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Kiecana, A. (author), Kwakernaak, C. (author), van Dijk, N.H. (author), Brück, E.H. (author)The effect of the heat treatment on the magnetism, magnetocaloric effect and microstructure formation has been systematically studied in Fe-rich (Mn,Fe)<sub>y</sub>(P,Si) melt-spun ribbons (1.80 ≤ y ≤ 2.00). XRD, SEM and EDS measurements demonstrate that a metal deficiency prompts the stable (Mn,Fe)Si phase, whereas in the metal-rich region...journal article 2023
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Zhang, F. (author), Smits, Sebastian (author), Kiecana, A. (author), Batashev, I. (author), Shen, Q. (author), van Dijk, N.H. (author), Brück, E.H. (author)The influence of doping with the 5d transition metal W has been studied in the quaternary (Mn,Fe)<sub>2</sub>(P,Si) based giant magnetocaloric compounds, which is one of the most promising systems for magnetic refrigeration. It is found that W substitution can separately decrease the Curie temperature T<sub>C</sub> and retain the thermal...journal article 2023
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Zhang, F. (author), Batashev, I. (author), van Dijk, N.H. (author), Brück, E.H. (author)The influence of off-stoichiometry and of doping with the 5d transition metal Ta has been studied in the quaternary (Mn,Fe)<sub>2</sub>(P,Si)-based compound, which is one of the most promising materials systems for magnetic refrigeration. It is found that Ta substitution can decrease the transition temperature T<sub>tr</sub>, while the...journal article 2023
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Shen, Q. (author), Zhang, F. (author), Dugulan, A.I. (author), van Dijk, N.H. (author), Brück, E.H. (author)In this work, the magnetocaloric effect and negative thermal expansion in melt-spun Fe<sub>2</sub>Hf<sub>0.83</sub>Ta<sub>0.17</sub> Laves phase alloys were studied. Compared to arc-melted alloys, which undergo a first-order magnetoelastic transition from the ferromagnetic to the antiferromagnetic phase, melt-spun alloys exhibit a second...journal article 2023
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Kiecana, A. (author), Schaefers, W. (author), Thijs, M. (author), Dankelman, B.J.R. (author), Ojiyed, H. (author), Batashev, I. (author), Zhang, F. (author), van Dijk, N.H. (author), Brück, E.H. (author)Structural, magnetic and magnetocaloric properties of Mn<sub>3</sub>Sn<sub>1-</sub><sub>x</sub>Zn<sub>x</sub>C antiperovskite carbides have been studied. With increasing Zn content the first-order magnetic transition (FOMT) is weakened. The Curie temperature (T<sub>C</sub>) reduces first from 273 to 197 K and when x > 0.3, T<sub>C</sub>...journal article 2023
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Shen, Q. (author), Batashev, I. (author), Zhang, F. (author), Ojiyed, Hamutu (author), Dugulan, A.I. (author), van Dijk, N.H. (author), Brück, E.H. (author)The transition-metal based Laves phase materials represent an extended family of alloys with rich and fascinating physical properties. In this work, we have investigated the negative thermal expansion and magnetocaloric effect in arc-melted and melt-spun Fe<sub>2</sub>Hf<sub>1-</sub><sub>x</sub>Ti<sub>x</sub> (x = 0.15, 0.27, 0.30, 0.33, 0.36...journal article 2023
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Pineda Quijano, D.F. (author), Infante Ferreira, C.A. (author), Brück, E.H. (author)The development of affordable magnetocaloric materials (MCM) with a giant magnetocaloric effect (MCE) has brought magnetocaloric heat pumps a step closer to commercialization. The narrow temperature range in which these materials exhibit a large MCE demands the use of several materials with Curie temperatures covering the temperature span of...journal article 2023
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Zhang, F. (author), Bykov, Eduard (author), Gottschall, Tino (author), van Dijk, N.H. (author), Brück, E.H. (author)The orthorhombic MnCoSi compounds have been found to present a large magnetoelastic coupling, which is regarded as the source for the magnetocaloric effect (MCE) and the magnetostrictive effect. As a result, these compounds are potential materials for caloric applications such as solid-state refrigeration. In the present study, we offer...journal article 2023
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Belloni, C. (author), Korving, L. (author), Witkamp, G.J. (author), Brück, E.H. (author), Dugulan, A.I. (author)Phosphorus (P) removal from freshwater bodies to ultra-low concentrations is fundamental to prevent eutrophication, while its recovery is necessary to close the P usage cycle. Iron oxide-based adsorbents seem promising candidates, being abundant, cheap, and easy to synthesize compounds, with good affinity for P. Affinity is the key parameter...journal article 2023
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Belloni, C. (author), Korving, L. (author), Witkamp, G. J. (author), Brück, E.H. (author), de Jager, P. (author), Dugulan, A.I. (author)Hybrid anion exchange adsorbents (HAIX) seem promising to prevent eutrophication and recover phosphate (P). HAIX consist of an anion exchange resin (AIX) backbone, promoting anion physisorption (outer-sphere complex), impregnated with iron (hydr)oxide nanoparticles (NPs), for selective P chemisorption (inner-sphere complex). In this work, for...journal article 2023
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Wu, Z. (author), De Krom, Tom (author), Colombi, G. (author), Chaykina, D. (author), Van Hattem, Gijs (author), Schut, H. (author), Dickmann, Marcel (author), Brück, E.H. (author), Dam, B. (author), Eijt, S.W.H. (author)Rare-earth (RE) oxyhydride thin films show a color-neutral, reversible photochromic effect at ambient conditions. The origin of the photochromism is the topic of current investigations. Here, we investigated the lattice defects, electronic structure, and crystal structure of photochromic YHxOy and GdHxOy thin films deposited by magnetron...journal article 2022
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Ariëns, M.I. (author), van de Water, L. G.A. (author), Dugulan, A.I. (author), Brück, E.H. (author), Hensen, E. J.M. (author)Copper promotion of chromium-doped iron oxide prepared via co-precipitation for high-temperature water–gas shift (WGS) catalysis is investigated. Low-temperature Mössbauer spectra demonstrate that copper doping delays hematite (α-Fe<sub>2</sub>O<sub>3</sub>) formation in the fresh catalyst, favoring the formation of small crystallites of...journal article 2022
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Shen, Q. (author), Batashev, I. (author), Ojiyed, Hamutu (author), Zhang, F. (author), van Dijk, N.H. (author), Brück, E.H. (author)The influence of excess Mn on the magnetoelastic ferromagnetic-to-antiferromagnetic transition T<sub>t</sub> in the magnetocaloric compound (Mn,Cr)<sub>2</sub>Sb has been studied. With increasing excess Mn the magnetoelastic transition temperature for (Mn,Cr)<sub>2</sub>Sb initially increases and then decreases. This trend is accompanied by a...journal article 2022
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Zhang, F. (author), Taake, Chris (author), Huang, B. (author), You, X. (author), Ojiyed, Hamutu (author), Shen, Q. (author), Dugulan, A.I. (author), Caron, Luana (author), van Dijk, N.H. (author), Brück, E.H. (author)In the field of nanoscale magnetocaloric materials, novel concepts like micro-refrigerators, thermal switches, microfluidic pumps, energy harvesting devices and biomedical applications have been proposed. However, reports on nanoscale (Mn,Fe)<sub>2</sub>(P,Si)-based materials, which are one of the most promising bulk materials for solid-state...journal article 2022
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You, X. (author), Maschek, M. (author), van Dijk, N.H. (author), Brück, E.H. (author)The phase diagram of the magnetocaloric Mn<sub>x</sub> Fe<sub>2−x</sub> P<sub>1−y</sub> Si<sub>y</sub> quaternary compounds was established by characterising the structure, thermal and magnetic properties in a wide range of compositions (for a Mn fraction of 0.3 ≤ x < 2.0 and a Si fraction of 0.33 ≤ y ≤ 0.60). The highest ferromagnetic...journal article 2022
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Zhang, F. (author), Westra, Kevin (author), Shen, Q. (author), Batashev, I. (author), Kiecana, A. (author), van Dijk, N.H. (author), Brück, E.H. (author)The novel all-d-metal Ni(Co)MnTi based magnetic Heusler alloys provide an adjustable giant magnetocaloric effect and good mechanical properties. We report that the second-order magnetic phase transition can be tailored in this all-d-metal NiCoMnTi based Heusler system by optimizing the Mn/Ti ratio, resulting in a reversible ferromagnetic-to...journal article 2022
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Zhang, F. (author), Batashev, I. (author), van Dijk, N.H. (author), Brück, E.H. (author)The all-d-metal Ni-(Co)-Mn-Ti-based Heusler alloys are found to show a giant magnetocaloric effect near room temperature and are thereby potential materials for solid-state refrigeration. However, the relative large thermal hysteresis and the moderate ferromagnetic magnetization provides limitations for real applications. In the present study...journal article 2022
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Zhang, F. (author), Batashev, I. (author), Shen, Q. (author), Wu, Z. (author), Smith, Ronald I. (author), de Wijs, Gilles A. (author), van Dijk, N.H. (author), Brück, E.H. (author)The quarternary (Mn,Fe)<sub>2</sub>(P,Si)-based materials with a giant magnetocaloric effect (GMCE) at the ferromagnetic transition T<sub>C</sub> are promising bulk materials for solid-state magnetic refrigeration. In the present study we demonstrate that doping with the light elements fluorine and sulfur can be used to adjust T<sub>C</sub>...journal article 2022
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Kiecana, A. (author), Batashev, I. (author), Dugulan, A.I. (author), Kwakernaak, C. (author), Pieter, L. (author), Zhang, F. (author), van Dijk, N.H. (author), Brück, E.H. (author)The effect of Co and Ni doping on the structure, magnetic and magnetocaloric properties of Fe-rich (Mn,Fe)<sub>2</sub>(P,Si) compounds was studied. With increasing Co and Ni content, both the Curie temperature (T<sub>c</sub>) and the thermal hysteresis (ΔT<sub>hys</sub>) decreased, whereas the hexagonal P-62 m crystal structure was maintained...journal article 2022
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Lai, J. (author), You, X. (author), Law, Jiayan (author), Franco, Victorino (author), Huang, B. (author), Bessas, Dimitrios (author), Maschek, M. (author), Zeng, Dechang (author), van Dijk, N.H. (author), Brück, E.H. (author)Large thermal hysteresis in the (Mn,Fe)2(P,Si) system hinders an efficient heat exchange and thus limits the magnetocaloric applications. Substitution of manganese by vanadium in the Mn1-x1Vx1Fe0.95P0.593Si0.33B0.077 and Mn1-x2Vx2Fe0.95P0.563Si0.36B0.077 compounds enable a significant reduction in the thermal hysteresis without losing the giant...journal article 2022