5,784 Works

1910619

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1820432

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1910030

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An attempt to measure sorption through strain induced deformation

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Zeolite catalysts are highly porous materials that take up gases and vapours into their pores. Accommodating the guest molecule inside the host framework leads to distortion within the crystal structure. We wish to see if it is possible to image the uptake of gas inside a realistic catalyst bed as a function of time and location under flow conditions.

Amorphous Micrometre-Sized Water Ice Particles for Planetary Science Experiments: Characterising the Ice Phase

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We request 2 days on SANDALS to characterise the temperature dependent properties of amorphous icy particles as they will be used in a more detailed study on NIMROD in Feburary 2020, aiming to determine the pressure-temperature ranges at which collisional studies will be most relevant to planetary science. Such a characterisation would help to narrow down the parameter space, allowing us to use the most promising conditions for the production of amorphous ice particles for...

Low-temperature magnetic correlations in SrTb2O4

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We propose to probe the development of the magnetic correlations in SrTb2O4 using WISH neutron diffractometer. In a magnetic sense, SrTb2O4 consists of triangular zig-zag ladders and is therefore affected by geometrical frustration. Our initial measurements for T>1.5 K (using CYCLOPS and D7 instruments at the ILL) revealed a disordered magnetic ground state, which we now want to examine at sub 1 K temperatures. We are particularly interested in the details of the low-temperature diffuse...

Influence of deposition strategy on microstructure heterogeneity and twinning in Wire + Arc Additive Manufactured Ti6Al4V

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Wire and Arc Additive Manufacturing (WAAM) process is rapidly moving towards the production and qualification of large structural parts. Parts built by WAAM for structural applications require to perform under cyclic loading condition without compromising the safety. The presence of heterogeneous microstructure and considerable texture leads to anisotropic mechanical properties. More importantly, the microstructure heterogeneity leads to direction dependent deformation and damage under cyclic loading. Therefore, the proposed study aims to understand the influence of...

Understanding the damage tolerance of fibre-reinforced ceramic matrix composites (FRCMCs) at ambient and elevated temperatures

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Fiber reinforced ceramic matrix composites (FRCMCs) have numerous applications, such as engine components, rocket re-entry nozzles and military vehicles due to their light weight, combined strength and toughness at high temperature. With the commercialization of GE LEAP engine using a ceramic shrouds, FRCMC is regarded as a game changer in key engineering areas for high energy efficiency and safety. FRCMCs have a complex microstructure and as damage accumulates it shows non-linear stress-strain behaviour. This is...

Structural chemistry and magnetic order of the Aurivillius material Bi2CoO2F4

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Materials with long range ferroelectric or magnetic order are important for applications including data storage, and a current key research area in functional materials is the design and preparation of materials that combine both these properties. A family of ceramic oxides, the Aurivillius family, are well known for their ferroelectric properties and until now, attempts to introduce magnetic ions into these materials have been limited. In 2018, a new Auriivillius oxide-fluoride, Bi2CoO2F4, was reported. This...

Investigating the superconducting and magnetic properties of a novel quasi-one-dimensional ternary molybdenum pnictide K2Mo3As3

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A2Mo3As3 (A = alkali metal) is a brand-new novel family of molybdenum arsenide based quasi-one-dimensional (Q1D) superconductors with a transition temperature between 10.4 to 11.5 K, discovered just a couple of months ago. The crystal structure of these materials contains special Q1D (Mo3As3)2 linear chains separated by columns of alkali metal cations. Since Mo and Cr belong to the same group of transition metals with similar electronic configuration, A2Mo3As3 superconductors, like their sister families A2Cr3As3...

Investigating the superconducting and magnetic properties of a novel quasi-one-dimensional ternary molybdenum pnictide K2Mo3As3

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A2Mo3As3 (A = alkali metal) is a brand-new novel family of molybdenum arsenide based quasi-one-dimensional (Q1D) superconductors with a transition temperature between 10.4 to 11.5 K, discovered just a couple of months ago. The crystal structure of these materials contains special Q1D (Mo3As3)2 linear chains separated by columns of alkali metal cations. Since Mo and Cr belong to the same group of transition metals with similar electronic configuration, A2Mo3As3 superconductors, like their sister families A2Cr3As3...

Hydrogen impurity in solar cell materials CIGS and CZTS

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In this proposal we intend to complete the characterization of the hydrogen impurity in solar cell materials Cu2ZnSnS4 (CZTS) and Cu(In,Ga)Se2 (CIGS), by using the positive muons as an analogue. In particular, we intend to characterize the diffusion behaviour above room temperature and look for possible trapping of muons in native defects (likely the acceptor copper vacancies, leading to its passivation). We also intend to characterize the acceptor configuration of the isolated hydrogen impurity by...

The structure of methanol in halloysite nanotubes

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Understanding the structure of liquids in nanopores and at interfaces is extremely important in many natural and industrial processes. In this experiment, we will use the unique powers of neutron scattering to measure the structure of liquid methanol in a particular type of clay mineral, known as halloysite. Halloysite is remarkable in this context, because it occurs as nano-scale tubes, which are formed from rolled-up scrolls of the clay sheets (like a swiss-roll, where a...

Oxygen Dynamics in Y2O3 doped Bi2O3: (Bi0.8Y0.2)2O3 and (Bi0.6Y0.4)2O3

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The high ionic conducting delta-phase of Bi2O3 can be stabilized at ambient temperature in a range of compositions, viz., (Bi1-xYx)2O3 (x=0.1 -0.5). We would measure inelastic (vibrational) as well as quasielastic neutron scattering (QENS) spectra for (Bi0.8Y0.2)2O3 and (Bi0.6Y0.4)2O3 from 300 K to 1100 K. The diffusion in (Bi1-xYx)2O3 starts at a low temperature of around 500 K. Our ab-inito molecular dynamics simulations show that diffusion of oxygen (at 1000 K) in (Bi0.7Y0.3)2O3 is much...

Topological superconductivity in quasi-one-dimensional superconductor Tl2Mo6Se6

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Tl2Mo6Se6 composed of quasi-one-dimensional (quasi-1D) (Mo6Se6) chains oriented along the z-axis, weakly coupled by Tl ions, giving them pseudo-one-dimensional character. Tl2Mo6Se6 is superconducting with a Tc o 3 K- 6.5 K (varies between samples) and has the greatest uniaxial anisotropy, comparable to the most anisotropic organic superconductors, albeit very simple band structures on the Fermi surface. Moreover, quasi-one-dimensional Tl2Mo6Se6 compound has also been identified as the possible candidate that can support the rare cubically dispersed...

Local structure in PMN-PT relaxor ferroelectrics

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The proposed experiments will provide neutron total-scattering data for elucidating the nanoscale ordering of polar atomic displacements that underlie the commercially viable piezoelectric properties in a classical oxide ferroelectric system. These materials find use in applications ranging from sonar transducers in naval radar systems to fuel injectors in diesel automobile engines. The currently missing detailed knowledge of atomic arrangements is required to facilitate the design of new formulations with the improved piezoelectric performance.

A depth-resolved study of magnetoelectric coupling in multiferroic PMN-PT/FeRh using PNR

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Multiferroic systems allow the modulation of magnetic properties through electric potentials. Advances in engineering atomic interfaces of heterogeneous thin-films have enabled a significant increase in magnetoelectric coupling compared with conventional single phase materials. This opens a range of interesting and exciting possibilities for new spintronic devices with applications in next-generation data storage technologies, such as antiferromagnetic memory resistors. One system with real potential is FeRh where a change in lattice parameter accompanies a change from...

Kitaev spin liquid in the Co-based honeycomb system BaCo2(P0.85V0.15)2O8

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The newly reported compound BaCo2(P1-xVx)2O8 fulfills the necessary condition for hosting the Kitaev-type interactions. In particular, for the x=0.15 composition, the dc and ac magnetic susceptibility results show a substantial enhancement below 100 K and a spin-glass ground state through Tg ~ 5 K. Given the small Curie-Weiss temperature (-3.2 K) relative to an energy scale of Tg, the antiferromagnetic Heisenberg and ferromagnetic Kitaev interactions are present. Thermodynamic measurements show that the application of an...

Quantum spin liquid ground state in the Co-based triangular antiferromagnet Na2BaCo(PO4)2

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A triangular lattice occupies a special position in the quantum spin-liquid (QSL) physics. Although the triangular-lattice Heisenberg antiferromagnet is known to evade a QSL, several ingredients including exchange randomness, spin-orbit coupling, anisotropic and biquadratic exchange interactions have been controversially discussed as a route to stabilize QSLs. Recently, the Co-based triangular antiferromagnet Na2BaCo(PO4)2 has emerged as a new candidate for QSL, The triangular layers of Co2+ (jeff = 1/2) ions are separated by a single layer...

Investigating the production of Roman gold coins in the ‘Year of the Four Emperors’

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For some 200 years, Roman gold coins anchored the Roman monetary system. Bronze and silver coins had a fixed relationship to the gold ones. When both the fineness and the weight standard of the gold coinage were radically reduced in the mid-third century AD, it appears this fixed relationship finally collapsed and a fundamental shift in Roman economy was caused. The fabric of Roman gold coins is, then, a highly important part of Roman economic...

Investigating Mesoporosity in Hierarchical Aluminophosphates

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Optimising catalyst lifetime and performance is pivotal to enhancing the sustainability of industrial catalytic processes, allowing greater product yields, at lower temperatures, with less regular catalyst regeneration. As such Hierarchically Porous SAPOs (HP-SAPOs) have been developed, where mesopores are also incorporated into the material, aiding reactant and product diffusion, and extending catalyst lifetime. We have recently developed a range of HP-SAPO materials by including the mesopore template; DMOD in the AlPO synthesis, to tailor mesopore...

Completing the phase diagram of a 2D molecular antiferromagnet

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Low-dimensional quantum magnetism continues to be of great theoretical and experimental interest as reduced dimensionality supports strong quantum fluctuations which can result in novel excitations and critical behaviour. Here we propose to complete an investigation of the phase diagram of a series of molecular 2D quantum Heisenberg antiferromagnets with random exchange strengths. This is a project started at PSI by Dr Fan Xiao, where materials from the series (QuinH)2Cu(Br(1-x)Clx)4.2H2O with x < 0.5 were successfully...

Study on Magnetism of Defective Reduced Graphene Oxide (rGO)

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Reduced graphene oxide (rGO) is a fascinating system having significant defects and functional group on its sheets, hence provides an ideal playground to raise magnetism of intrinsically nonmagnetic graphene. rGO have been reported to exhibit various magnetic states, in which their origin has been believed to be related with defect states in the rGO sheet. An enhancement in magnetization with a small magnetic hysteresis was observed in rGO when the amount of defect increases confirming...

The effect of strain on lattice alterations in quartz associated with ballistic impacts on sandstone

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While destruction of heritage during armed conflict is not a new phenomenon, the targeted cultural vandalism and associated social media campaign instigated by IS/Daesh has thrust heritage destruction in the global spotlight. Even though use of explosives and contemporary weaponry has caused extensive damage to heritage sites, they are not beyond rescue. However, little is known about alteration of sedimentary stone and in particular the phase changes in quartz associatedwith these impacts. These phase changes...

Structures of phenol-ammonia and phenol-water compounds

Phenol-water and phenol-ammonia clusters are useful model systems for understanding the types of proton-transfer interactions that occur during photosynthesis in plants and bacteria. However, almost nothing is known about these complexes in the solid state. Since these appear to be excellent candidates to undergo solid-state proton transfer under slight degrees of compression, structure determinations at low temperature and later under hydrostatic pressure are required. The aim of this work is to carry out low-temperature structural...

Registration Year

  • 2019
    5,784

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  • Dataset
    5,784