Journal ArticleDOI
The Polaris powder diffractometer at ISIS
TLDR
The Polaris instrument at the ISIS spallation neutron source operates as a medium resolution powder diffractometer, which enables datasets to be collected with comparatively short counting times or from extremely small sample volumes as mentioned in this paper.Abstract:
The Polaris instrument at the ISIS spallation neutron source operates as a medium resolution powder diffractometer. The high incident neutron flux enables datasets to be collected with comparatively short counting times or from extremely small sample volumes. Examples of recent experiments performed on Polaris, which exploit the high count rate and the particular advantages offered by fixed geometry diffraction measurements performed on a pulsed neutron source, are presented.read more
Citations
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Journal ArticleDOI
Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600 °C from in situ neutron diffraction
TL;DR: In this paper, the temperature dependence of the cation distribution in synthetic spinel (MgAl 2O4) was determined using in-situ time-of-flight neutron powder diffraction.
Journal ArticleDOI
Large negative linear compressibility of Ag3[Co(CN)6]
TL;DR: It is proposed that framework materials that contract along a specific direction on heating while expanding macroscopically will, in general, also expand along the same direction under hydrostatic pressure while contracting macroscopedically.
Journal ArticleDOI
High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ∼10 GPa
Stephen Hull,David A. Keen +1 more
TL;DR: The structural changes within the copper(I) halides induced by hydrostatic pressure have been investigated using the powder neutron-diffraction technique and the evolution of the structures of these I-VII compounds is very different from that observed in the more covalent II-VI and III-V systems.
Journal ArticleDOI
Hydrogen Production from Ammonia Using Sodium Amide
William I. F. David,Joshua W. Makepeace,Joshua W. Makepeace,Samantha K. Callear,Hazel M. A. Hunter,James D. Taylor,Thomas J. Wood,Martin O. Jones +7 more
TL;DR: A new type of process for the cracking of ammonia (NH3) that is an alternative to the use of rare or transition metal catalysts, and the development of NaNH2-based NH3 cracking systems may promote the utilization of NH3 for sustainable energy storage purposes.
Journal ArticleDOI
Real time observation of the hydrothermal crystallization of barium titanate using in situ neutron powder diffraction.
TL;DR: The results indicate the predominance of a homogeneous dissolution-precipitation mechanism for the hydrothermal formation of barium titanate, rather than other possible mechanisms that have been discussed in the literature.
References
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Journal ArticleDOI
Neutron powder diffraction above 10 GPa
TL;DR: In this paper, a new pressure set-up is described, which allows powder neutron diffraction measurements and full structure refinements to be performed well above 10 GPa, and examples of results are given for D2O to 8 GPa.
Journal ArticleDOI
The effect of hydrostatic pressure on the ambient temperature structure of CuO
J B Forsyth,S Hull +1 more
TL;DR: In this article, room temperature, time-of-flight, powder neutron diffraction measurements on cupric oxide, CuO, at ambient and 22(1) kbar hydrostatic pressure have provided the pressure dependence of the monoclinic lattice parameters and the single positional parameter of oxygen.
Journal ArticleDOI
Structure of LaCuO3 by powder neutron diffraction
D. B. Currie,M. T. Weller +1 more
TL;DR: Cristallisation dans P6 3 avec a=5,50195, c=13,2124 A a T=298 K and a= 5,49219, c =13,1545 A aT=5 K.