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28 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3 [Next/Last]

Instruments / Technical Area	Publication Details	Published
I11-High Resolution Powder Diffraction	Differential adsorption of L- and D-lysine on achiral MFI zeolites as determined by synchrotron X-ray powder diffraction and thermogravimetric analysis Tianxiang Chen , Bolong Huang , Sarah Day , Chiu Chung Tang , Shik Chi Edman Tsang , Kwok-yin Wong , Tsz Woon Benedict Lo Angewandte Chemie International Edition DOI: 10.1002/anie.201909352 Diamond Proposal Number(s): [23230] Show Abstract ▼ Abstract: We report the first crystallographic observation of stereospecific bindings of L‐ and D‐lysine in achiral MFI zeolites. The MFI structure has offered inherent geometric and internal confinement effects for the enantiomeric difference in L‐ and D‐lysine adsorption. Notable difference over the sorption properties has been observed by circular dichroism (CD) spectroscopy and thermogravimetric analysis (TGA). Distinct L‐ and D‐lysine adsorption behaviours on the H‐ZSM‐5 framework have been revealed by the Rietveld refinement of high‐resolution synchrotron X‐ray powder diffraction (SXRD) data and the density functional theory (DFT) calculation. Despite only demonstrated in L‐ and D‐lysine over MFI zeolites, the differential adsorption study sheds light towards the rational engineering of molecular interactions(s) with achiral microporous materials for chiral separation purposes.	Nov 2019
I11-High Resolution Powder Diffraction	Capacity fading mechanisms of NCM-811 cathodes in lithium-ion batteries studied by X-ray diffraction and other diagnostics Franziska Friedrich , Benjamin Strehle , Anna Freiberg , Karin Kleiner , Sarah J. Day , Christoph Erk , Michele Piana , Hubert A. Gasteiger Journal Of The Electrochemical Society 166, A3760 - A3774 DOI: 10.1149/2.0821915jes Diamond Proposal Number(s): [16866] Open Access Show Abstract ▼ Abstract: Ni-rich layered oxides, like NCM-811, are promising lithium-ion battery cathode materials for applications such as electric vehicles. However, pronounced capacity fading, especially at high voltages, still lead to a limited cycle life, whereby the underlying degradation mechanisms, e.g. whether they are detrimental reactions in the bulk or at the surface, are still controversially discussed. Here, we investigate the capacity fading of NCM-811/graphite full-cells over 1000 cycles by a combination of in situ synchrotron X-ray powder diffraction, impedance spectroscopy, and X-ray photoelectron spectroscopy. In order to focus on the NCM-811 material, we excluded Li loss at the anode by pre-lithiating the graphite. We were able to find a quantitative correlation between NCM-811 lattice parameters and capacity fading. Our results prove that there are no considerable changes in the bulk structure, which could be responsible for the observed ≈20% capacity loss over the 1000 cycles. However, we identified the formation of a resistive surface layer, which is responsible for (i) an irreversible loss of capacity due to the material lost for its formation, and (ii) for a considerable impedance growth. Further evidence is provided that the surface layer is gradually formed around the primary NCM-811 particles.	Nov 2019
B22-Multimode InfraRed imaging And Microspectroscopy	Reversible coordinative binding and separation of sulfur dioxide in a robust metal–organic framework with open copper sites Gemma L. Smith , Jennifer E. Eyley , Xue Han , Xinran Zhang , Jiangnan Li , Nicholas M. Jacques , Harry G. W. Godfrey , Stephen P. Argent , Laura J. Mccormick Mcpherson , Simon J. Teat , Yongqiang Cheng , Mark D. Frogley , Gianfelice Cinque , Sarah Day , Chiu C. Tang , Timothy L. Easun , Svemir Rudic , Anibal J. Ramirez-cuesta , Sihai Yang , Martin Schroeder Nature Materials 29 DOI: 10.1038/s41563-019-0495-0 Show Abstract ▼ Abstract: Emissions of SO2 from flue gas and marine transport have detrimental impacts on the environment and human health, but SO2 is also an important industrial feedstock if it can be recovered, stored and transported efficiently. Here we report the exceptional adsorption and separation of SO2 in a porous material, [Cu2(L)] (H4L = 4′,4‴-(pyridine-3,5-diyl)bis([1,1′-biphenyl]-3,5-dicarboxylic acid)), MFM-170. MFM-170 exhibits fully reversible SO2 uptake of 17.5 mmol g−1 at 298 K and 1.0 bar, and the SO2 binding domains for trapped molecules within MFM-170 have been determined. We report the reversible coordination of SO2 to open Cu(ii) sites, which contributes to excellent adsorption thermodynamics and selectivities for SO2 binding and facile regeneration of MFM-170 after desorption. MFM-170 is stable to water, acid and base and shows great promise for the dynamic separation of SO2 from simulated flue gas mixtures, as confirmed by breakthrough experiments.	Oct 2019
I11-High Resolution Powder Diffraction	Fine control of Curie temperature of magnetocaloric alloys La(Fe,Co,Si)13 using electrolytic hydriding Liya Guo , Edmund Lovell , Qiwei Tang , David C. Boldrin , Chiu C. Tang , Sarah J. Day , Lesley F. Cohen , Mary P. Ryan Scripta Materialia 175, 33 - 37 DOI: 10.1016/j.scriptamat.2019.08.017 Diamond Proposal Number(s): [19792] Show Abstract ▼ Abstract: This work demonstrates precision control of hydrogen content in La(Fe,Co,Si)13Hδ for the development of environmentally friendly magnetocaloric-based cooling technologies, using an electrolytic hydriding technique. We show the Curie temperature, a critical parameter which directly governs the temperature window of effective cooling, can be varied easily and reproducibly in 1 K steps within the range 274 K to 402 K. Importantly, both partially (up to 10%) and fully hydrided compositions retain favorable entropy change values comparable to that of the base composition. Crucially, we show in these second-order phase transition compounds, partial hydriding is stable and not susceptible against phase separation.	Oct 2019
I11-High Resolution Powder Diffraction	Thermally-induced phase transformations in KNNS-BNKZ lead-free piezoceramics J. Tangsritrakul , C. C. Tang , Sarah Day , David Hall Journal Of The European Ceramic Society DOI: 10.1016/j.jeurceramsoc.2019.10.009 Diamond Proposal Number(s): [13116] Show Abstract ▼ Abstract: Promising piezoelectric properties have been reported in potassium sodium niobate-based ceramics by introducing Bi0.5(Na0.82K0.18)0.5ZrO3 (BNKZ) into K0.48Na0.52Nb0.95Sb0.05O3 (KNNS) solid solutions in order to control the polymorphic phase transformation temperatures. In the present study, synchrotron x-ray powder diffraction (SXPD) was employed in combination with dielectric and ferroelectric measurements in order to clarify the influence of BNKZ on the phase transition temperatures of (1-x)KNNS-(x)BNKZ ceramics (with x = 0 to 0.05). The results, presented in terms of temperature-dependent SXPD patterns, dielectric permittivity and thermal depolarisation characteristics, confirmed that polymorphic phase transformation temperatures all shifted in a systematic manner with increasing BNKZ content. Broadening of the phase transition regions was also observed with increasing BNKZ content, leading to improvements in thermal stability of the ferroelectric properties. Microstructural examination of the KNNS-BNKZ ceramics revealed the presence of core-shell microstructures; this was correlated with the presence of weak shoulders on the diffraction peaks.	Oct 2019
I11-High Resolution Powder Diffraction	The properties of methane clathrate in the presence of ammonium sulphate solutions with relevance to Titan Emmal Safi , Stephen P. Thompson , Aneurin Evans , Sarah J. Day , Claire A. Murray , Annabelle R. Baker , Joana M. Oliveira , Jaco Th. Van Loon EPSC-DPS Joint Meeting 2019 Show Abstract ▼ Abstract: The source of atmospheric methane on Saturn’s satellite Titan is currently unknown. However, one possibility is that it originates from clathrate hydrates formed below the surface. Titan’s sub-surface ocean is believed to be composed of saline, rather than pure, water and in situ experimental data on clathrate formation under these conditions are largely absent in literature. Here, synchrotron X-ray powder diﬀraction (SXRPD) is used to study the properties of methane clathrate hydrates formed in the presence of ammonium sulphate solutions under low temperature conditions with a pressure of 26 bar.	Sep 2019
I11-High Resolution Powder Diffraction	The structure and thermoelectric properties of tungsten bronze Ba6Ti2Nb8O30 Dongting Jiang , Dursun Ekren , Feridoon Azough , Sarah Day , Kan Chen , Amit Mahajan , Demie M. Kepaptsoglou , Quentin M. Ramasse , Michael J. Reece , Robert Freer Journal Of Applied Physics 126 DOI: 10.1063/1.5119962 Show Abstract ▼ Abstract: Tungsten bronze (TB) structured materials have attracted attention as possible thermoelectrics because of their complex crystal structure. In this work, a new thermoelectric ceramic with a tetragonal tungsten bronze (TB) structure, Ba6Ti2Nb8O30 (BTN), was prepared by the conventional mixed oxide route with some samples processed by Spark Plasma Sintering (SPS). The addition of MnO enabled the fabrication of high density BTN ceramics at a low sintering temperature of 1580 K in air and by SPS. All samples were annealed in a reducing atmosphere after sintering. X-ray diffraction showed that Ba6Ti2Nb8O30 crystallizes with tetragonal symmetry (P4bm space group). High angle annular dark field-electron energy loss spectroscopy analysis confirmed the proposed crystal structure and provided exact elemental distributions in the lattice, showing higher concentrations of Ti in the 2b lattice sites compared to the 8d lattice sites. XPS showed the presence of two spin-orbit double peaks at 207.7 eV in the reduced BTN samples, confirming the presence of Nb4+ ions. By the use of a sintering aid and optimization of the processing parameters, the ceramics achieved a high power factor of 280 μW/m K2 at 873 K. The BTN ceramics showed phonon-glass-type thermal conduction behavior with a low thermal conductivity of 1.7–1.65 W/m K at 300–873 K. A thermoelectric figure of merit (ZT) of 0.14 was achieved at 873 K. This ZT value is comparable with results for many TB thermoelectrics. However, BTN has the advantage of much easier processing.	Sep 2019
I11-High Resolution Powder Diffraction	In-situ electrochemical X-ray diffraction: A rigorous method to navigate within phase diagrams reveals β-Fe1+xSe as superconductor for all x Bertold Rasche , Minjun Yang , Lothar Nikonow , Joshaniel F. K. Cooper , Claire A. Murray , Sarah J. Day , Karin Kleiner , Simon J. Clarke , Richard G. Compton Angewandte Chemie International Edition DOI: 10.1002/anie.201907426 Diamond Proposal Number(s): [20638] Show Abstract ▼ Abstract: We report the precise postsynthetic control of the composition of β‐Fe1+xSe by electrochemistry with simultaneous tracking of the associated structural changes via in‐situ synchrotron X‐ray diffraction. We access the full phase width of 0.01 < x < 0.04 and identify the superconducting state below 8 K, which in contrast to earlier reports is independent of the composition. However, in a second set of in‐situ X‐ray diffraction experiments, we demonstrate that β‐Fe1+xSe forms a new phase in the presence of oxygen above a 100 °C which has the same anti‐PbO type structure but is not superconducting down to 1.8 K. The latter process can be reversed electrochemically to reinstate the superconducting state. These observations exploit the exquisite control afforded by electrochemistry in contrast with classical approaches of chemical synthesis.	Aug 2019
I11-High Resolution Powder Diffraction	Mapping the structural transitions controlled by the trilinear coupling in Ca 3- x Sr x Ti 2 O 7 Marie Kratochvilova , Fei-ting Huang , Maria-teresa Fernandez Diaz , Milan Klicpera , Sarah Day , Stephen P. Thompson , Yoon-seok Oh , Bin Gao , Sang-wook Cheong , Je-geun Park Journal Of Applied Physics 125 DOI: 10.1063/1.5089723 Diamond Proposal Number(s): [16074] Show Abstract ▼ Abstract: We present the results of the high-temperature neutron and x-ray diffraction experiments on the Ca3–xSrxTi2O7 (x = 0.5, 0.8, 0.85, 0.9) compounds. The ferro- to paraelectric transition in these hybrid improper ferroelectric materials arises from the so-called trilinear coupling. Depending on the strontium content, various structures and phase transitions, different from theoretical predictions, emerge. The in situ x-ray powder diffraction indicates a direct ferro- to paraelectric transition between the orthorhombic A21am and the tetragonal undistorted I4/mmm phase for x ≤ 0.6. We identified a reduction in the trilinear coupling robustness by increasing the Sr-doping level to lead to the emergence of the intermediate tetragonal P42/mnm phase and the gradual suppression of the orthorhombic phase. The observed character of the structure transitions and the Ca3–xSrxTi2O7 phase diagram are discussed in the framework of theoretical models of other related hybrid improper ferroelectric systems.	Jun 2019
I11-High Resolution Powder Diffraction	Exploring the rate dependence of phase evolution in P2-type Na 2/3 Mn 0.8 Fe 0.1 Ti 0.1 O 2 Damian Goonetilleke , Sunny Wang , Elena Gonzalo , Montserrat Galcerán , Damien Saurel , Sarah J. Day , Francois Fauth , Teófilo Rojo , Neeraj Sharma Journal Of Materials Chemistry A 16 DOI: 10.1039/C9TA01366K Diamond Proposal Number(s): [14512] Show Abstract ▼ Abstract: P2-type Na2/3Mn0.8Fe0.1Ti0.1O2, a promising high-performance electrode material for use in ambient temperature sodium-ion batteries, is examined using operando and long-term in situ synchrotron X-ray diffraction studies to reveal the structural evolution during battery function. Variable current cycling at current rates as high as 526 mA g−1 (4C) over a wide voltage window (1.5 V to 4.2 V) reveals that the structural transitions of the positive electrode material at higher currents may be suppressed by kinetic limitations which reduce the magnitude of change of the sodium content in the electrode. At low currents, when maximum desodiation is achieved, a collapse in the c lattice parameter is observed as the cell reaches the charged state, however this behaviour is not observed during cycling at higher currents.	Apr 2019

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