14,303 Works

1810678

Dr Aidy Hillier, Professor Bill David & Dr Josh Makepeace

Lead hydrogen phosphate

CNRS Paris F. Fillaux
Inelastic Neutron Scattering spectrum of Lead hydrogen phosphate, PbHPO₄, measured on the TFXA instrument.

Unraveling Local Structure in Pseudocubic Perovskite Solid Solutions

Dr Igor Levin, Dr Ian Reaney & Dr Helen Playford
Recently, several perovskite-like ceramic-oxide solid solutions featuring pseudocubic symmetry have been reported to exhibit technologically promising dielectric and electromechanical properties. The goal of the proposed neutron total-scattering experiments is to gain understanding of the local structure in such pseudocubic materials and then use this knowledge to establish crystal-chemical principles for the design of new perovskite formulations with desired properties.

1669000

Dr Ad Van Well, Dr Robert Dalgliesh, Dr Sven Erik Offerman, Miss Chrysoula Ioannidou & Dr Zaloa Arechabaleta Guenechea

1320034

Professor Adrian Rennie, Professor Martin Malmsten & Mrs Shalini Singh

Paramagnons in the chiral superconductor Sr2RuO4

Professor Stephen Hayden, Dr Russell Ewings, Mr Richard Waite & Dr David Voneshen
Sr2RuO4 is a 2-D layered perovskite oxide metal which becomes superconducting below 1.5K. There is strong experimental evidence that the superconducting wavefunction is unconventional with a triplet spin part and orbital part with belongs to a two-dimensional representation. It is likely that the order parameter is chiral. It is widely believed that the Cooper pairing is mediated by ferromagnetic spin fluctuations. Thus Sr2RuO4 would be an electronic analogue of superfluid He-3 which is also believed...

1400031

Dr Luke Clifton, Dr Stephen Holt, Dr Arwel Hughes, Professor Jeremy Lakey & Mr Tim Robson

Total scattering from polymer solution as a basis for molecular modelling development.

Dr Alison Paul, Dr Craig James, Dr Tom Headen & Mr Nimai Mehta
Using computers to design molecules is a methodology widely adopted in drug discovery to identify targets for synthesis. As molecules increase in size, more computing power is needed to work out the structure, limiting the modelling of large flexible molecules like proteins and polymers, and especially these molecules in solution. Progress has been made modelling proteins starting from known structure in the crystalline state, but for polymers (highly flexible, non-crystallising), the challenge is very much...

Nanoscale Segregation and Order-Disorder in Ceria-Zirconia Catalysts

Professor Richard Walton, Mrs Lucy McLeod, Mr James Annis, Dr Helen Playford & Mr Aron Summer
This proposal is concerned with understanding the properties of materials used in important applications in catalysis and energy, such as in molecular transformations of exhaust gases for environmental remediation. We will study the local atomic structure of a set of mixed cerium-zirconium oxides to examine the issue of phase separation on the nanoscale. We need to understand why materials with the same chemical composition can have very different properties, thus by measuring the distribution of...

Total scattering structures of non-graphitisable carbons for applications in sodium-ion batteries

Professor Martin Dove, Miss Hande Alptekin, Miss Hui Luo, Dr Tom Headen, Professor Magdalena Titirici, Dr Anthony Phillips & Mr Guanqun Cai
Due to the high global abundance of sodium, Na-ion batteries are an attractive option to Li-ion batteries for low-cost energy-storage technologies. Graphite, the anode choice in Li-ion batteries, cannot intercalate Na electrochemically. On the other hand, non-graphitisable carbons have shown good reversible capacities and life cycle when used as negative anodes in Na-ion batteries. In order to elucidate the structural features of carbon anodes for Na-ion batteries, we propose to perform neutron total scattering studies...

Cobalt phase analysis and internal strain under thermomechanical loading: allotropic transformation study

Dr Pierre-Antoine Dubos, Dr Jamal Fajoui, Mrs Marie-Jose Moya Hernandez, Dr Joe Kelleher & Mr Nadjib ISKOUNEN
The present proposal leans on the study of the elastoviscoplastic behavior of a polycrystalline Co by neutron diffraction (ENGIN-X) in line with theoretical investigations : 4 dogbone-shaped samples will be charged in situ under incremental tensile strain at 4 different temperatures (ambient, 400, 450 and 500°C). To obtain a consequent data set for strain analyses, {hk.l} diffraction peaks will be followed along 2 principal directions. Collected patterns will provide the necessary data to establish a...

Cobalt phase analysis and internal strain under thermomechanical loading: allotropic transformation study

Dr Pierre-Antoine Dubos, Dr Jamal Fajoui, Mrs Marie-Jose Moya Hernandez, Dr Joe Kelleher & Mr Nadjib ISKOUNEN
The present proposal leans on the study of the elastoviscoplastic behavior of a polycrystalline Co by neutron diffraction (ENGIN-X) in line with theoretical investigations : 4 dogbone-shaped samples will be charged in situ under incremental tensile strain at 4 different temperatures (ambient, 400, 450 and 500°C). To obtain a consequent data set for strain analyses, {hk.l} diffraction peaks will be followed along 2 principal directions. Collected patterns will provide the necessary data to establish a...

Correlating local structure with properties in piezoelectrics, and multiferroics.

Dr Matthew Rosseinsky, Dr John Claridge, Dr Helen Playford, Dr Jonathan Alaria, Dr Thomas Whittle, Professor Andrew Bell, Dr Todd Wesley Surta & Dr Philippa Shepley
Discovery and development of advanced materials requires understanding and control of the relationship between composition, structure and function. Traditionally, design has relied upon the average structure of the unit cell as determined by Bragg diffraction, but it has become apparent that deviations from this long-range average view of the structure, at length scales both larger and smaller than the unit cell, can have decisive effects. Here, as a key part of a new Leeds-Liverpool EPSRC...

Correlating local structure with properties in piezoelectrics, and multiferroics.

Dr Matthew Rosseinsky, Dr John Claridge, Dr Helen Playford, Dr Jonathan Alaria, Dr Thomas Whittle, Professor Andrew Bell, Dr Todd Wesley Surta & Dr Philippa Shepley
Discovery and development of advanced materials requires understanding and control of the relationship between composition, structure and function. Traditionally, design has relied upon the average structure of the unit cell as determined by Bragg diffraction, but it has become apparent that deviations from this long-range average view of the structure, at length scales both larger and smaller than the unit cell, can have decisive effects. Here, as a key part of a new Leeds-Liverpool EPSRC...

In-situ study of the deformation mechanisms involved during high temperature tensile tests of an (alpha+beta) titanium alloy.

Dr Vanessa Vidal, Dr Tung Lik Lee & Ms Laurie DESPAX
The present work proposes to investigate the mechanisms of the hot and the superplastic (SP) deformation behaviour for a two-phase Titanium alloy (Ti-6Al-4V) that presents an allotropic transformation between alpha (HCP) and beta (BCC) phases. In situ time of flight (TOF) neutron diffraction experiments performed during thermo-mechanical loadings under an argon atmosphere could allow to study the dynamic microstructural evolutions (phase fraction, lattice strain in each phase versus the stress, correlation with changes in chemical...

In-situ study of the deformation mechanisms involved during high temperature tensile tests of an (alpha+beta) titanium alloy.

Dr Vanessa Vidal, Ms Laurie DESPAX & Dr Tung Lik Lee
The present work proposes to investigate the mechanisms of the hot and the superplastic (SP) deformation behaviour for a two-phase Titanium alloy (Ti-6Al-4V) that presents an allotropic transformation between alpha (HCP) and beta (BCC) phases. In situ time of flight (TOF) neutron diffraction experiments performed during thermo-mechanical loadings under an argon atmosphere could allow to study the dynamic microstructural evolutions (phase fraction, lattice strain in each phase versus the stress, correlation with changes in chemical...

In-situ study of the deformation mechanisms involved during high temperature tensile tests of an (alpha+beta) titanium alloy.

Dr Vanessa Vidal, Ms Laurie DESPAX & Dr Tung Lik Lee
The present work proposes to investigate the mechanisms of the hot and the superplastic (SP) deformation behaviour for a two-phase Titanium alloy (Ti-6Al-4V) that presents an allotropic transformation between alpha (HCP) and beta (BCC) phases. In situ time of flight (TOF) neutron diffraction experiments performed during thermo-mechanical loadings under an argon atmosphere could allow to study the dynamic microstructural evolutions (phase fraction, lattice strain in each phase versus the stress, correlation with changes in chemical...

IN SITU CHARACTERISATION OF INTERNAL STRESSES IN A CLAD PRESSURE VESSEL STEEL DURING POST-WELD HEAT TREATMENT

Dr John Francis, Mr Alessandro Cattivelli & Dr Tung Lik Lee
Nuclear reactor pressure vessels are safety critical components of pressurised light water reactors. They enclose the nuclear fuel rods, that contain the nuclear fuel (uranium oxide). To resist corrosion and chemical attack from the water of the primary circuit of the reactor, that is the fluid that removes heat from the uranium, the pressure vessel is clad in stainless steel to protect the underlying low alloy steel, that is not corrosion resistant. The stainless steel...

IN SITU CHARACTERISATION OF INTERNAL STRESSES IN A CLAD PRESSURE VESSEL STEEL DURING POST-WELD HEAT TREATMENT

Dr John Francis, Mr Alessandro Cattivelli & Dr Tung Lik Lee
Nuclear reactor pressure vessels are safety critical components of pressurised light water reactors. They enclose the nuclear fuel rods, that contain the nuclear fuel (uranium oxide). To resist corrosion and chemical attack from the water of the primary circuit of the reactor, that is the fluid that removes heat from the uranium, the pressure vessel is clad in stainless steel to protect the underlying low alloy steel, that is not corrosion resistant. The stainless steel...

Breaking Zachariasen rules - the structure of barium zirconium fluoride glasses

Dr Gavin Mountjoy, Miss Laura Swansbury, Mr Louis Forto Chungong, Dr Richard Martin, Professor Jacqueline Johnson, Mr Maha Rai & Dr Alex Hannon
Glass is an essential material with applications that are dominated by oxides, but fluoride glasses (based on barium zirconium fluorides, "ZBLAN" glasses) have key applications for infrared transmission and rare earth luminescence. Although they have ionic bonding their structures do not follow the "Zachariasen rules" which predict small, well-defined network forming units. Instead ZBLAN glasses have Zr with large coordination numbers of 7 and 8. Given the limited previous structural studies of ZBLAN glasses it...

Investigation of lithium diffusion in spinel Li2NiGe3O8 and N-doped Li3+xV4-xNx ceramics using muon spectroscopy

Dr Nik Reeves-McLaren, Dr Peter Baker, Professor Anthony West, Mr Bo Dong, Dr Nicola Morley & Dr P Pooja Panchmatia
We wish to perform muon spectroscopic experiments on materials from two ceramic systems that are of interest for possible solid electrolyte applications in lithium-ion battery devices: (i) Li2NiGe3O8 and (ii) N-doped Li3+xVO4-xNx. Muon spectroscopy will provide us with a means of determining the key parameters of Li diffusion (Li-ion diffusion rates and activation energies) in our paramagnetic ion-containing systems. Similar data cannot be obtained using any other technique. We request 5 days of beamtime on...

1320398

Professor Fabrice Bert, Dr Andrew Wildes, Dr Paul Freeman, Professor Christian Ruegg, Professor Henrik Ronnow, Professor Des McMorrow, Professor Martin Mansson, Dr Zhuo Feng, Mr Jean-Christophe Orain, Mr Matt Mena & Ms Diane Lancon

1820042

Dr Sarah Barnett, Dr David Allan & Dr Craig Bull

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