Publications
448 results found
Pires AL, Belo JH, Turcaud J, et al., 2015, Influence of short time milling in R<sub>5</sub>(Si,Ge)<sub>4</sub>, R = Gd and Tb, magnetocaloric materials, MATERIALS & DESIGN, Vol: 85, Pages: 32-38, ISSN: 0264-1275
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- Citations: 26
Turcaud JA, Bez HN, Ruiz-Trejo E, et al., 2015, Influence of manganite powder grain size and Ag-particle coating on the magnetocaloric effect and the active magnetic regenerator performance, ACTA MATERIALIA, Vol: 97, Pages: 413-418, ISSN: 1359-6454
Bartok A, Kustov M, Cohen LF, et al., 2015, Study of the first paramagnetic to ferromagnetic transition in as prepared samples of Mn-Fe-P-Si magnetocaloric compounds prepared by different synthesis routes, Journal of Magnetism and Magnetic Materials, Vol: 400, Pages: 333-338, ISSN: 1873-4766
Magnetocaloric materials with composition of Mn1.3Fe0.65P0.5 Si0.5 have been prepared by ball milling and solid-state reaction methods and consolidated using powder annealing, and conventional and spark plasma sintering. Magnetic and calorimetric measurements show remarkable differences upon first cooling, and slight differences on second and further coolings between the samples prepared by different synthesis routes. Further measurements using Hall probe imaging in high magnetic field have been also carried out. As-prepared samples have been cooled down just above the critical temperature, and the first phase transition has been induced by application of a magnetic field. Bulk samples show staircase isothermal magnetization curves whereas powders show smoother transition curves.
Basso V, Kuepferling M, Curcio C, et al., 2015, Specific heat and entropy change at the first order phase transition of La(Fe-Mn-Si)(13)-H compounds, JOURNAL OF APPLIED PHYSICS, Vol: 118, ISSN: 0021-8979
Moseley D, Yates KA, Branford WR, et al., 2015, Signatures of filamentary superconductivity in antiferromagnetic BaFe2As2 single crystals, EPL, Vol: 111, ISSN: 0295-5075
Porcari G, Morrison K, Cugini F, et al., 2015, Influence of thermal conductivity on the dynamic response of magnetocaloric materials, International Journal of Refrigeration, Vol: 59, Pages: 29-36, ISSN: 1879-2081
We compare the magnetocaloric effect of samples prepared with different thermal conductivities to investigate the potential of composite materials. By applying the magnetic field under operating conditions we test the material's response and compare this to heat transfer simulations in order to check the reliability of the adiabatic temperature change probe used. As a result of this study we highlight how the material's thermal conductivity influences τ, the time constant of temperature change. This parameter ultimately limits the maximum frequency of a refrigerant cycle and offers fundamental information about the correlation between thermal conductivity and the magnetocaloric effect.
Duboviks V, Lomberg M, Maher RC, et al., 2015, Carbon deposition behaviour in metal-infiltrated gadolinia doped ceria electrodes for simulated biogas upgrading in solid oxide electrolysis cells, Journal of Power Sources, Vol: 293, Pages: 912-921, ISSN: 1873-2755
One of the attractive applications for reversible Solid Oxide Cells (SOCs) is to convert CO2 into CO via high temperature electrolysis, which is particularly important for biogas upgrading. To improve biogas utility, the CO2 component can be converted into fuel via electrolysis. A significant issue for SOC operation on biogas is carbon-induced catalyst deactivation. Nickel is widely used in SOC electrodes for reasons of cost and performance, but it has a low tolerance to carbon deposition. Two different modes of carbon formation on Ni-based electrodes are proposed in the present work based on ex-situ Raman measurements which are in agreement with previous studies. While copper is known to be resistant towards carbon formation, two significant issues have prevented its application in SOC electrodes – namely its relatively low melting temperature, inhibiting high temperature sintering, and low catalytic activity for hydrogen oxidation. In this study, the electrodes were prepared through a low temperature metal infiltration technique. Since the metal infiltration technique avoids high sintering temperatures, Cu–Ce0.9Gd0.1O2−δ (Cu-CGO) electrodes were fabricated and tested as an alternative to Ni-CGO electrodes. We demonstrate that the performance of Cu-CGO electrodes is equivalent to Ni-CGO electrodes, whilst carbon formation is fully suppressed when operated on biogas mixture.
Gilbertson AM, Francescato Y, Roschuk T, et al., 2015, Plasmon-Induced Optical Anisotropy in Hybrid Graphene-Metal Nanoparticle Systems, NANO LETTERS, Vol: 15, Pages: 3458-3464, ISSN: 1530-6984
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- Citations: 43
Turcaud JA, Pereira AM, Cohen LF, 2015, Quantifying the deleterious role of strong correlations in La<sub>1-<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> at the magnetocaloric transition, PHYSICAL REVIEW B, Vol: 91, ISSN: 2469-9950
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- Citations: 9
Lovell E, Pereira AM, Caplin AD, et al., 2015, Dynamics of the first-order metamagnetic transition in magnetocaloric La(Fe,Si)(13): Reducing hysteresis, Advanced Energy Materials, Vol: 5, ISSN: 1614-6840
The influence of dynamics and sample shape on the magnetic hysteresis in first‐order magnetocaloric metamagnetic LaFe13–xSix with x = 1.4 is studied. In solid‐state magnetic cooling, reducing magnetic and thermal hysteresis is critical for refrigeration cycle efficiency. From magnetization measurements, it is found that the fast field‐rate dependence of the hysteresis can be attributed to extrinsic heating directly related to the thickness of the sample and the thermal contact with the bath. If the field is paused partway through the transition, the subsequent relaxation is strongly dependent on shape due to both demagnetizing fields and thermal equilibration; magnetic coupling between adjacent sample fragments can also be significant. Judicious shaping of the sample can both increase the onset field of the ferromagnetic–paramagnetic (FM–PM) transition but have little effect on the PM–FM onset, suggesting a route to engineer the hysteresis width by appropriate design. In the field‐paused state, the relaxation from one phase to the other slows with increasing temperature, implying that the process is neither thermally activated or athermal; comparison with the temperature dependence of the latent heat strongly suggests that the dynamics reflect the intrinsic free energy difference between the two phases.
Moseley DA, Yates KA, Peng N, et al., 2015, Magnetotransport of proton-irradiated BaFe<sub>2</sub>As<sub>2</sub> and BaFe<sub>1.985</sub>Co<sub>0.015</sub>As<sub>2</sub> single crystals, PHYSICAL REVIEW B, Vol: 91, ISSN: 1098-0121
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- Citations: 9
Walton SK, Zeissler K, Burn DM, et al., 2015, Limitations in artificial spin ice path selectivity: the challenges beyond topological control, NEW JOURNAL OF PHYSICS, Vol: 17, ISSN: 1367-2630
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- Citations: 14
Turcaud JA, Pereira AM, Sandeman KG, et al., 2014, Spontaneous magnetization above T-C in polycrystalline La0.7Ca0.3MnO3 and La0.7Ba0.3MnO3, Physical Review B, Vol: 90, ISSN: 1550-235X
Duboviks V, Maher RC, Kishimoto M, et al., 2014, A Raman spectroscopic study of the carbon deposition mechanism on Ni/CGO electrodes during CO/CO2 electrolysis, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 16, Pages: 13063-13068, ISSN: 1463-9076
Turcaud JA, Morrison K, Pereira AM, et al., 2014, MAGNETOCALORIC EFFECTS IN MANGANITES REVISITED, 6th IIR/IIF International Conference on Magnetic Refrigeration (THERMAG), Publisher: INT INST REFRIGERATION, Pages: 15-16, ISSN: 0151-1637
Xiao Y, Kim H, Mattevi C, et al., 2013, Influence of Cu substrate topography on the growth morphology of chemical vapour deposited graphene, CARBON, Vol: 65, Pages: 7-12, ISSN: 0008-6223
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- Citations: 14
Ladak S, Ball JM, Moseley D, et al., 2013, Observation of wrinkle induced potential drops in biased chemically derived graphene thin film networks, CARBON, Vol: 64, Pages: 35-44, ISSN: 0008-6223
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- Citations: 9
Yates KA, Anwar MS, Aarts J, et al., 2013, Andreev spectroscopy of CrO<sub>2</sub> thin films on TiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>, EPL, Vol: 103, ISSN: 0295-5075
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- Citations: 14
Maher RC, Duboviks V, Offer GJ, et al., 2013, Raman Spectroscopy of Solid Oxide Fuel Cells: Technique Overview and Application to Carbon Deposition Analysis, FUEL CELLS, Vol: 13, Pages: 455-469, ISSN: 1615-6846
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- Citations: 41
Morrison K, Dupas A, Mudryk Y, et al., 2013, Identifying the critical point of the weakly first-order itinerant magnet DyCo<sub>2</sub> with complementary magnetization and calorimetric measurements, PHYSICAL REVIEW B, Vol: 87, ISSN: 2469-9950
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- Citations: 19
Turcaud JA, Morrison K, Berenov A, et al., 2013, Microstructural control and tuning of thermal conductivity in La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3±δ</sub>, SCRIPTA MATERIALIA, Vol: 68, Pages: 510-513, ISSN: 1359-6462
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- Citations: 19
Zeissler K, Walton SK, Ladak S, et al., 2013, The non-random walk of chiral magnetic charge carriers in artificial spin ice, Scientific Reports, Vol: 3, ISSN: 2045-2322
Salem-Sugui S, Ghivelder L, Alvarenga AD, et al., 2013, Vortex dynamics as a function of field orientation in BaFe<sub>1.9</sub>Ni<sub>0.1</sub>As<sub>2</sub>, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 26, ISSN: 0953-2048
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- Citations: 13
Xiao Y, Francescato Y, Giannini V, et al., 2013, Probing the dielectric response of graphene <i>via</i> dual-band plasmonic nanoresonators, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 15, Pages: 5395-5399, ISSN: 1463-9076
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- Citations: 10
Gilbertson A, Lambert CJ, Solin SA, et al., 2013, High Resolution InSb Quantum Well Ballistic Nanosensors For Room Temperature Applications, 31st International Conference on the Physics of Semiconductors (ICPS), Publisher: AMER INST PHYSICS, Pages: 111-+, ISSN: 0094-243X
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- Citations: 1
Duboviks V, Maher RC, Offer G, et al., 2013, <i>In</i>-<i>Operando</i> Raman Spectroscopy Study of Passivation Effects on Ni-CGO Electrodes in CO<sub>2</sub> Electrolysis Conditions, 13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII), Publisher: ELECTROCHEMICAL SOC INC, Pages: 3111-3117, ISSN: 1938-5862
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- Citations: 12
Maher RC, Duboviks V, Offer G, et al., 2013, In-operando Raman Characterization of Carbon Deposition on SOFC Anodes, 13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII), Publisher: ELECTROCHEMICAL SOC INC, Pages: 1619-1626, ISSN: 1938-5862
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- Citations: 2
Tran L, Solin SA, Gilbertson A, et al., 2013, Photon Induced Schottky Barrier Effects in Inverse-Extraordinary Optoconductance Structures, 31st International Conference on the Physics of Semiconductors (ICPS), Publisher: AMER INST PHYSICS, Pages: 417-+, ISSN: 0094-243X
Maher RC, Offer G, Brandon NP, et al., 2012, In-situ Raman characterization of SOFC anodes, Materials Research Society Symposium Proceedings, Vol: 1385, Pages: 25-34, ISSN: 0272-9172
Solid oxide fuel cells (SOFCs) have many advantages when compared to other fuel cell technologies, particularly for distributed stationary applications. As a consequence they are becoming ever more economically competitive with incumbent energy solutions. However, as with all technologies, improvements in durability, efficiency and cost is required before they become feasible alternatives. Such improvements are enabled through improved understanding of the critical material interactions occurring during operation. Raman spectroscopy is a noninvasive and non-destructive optical characterization tool which is ideally suited to the study of these critical chemical processes occurring within operational SOFCs. In this paper we will discuss advantages of using Raman characterization for understanding these important chemical processes occurring within SOFCs. We will present the specific examples of the type of measurement possible and discuss the direction of future research. © 2012 Materials Research Society.
Hannemann U, Lyubina J, Ryan MP, et al., 2012, Thermopower of LaFe<sub>13-x</sub>Si<sub>x</sub> alloys, EPL, Vol: 100, ISSN: 0295-5075
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- Citations: 9
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