639 Works

Battery Material Candidates Sample 1

Investigation of magnetism in layered two-dimensional triangular lattice oxide LixCoO2

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The compound LiCoO2 has attracted lots of attention in the recent years because of its application in Li-ion batteries. Investigation of the magnetism in LixCoO2, using the single crystals have not been reported thus far. The crystal structure contains CoO2 layers arranged on a 2D triangular lattice. The presence of antiferromagentic interaction between the magnetic Co ions is expected to give rise to a geometrical frustration (due to the triangular geometry) and novel magnetic states...

Plant Antimicrobial Protein Interactions with Self-Assembled Floating Membrane Models of Plant and Bacterial Membranes

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Previously (RB1910140) we developed free floating model plant and pathogen membranes where complex unsaturated lipid mixtures and sterols which can be self-assembled adjacent to anionic PEGylated thiol self-assembling monolayers (SAM). Here, we will examine the interaction of plant defence protein purothionin, under physiologically accurate conditions using this sample system. Furthermore, we will examine whether this novel sample system has any particular issues relating to this kind of interaction studies and how the disruption of the...

Use of Negative Muons for depth profiles characterization of metallic Roman finds

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The gilded bronzes from Cartoceto di Pergola, are a Roman equestrian statuary group composed of two knights, two horses and two standing women; they represent the only sculptural group in gilded bronze of archaeological origin remaining from the Roman era. Two sets of metal samples of different materials, of Roman periods and contexts were selected: N.3 fragments of gilded bronze from the sculptural group of Cartoceto, sporadic with traces of gilding and mineralization on the...

Determining the magnetic structure of novel binary oxide Ba7Mn4O15

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A novel binary oxide of manganese, Ba7Mn4O15 has been synthesised for the first time. It is of interest due to the dimer physics associate with the Mn2O9 face sharing octrahedra, low dimension spin order, and because of the potential for magnetoelectric coupling, recently highlighted in isostructural Sr7Mn4O15. Our provisional characterisation of Ba7Mn4O15 show a divergence between field-cooled and zero field-cooled magnetic susceptibility measurements at 50 K, indicating the onset of AFM magnetic ordering. We propose...

Interplay between magnetism and superconductivity in the FeYSr2Cu2Oy iron substituted cuprate

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We want to address the problem of a possible coexistence of superconductivity and magnetism in the FeSr2YCu2Oy cuprate by means of a combined ZF/TF-muSR study. This compound presents a laminar ordering of copper and iron along the crystallographic c axis, allowing the study of the iron oxidation state effect in the superconducting and magnetic properties of this material. We have observed a progressive evolution from a magnetic parent compound at low doping levels to a...

Elucidating the Structure of Lithium Polysulfide by Complementary X-ray and Neutron Total Scattering

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Lithium-sulfur batteries are an emerging class of rechargeable electrochemical cells with applications in speciality electric vehicles, including aviation, and grid-scale energy storage. The high theoretical specific capacity, energy density and the potentially low cost have led to significant scientific and industrial interest. Despite their fundamental importance, our understanding of liquid phase lithium polysulfide structures and transformations is limited. These species cannot be observed by X-ray diffraction, thus techniques that can probe local structure under in...

Magnetic anisotropy and crystal structure distortions in ErB4

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We propose to investigate the unusual low-temperature behaviour of single crystal ErB4 in an applied magnetic field. At room temperature, the compound has a tetragonal structure in which the magnetic Er ions form a network of squares and triangles in that maps to the Shastry-Sutherland lattice, a rare example of highly frustrated system with an exact ground state solution. It has recently been found through the magnetisation and magnetostriction measurements that a significant anisotropy of...

Magnetic structure of a new quantum magnet

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CaCuTe2O6 belongs to the family of ACuTe2O6 that consists of a 3-dimensional arrangement of spin-1/2 Cu ions. Three main interactions are relevant in the system where the first neighbor interaction (J3) couples the Cu ions into isolated triangles, the second (J2) couples them into the highly frustrated hyperkagome lattice consisting of corner sharing triangles and the third neighbor interaction (J3) couples them into antiferromagnetic chains. J3 dominates the magnetism of CaCuTe2O6 where antiferromagnetic chains are...

Field-driven closure of the Haldane gap in an ideal coordination polymer spin-chain

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Chains comprising integer spin magnetic moments exhibit the celebrated non-magnetic Haldane phase, which is very different relative to the half-integer spin equivalent. We have recently discovered and characterised a molecule-based magnet system which is an ideal example of a Haldane chain, NiI2(3,5-lut)4. Crucially, deviations from the idealised spin-one chain are exceedingly small in this compound. Zero-field Inelastic neutron scattering at ISIS was successfully used to study the magnetic excitations in this system at zero-field, including...

µSR study to investigate the nature of the anomalous high-temperature phase transition in Ce2Rh2Ga

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Compounds of the element Cerium occupy a special place in contemporary condensed matterphysics. These materials have become known for a unconventional magnetism andsuperconductivity, as well as new phases of matter at very low temperatures. The subject of thisproposal, Ce2Rh2Ga, has a phase transition at T*=130 K which is extraordinary for a ceriumcompound. Sharp anomalies are found in the temperature dependence of physical propertiesprobed thus far including magnetic susceptibility, electrical and thermal transport, and specificheat. In...

The low-temperature structural phase transition in CuSO4·5D2O as a function of pressure

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Copper sulfate pentahydrate is a common material with a long history of use in testing crystallographic theories and methods. Much of the interest in its behaviour as a model 1-dimensional magnetic system at low T is predicated upon there being no structural phase transition on cooling from room-temperature to 1 Kelvin. However, we now know there to be a structural transition at 32 K in which the unit cell doubles along the a- and c-axis...

Low temperature ordering of spinel LNMO cathode material

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Long term cycling stability and high energy and power density are key characteristics for battery materials, especially for applications within the field of electric vehicles. LNMO is an interesting candidate material due to its high energy and power density. Depending on the ordering of the atoms within LNMO (mainly Ni and Mn), the material can adopt two different structures. This subtle difference in atomic arrangement leads to differences in the electrochemical behavior, e.g. in the...

Low temperature ordering of spinel LNMO cathode material

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Long term cycling stability and high energy and power density are key characteristics for battery materials, especially for applications within the field of electric vehicles. LNMO is an interesting candidate material due to its high energy and power density. Depending on the ordering of the atoms within LNMO (mainly Ni and Mn), the material can adopt two different structures. This subtle difference in atomic arrangement leads to differences in the electrochemical behavior, e.g. in the...

Magnetically frustrated ground state of an Yb-based semiconductor YbCuS2 with an effective spin-1/2 zigzag chain

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In the present work, we focus on an Yb-based semiconductor YbCuS2, which has been recently proposed as the first substance exhibiting peculiar quantum phases due to the frustrated Yb zigzag chain. We have studied the magnetic and thermal properties of the semiconducting compound YbCuS2 and revealed a phase transition occurs at To = 0.95 K. The magnetic entropy at To is reduced to 20% of Rlog2, which indicates the magnetic fluctuations above To. Moreover, The...

Energy scales in the possible multiple-q phase of antlerite

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The crystal structure of the natural mineral antlerite is built up from ribbons of copper atoms, where the copper atoms are arranged in a three-leg ladder with triangular rungs instead of square. This structure is extremely rare, and it is not yet known what unusual forms of magnetism it can lead to. The magnetic moments on the central leg have been reported to do nothing magnetically, but we have found that this is incorrect. We...

Phase-change mechanism in Ga2Te3 liquid promising for high-temperature memory applications

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Phase-change materials (PCM) based on tellurides are widely used for optical storage, non-volatile memory applications and recently for neuromorphic computing. The flagship PCMs are based on germanium tellurides: GeTe, Ge2Sb2Te5, etc. which exhibit low glass transition temperatures Tg in the RESET (amorphous) state and can hardly be used above 380 K. Gallium tellurides have superior melting points and higher Tg and appear to be promising materials for memory applications at elevated temperatures. Fast transformation rate...

The mechanical stability of austenite in 3rd generation advanced high strength steels

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Advanced High Strength Steels are of great interest for the automotive industry. The key to getting an optimal mechanical response of these steels is to control the deformation-induced austenite to martensite transformation. However, the austenite resistance to transformation has not been well understood yet due to the complexities involved in studying the transformation process and decoupling the different microstructural factors influencing the stress/strain-induced transformation. In order to identify the role of the starting microstructure on...

Registration Year

  • 2021
    639

Resource Types

  • Dataset
    639

Affiliations

  • Cardiff University
    1