Searched for: subject:"Magnetocaloric"
(1 - 20 of 20)
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Huang, B. (author), Miao, X.F. (author), Nguyên, V.T. (author), You, X. (author), Maschek, M. (author), van Eijck, L. (author), van Dijk, N.H. (author), Brück, E.H. (author)
Approaching the border of the first order transition and second order transition is significant to optimize the giant magnetocaloric materials performance. The influence of vanadium substitution in the Mn<sub>1.2-x</sub>V<sub>x</sub>Fe<sub>0.75</sub>P<sub>0.5</sub>Si<sub>0.5</sub> alloys is investigated for annealing temperatures of 1323,...
journal article 2019
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Boeije, M.F.J. (author), Maschek, M. (author), Miao, X.F. (author), Nguyên, V.T. (author), van Dijk, N.H. (author), Brück, E.H. (author)
Temperature dependent high-resolution x-ray diffraction measurements were used to characterize the magneto-elastic ferromagnetic transition of (Fe,Mn)2(P,Si,B) compounds. Across the transition, apart from a change in lattice parameters across the transition, the internal coordinates of Mn and Fe also change. This intrinsic degree of freedom...
journal article 2017
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Nguyên, V.T. (author), van Dijk, N. (author), Brück, E.H. (author)
The influence of Co (Ni) and B co-doping on the structural, magnetic and magnetocaloric properties of (Mn,Fe)<sub>2</sub>(P,Si) compounds is investigated by X-ray diffraction (XRD), differential scanning calorimetry, magnetic and direct temperature change measurements. It is found that Co (Ni) and B co-doping is an effective approach to tune...
journal article 2017
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Brück, E.H. (author), Yibole, Hargen (author), Zhang, L. (author)
After almost 20 years of intensive research on magnetocaloric effects near room temperature, magnetic refrigeration with first-order magnetocaloric materials has come close to real-life applications. Many materials have been discussed as potential candidates to be used in multicaloric devices. However, phase transitions in ferroic materials...
journal article 2016
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Miao, X.F. (author)
Mn-Fe-P-Si compounds are, to date, the most promising materials for refrigeration and energy conversion applications due to the combination of giant magnetocaloric effect (GMCE) and low material cost. The nature of magneto-elastic transition was studied on both length- and time-scales using neutron diffraction, muSR and Mӧssbauer spectroscopy...
doctoral thesis 2016
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Miao, X.F. (author), Caron, L. (author), Gubbens, P.C.M. (author), Yaouanc, A (author), Dalmas de Réotier, P (author), Luetkens, H. (author), Amato, A (author), van Dijk, N.H. (author), Brück, E.H. (author)
The longitudinal-field muon-spin relaxation (LF-μSR) technique was employed to study the spin correlations in (Mn,Fe)2(P,Si) compounds above the ferromagnetic transition temperature (TC). The (Mn,Fe)2(P,Si) compound under study is found to show itinerant magnetism. The standard deviation of the magnetic field distribution of electronic origin...
journal article 2016
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Yibole
This thesis reports on advanced characterizations of giant magnetocaloric materials that show a first order magnetic phase transition (FOMT). The results are of great interest not only for the design of new magnetic refrigerants, but also for a better understanding of the FOMT. This thesis paves the way for further developments and understanding...
doctoral thesis 2016
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Thang, N. V. (author), van Dijk, N.H. (author), Brück, E.H. (author)
The influence of the milling conditions on the nano-scale MnFe(P,Si) particles obtained by surfactant-assisted high-energy ball milling has been investigated by X-ray diffraction (XRD) and magnetic measurements. The presence of surfactant oleic acid prevents the re-welding of crushed particles and enhances the dispersion of nanoparticles in...
journal article 2015
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Guillou, F. (author), Porcari, G. (author), Yibole, H. (author), Van Dijk, N.H. (author), Brück, E. (author)
Large magnetically driven temperature changes are observed in MnFe(P,Si,B) materials simultaneously with large entropy changes, limited (thermal or magnetic) hysteresis, and good mechanical stability. The partial substitution of B for P in MnFe(P,Si) compounds is found to be an ideal parameter to control the latent heat observed at the Curie...
journal article 2014
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Vieira Leitão, J.C. (author)
The magnetocaloric effect (MCE) consists, in simple terms, in the heating of a magnetic material by the application of an external magnetic field. This can be easily understood if one but imagines a magnetic material with randomly applied spins; as a magnetic field is applied the spins will tend to alight with this field and as a result the...
doctoral thesis 2014
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Caron, L. (author), Miao, X.F. (author), Klaasse, J.C.P. (author), Gama, S. (author), Brück, E. (author)
Structural, magnetic, and magnetocaloric properties of Mn2-xCrxSb compounds have been studied. In these compounds, a first order magnetic phase transition from the ferrimagnetic to the antiferromagnetic state occurs with decreasing temperature, giving rise to giant inverse magnetocaloric effects that can be tuned over a wide temperature interval...
journal article 2013
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Porcari, G. (author), Buzzi, M. (author), Cugini, F. (author), Pellicelli, R. (author), Pernechele, C. (author), Caron, L. (author), Brück, E. (author), Solzi, M. (author)
n experimental setup for the direct measurement of the magnetocaloric effect capable of simulating high frequency magnetothermal cycles on laboratory-scale samples is described. The study of the magnetocaloric properties of working materials under operative conditions is fundamental for the development of innovative devices. Frequency and time...
journal article 2013
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Ou, Z.Q. (author)
This thesis presents a study of the crystal and magnetic structure, the magnetocaloric effect and related physical properties in Mn-Fe-P-X compounds. The influences of boron addition in (Mn,Fe)2(P,As) compounds have been studied. It is found that boron atoms occupy interstitial sites within the basal plane. First order magnetoelastic phase...
doctoral thesis 2013
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Nguyen, H.D. (author)
Limited resources and the wish for improved prosperity call for efficient use of energy. The UN Advisory Group on Energy and Climate Change recommends a target of 40 % improved efficiency by 2030. Materials research can contribute significantly to reach this target. Magnetic refrigeration offers potential to achieve a 50 % higher energy...
doctoral thesis 2012
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Dung, N.H. (author), Zhang, L. (author), Ou, Z.Q. (author), Zhao, L. (author), Van Eijck, L. (author), Mulders, A.M. (author), Avdeev, M. (author), Suard, E. (author), Van Dijk, N.H. (author), Brück, E. (author)
Using high-resolution neutron diffraction measurements for Mn-rich hexagonal Mn-Fe-P-Si compounds, we show that the substitution of Mn for Fe on the 3f sites results in a linear decrease of the Fe/Mn(3f) magnetic moments, while the Mn(3g) magnetic moments remain constant. With increasing temperature, the Mn(3g) magnetic moments show almost no...
journal article 2012
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Brück, E. (author), Trung, N.T. (author), Ou, Z.Q. (author), Buschow, K.H.J. (author)
The effect of Co and Ni substitutions for Fe on the magnetocaloric properties of MnFe(P,Ge) compounds crystallizing in the hexagonal Fe2P type of structure was studied. It was found that, by changing composition, a small thermal hysteresis and a giant magnetocaloric effect can be obtained simultaneously in MnFe(P,Ge) compounds when the magnetic...
journal article 2012
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Dung, N.H. (author), Zhang, L. (author), Ou, Z.Q. (author), Brück, E. (author)
We report on structural, magnetic, and magnetocaloric properties of MnxFe1.95?xP0.50Si0.50 (x???1.10) compounds. With increasing the Mn:Fe ratio, a first-order magneto-elastic transition gradually changes into a first-order magneto-structural transition via a second-order magnetic transition. The study also shows that thermal hysteresis can be...
journal article 2011
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Nguyen, T.T. (author)
Modern society relies on cooling technology for food safety, comfort and medical applications. The solid-state cooling technology known as magnetic refrigeration is one of the most promising techniques to replace the current vapor-compression cooling technology. To date, the search for suitable materials with a large magnetocaloric effect (MCE)...
doctoral thesis 2010
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Trung, N.T. (author), Biharie, V. (author), Zhang, L. (author), Caron, L. (author), Buschow, K.H.J. (author), Brück, E.H. (author)
Substitution of some Cr for Mn atoms in MnCoGe was employed to control the magnetic and structural transitions in this alloy to coincide, leading to a single first-order magnetostructural transition from the ferromagnetic to the paramagnetic state with a giant magnetocaloric effect observed near room temperature. Further increase in the Cr...
journal article 2010
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Trung, N.T. (author), Ou, Z.Q. (author), Gortenmulder, T.J. (author), Tegus, O. (author), Buschow, K.H.J. (author), Brück, E. (author)
Structural, magnetic, and magnetocaloric properties of the MnFe(P,Ge) compounds were systematically studied on both bulk alloys and melt-spun ribbons. The experimental results show that the critical behavior of the phase transition can be controlled by changing either the compositions or the annealing conditions. The thermal hysteresis is found...
journal article 2009
Searched for: subject:"Magnetocaloric"
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