated, corner-sharing and face-sharing Nb-O octahedra all occur within the unit cell. The identification of purely octahedral Nb is supported by solid state 93 Nb wideline NMR measurements. A two-component line shape was detected: a narrow featureless resonance with an isotropic chemical shift of δiso -928 ± 5 ppm consistent with regular Nb octahedra, and a much broader featureless resonance with an approximate isotropic chemical shift in the range δiso ~-944 --937 ± 10 ppm consistent with Nb octahedra influenced by O vacancies. These are both characteristic of six-fold oxo-coordinated Nb environments. The highly distorted octahedral environments in Ba3Nb2O8 make it a potential candidate for dielectric and photocatalytic applications.

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“…We chose to investigate such an instrument with a wavelength resolution of δλ/λ = 0.1 % and almost 4π detector coverage comparable to GEM at ISIS. 11) To obtain this high resolution a diffractometer needs to be adequately long or use a short pulse; e.g. a diffractometer using neutrons with wavelengths around 1.5 Å, 0.1 % wavelength resolution, a pulse length of 2 ms, and filling the whole time frame, will need to be more than 5 kilometres long!…”

Section: Thermal Powder Diffractometermentioning

confidence: 99%

“…It can be seen that a significant gain in intensity at the sample can be achieved by relaxing the resolution. Comparing to the GEM 11,12) instrument at ISIS that for a resolution of δd/d of ∼ 4 · 10 −3 at 115…”

Section: Sb018-mentioning

confidence: 99%

Powder Diffractometers at Long-Pulsed Sources

et al. 2011

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We have investigated the performance of a cold and a thermal neutron powder diffractometer installed at at longpulsed source with the use of Monte Carlo ray tracing simulations. We show that the cold powder diffractometer will be a very powerful instrument when a relaxed resolution can be accepted -e.g. for magnetic studies. A comparison between a thermal powder diffractometer with and without Wavelength Frame Multiplication (WFM) show that the WFM technique can be used to achieve shorter instrument length without losing flux. The thermal powder diffractometer will be competitive with the existing high resolution powder diffractometers.

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GEM — General materials diffractometer at ISIS

Cited by 103 publications

References 1 publication

Crystal Structure of Li₇P₃S₁₁Studied by Neutron and Synchrotron X-ray Powder Diffraction

Crystal Structure of Li₇P₃S₁₁Studied by Neutron and Synchrotron X-ray Powder Diffraction

The Crystal Structure of Ba₃Nb₂O₈ Revisited: A Neutron Diffraction and Solid-State NMR Study

Powder Diffractometers at Long-Pulsed Sources

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GEM — General materials diffractometer at ISIS

Cited by 103 publications

References 1 publication

Crystal Structure of Li7P3S11Studied by Neutron and Synchrotron X-ray Powder Diffraction

Crystal Structure of Li7P3S11Studied by Neutron and Synchrotron X-ray Powder Diffraction

The Crystal Structure of Ba3Nb2O8 Revisited: A Neutron Diffraction and Solid-State NMR Study

Powder Diffractometers at Long-Pulsed Sources

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Product

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Crystal Structure of Li₇P₃S₁₁Studied by Neutron and Synchrotron X-ray Powder Diffraction

Crystal Structure of Li₇P₃S₁₁Studied by Neutron and Synchrotron X-ray Powder Diffraction

The Crystal Structure of Ba₃Nb₂O₈ Revisited: A Neutron Diffraction and Solid-State NMR Study