Relevant bibliographies by topics / Magnetocaloric effect

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Magnetocaloric effect'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2025

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Journal articles on the topic "Magnetocaloric effect"

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Zarkevich, Nikolai A., and Vladimir I. Zverev. "Viable Materials with a Giant Magnetocaloric Effect." Crystals 10, no. 9 (September 15, 2020): 815. http://dx.doi.org/10.3390/cryst10090815.

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This review of the current state of magnetocalorics is focused on materials exhibiting a giant magnetocaloric response near room temperature. To be economically viable for industrial applications and mass production, materials should have desired useful properties at a reasonable cost and should be safe for humans and the environment during manufacturing, handling, operational use, and after disposal. The discovery of novel materials is followed by a gradual improvement of properties by compositional adjustment and thermal or mechanical treatment. Consequently, with time, good materials become inferior to the best. There are several known classes of inexpensive materials with a giant magnetocaloric effect, and the search continues.
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Gomes, M. B., N. A. de Oliveira, P. J. von Ranke, and A. Troper. "Magnetocaloric effect in." Journal of Magnetism and Magnetic Materials 321, no. 24 (December 2009): 4006–9. http://dx.doi.org/10.1016/j.jmmm.2009.07.071.

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Reis, M. S. "Oscillating magnetocaloric effect." Applied Physics Letters 99, no. 5 (August 2011): 052511. http://dx.doi.org/10.1063/1.3615296.

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Gomes, M. B., and N. A. de Oliveira. "Magnetocaloric effect in." Journal of Magnetism and Magnetic Materials 301, no. 2 (June 2006): 503–12. http://dx.doi.org/10.1016/j.jmmm.2005.07.028.

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de Oliveira, N. A. "Magnetocaloric effect in." Journal of Magnetism and Magnetic Materials 320, no. 14 (July 2008): e150-e152. http://dx.doi.org/10.1016/j.jmmm.2008.02.037.

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Taskaev, Sergey, Konstantin Skokov, Dmitriy Karpenkov, Vladimir V. Khovaylo, Vasiliy D. Buchelnikov, D. A. Zherebtsov, Maxim Ulyanov, Dmitriy Bataev, Anatoliy Pellenen, and Alfiya Fazlitdinova. "The Influence of Cold Rolling on Magnetocaloric Properties of Gd100-xYx (x = 0, 5, 10, 15) Alloys." Solid State Phenomena 233-234 (July 2015): 238–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.238.

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In this work we report the results of investigation of the magnetocaloric effect in Gd100-xYx (x= 0, 5, 10, 15) cold rolled ribbons. It is shown that the magnetocaloric effect exists within a wide temperature interval 258-295 K and it is comparable with the magnetocaloric effect observed in bulk samples of pure gadolinium. The value of the magnetocaloric effect in the rolled samples is reduced in comparison with the bulk samples and strongly depends on a degree of plastic deformation. High temperature heat treatment can restore a value of the magnetocaloric effect in the cold rolled ribbons up to initial ones. Thus, cold rolling is proposed to be a promising technique for producing thin forms of magnetocaloric materials for heat exchangers of magnetic cooling devices.
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Dvoreckaia E. V., Sidorov V. L., Koplak O. V., Korolev D. V., Piskorsky V. P., Valeev R. A., and Morgunov R. B. "Magnetocaloric effect in amorphous-crystalline microcircuits PrDyFeCoB." Physics of the Solid State 64, no. 8 (2022): 989. http://dx.doi.org/10.21883/pss.2022.08.54615.373.

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In amorphous-crystalline PrDyFeCoB microconductors obtained by ultrafast melt cooling, a negative magnetocaloric effect was detected at 200-250 K (with heat release when the magnetic field is turned on), as well as a positive magnetocaloric effect in the temperature range of 300-340 K (with heat absorption when the magnetic field is turned on). It is established that there are no phase transitions of the first kind in the studied temperature range, which indicates that both of the detected effects are associated with a change in the magnetic part of the entropy. The transition at 200-250 K is due to the presence of metamagnetic states induced by a magnetic field in the spin-glass state of the amorphous part of the PrDyFeCoB alloy, and with their transition to the ferrimagnetic state. The transition at 300-340 K is spin-reorientation, and it occurs in crystalline inclusions identified in the amorphous matrix. Keywords: spin-reorientation transition, spin glass, magnetocaloric effect, entropy. Keywords: spin-reorientation transition, spin glass, magnetocaloric effect, entropy.
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Taskaev, Sergey, Konstantin Skokov, Dmitriy Karpenkov, Vladimir V. Khovaylo, Vasiliy D. Buchelnikov, D. A. Zherebtsov, Maxim Ulyanov, Dmitry Bataev, Damir Galimov, and Anatoliy Pellenen. "Magnetocaloric Properties of Cold Rolled Gd100-xZrx (x = 0, 1, 2, 3) Intermetallic Alloys." Solid State Phenomena 233-234 (July 2015): 220–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.220.

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In this work we report the results of experimental investigation of the magnetocaloric effect in Gd100-xZrx(x= 0, 1, 2, 3) cold rolled ribbons. As it is shown the magnetocaloric effect exist within the large temperature interval 279-295 K and comparable with magnetocaloric effect observed on pure Gd. As it shown cold rolling is one of promising techniques for producing thin forms of magnetocaloric materials for heat exchangers of magnetic cooling devices.
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Zvyagin, A. A., and G. A. Zvyagina. "Magnetocaloric effect in UTe2: Theory predictions." Low Temperature Physics 50, no. 7 (July 1, 2024): 549–57. http://dx.doi.org/10.1063/10.0026281.

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Two simple effective models for the low-temperature (however higher than the temperature of the transition to the superconducting phase) behavior of magnetic and magnetocaloric characteristics in the external magnetic field in UTe2 are proposed. The models are based on the dual nature of 5f electrons and take into account both itinerant electrons and localized electrons of U ions. Several magnetic characteristics including the magnetocaloric ones have been calculated for those scenarios. It is expected that by observing the features of the characteristics of the magnetocaloric effect in UTe2 and comparing them with the ones, predicted by the theory, one can choose the model, that can better describe the specific magnetic properties of UTe2 at low temperatures in the normal phase.
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Hamad, Mahmoud. "Magnetocaloric properties of La0.666Sr0.373Mn0.943Cu0.018O3." Processing and Application of Ceramics 11, no. 3 (2017): 225–28. http://dx.doi.org/10.2298/pac1703225h.

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Magnetocaloric properties of La0.666Sr0.373Mn0.943Cu0.018O3 (LSMCO) perovskite (such as magnetic entropy change, full-width at half-maximum, relative cooling power and magnetic specific heat change) at applied magnetic field of 0.05 T were calculated using the phenomenological model. The results indicate the prospective application of LSMCO due to high magnetocaloric effect near the Curie temperature. Furthermore, the magnetocaloric properties of LSMCO sample are comparable with magnetocaloric properties of MnAs film, La1-xCdxMnO3 and La1.25Sr0.75MnCoO6, and significantly larger than that of Gd1-xCaxBaCo2O5.5 and Ge0.95Mn0.05. It is recommended that magnetocaloric effect of LSMCO can be used as a promising practical material of an apparatus based on the active magnetic regenerator cycle.
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Dissertations / Theses on the topic "Magnetocaloric effect"

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Sandberg, Anna. "Quantum statistics and the magnetocaloric effect." Thesis, Uppsala universitet, Materialteori, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415830.

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Caloric materials show prospect in replacing the function of vaporcompression systems in todays cooling devices, resulting in more energy efficient cooling and eliminating the need for refrigerents which contribute to climate change. This project has focused on magnetocaloric materials, which experience changes in temperature when exposed to magnetic fields. A step to finding viable materials is developing realistic simulations. To this end, this project has investigated if the calculated magnetocaloric effect is impacted by the choice of statistic. Three systems have been studied, bcc Fe, FeRh and Fe2P, using Monte Carlo simulations. The results have shown differences in the calculated entropy change depending on the statistic of choice. The quantum statistics have shown a ∆S = 0 below the phase transition, unlike the classical statistics. At the phase tranisitions quantum statistics resulted in either similar or smaller values for the calculated change in entropy.
Kaloriska material har potential att i framtiden ersätta funktionen hos ångkomprimeringssystem i dagens kylapparater, vilket i sin tur kan leda till mer energieffektiv kylning samt eliminerar behovet av kylmedier som bidrar till klimatförändringen. I detta projekt ligger fokus på magnetokaloriska material, vilka erfar temperaturförändringar då de utsätts för magnetfält. Ett steg mot att hitta gångbara material är att utveckla realistiska simulationer. För detta ändamål undersöktes huruvida den beräknade magnetokaloriska effekten påverkas av valet av statistik. Tre system studerades, bcc Fe, FeRh samt Fe2P, med hjälp av Monte Carlo simulationer. Resultaten visade skillnader i den beräknade entropiförändringen beroende på valet av statistik. För kvantstatistiken var  ∆S = 0 för temperaturer under fasövergångerna, vilket skiljde sig från de klassiska resultaten. Vid fasövergångarna gav kvantstatistiken liknande eller mindre värden för den beräknade entropiförändringen.
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Rebar, Drew. "Magnetocaloric effect in nanoparticles and bulk clathrates." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001630.

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Bauer, Christopher. "Magnetocaloric Effect in Thin Films and Heterostructures." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3003.

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The goals of this work are the optimization of the magnetocaloric effect in Gadolinium thin film structures. We approach this issue from two directions, that of process optimization and of interface effects. Past results showed Gd2O3 in our Gadolinium thin films, and the presence of such oxide seemed to grow with the temperature at which the film was grown or annealed. Comparison of samples grown without chamber gettering to those that were gettered show differences in their structural and magnetic properties, and we conclude that gettering is an effective step in enhancing the quality of Gd thin film samples. Early work with Gd/W heterostructures showed a diminished magnetization of the interfacial gadolinium, which reduces the magnetocaloric response as magnetic entropy is proportional to m2/3. It is known that Fe interfaces can boost the Gd moments per atom to above that seen in bulk. As such, we fabricated a series of Fe/Gd heterostructures to study the effects on the structural and magnetic properties of Gd thin films. The use of Fe as a base layer shows increased high frequency oscillations in X-ray reflectivity measurements, indicating sharp interfaces between Gd and Fe. The magnetocaloric measurements produce a magnetic entropy curve with a novel tail extending leftward, making this an improved material over Gd for applications around 240K. All the same, vector magnetometry is needed to ensure that such tail is not due to rotations within the plane and is a direction for further study.
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Bayer, Daniel Nicholas. "The Magnetocaloric Effect & Performance of Magnetocaloric Materials in a 1D Active Magnetic Regenerator Simulation." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578587695272946.

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Ghorbani-Zavareh, Mahdiyeh. "Direct Measurements of the Magnetocaloric Effect in Pulsed Magnetic Fields." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-207504.

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The present thesis is devoted to the investigation of the magnetocaloric effect (MCE) by direct measurements in pulsed and quasi-static magnetic fields as well as by analyzing specific-heat data taken in static magnetic fields. The emphasis is on the direct measurement of the adiabatic temperature change Tad in pulsed magnetic fields, because the pulsed-field data allow for an analysis of the sample-temperature response to the magnetic field on a time scale of 10 to 100 ms, which is on the order of typical operation frequencies (10 - 100 Hz) of magnetocaloric cooling devices. Besides extending the accessible magneticfield range to beyond 70 T, the short pulse duration provides nearly adiabatic conditions during the measurement. In this work, the magnetocaloric properties of various types of solids are investigated: Gadolinium (Gd) with a second-order transition, Ni50Mn35In15 with multiple magnetic transitions, and La(Fe,Si,Co)13 compounds with first and second-order transitions, depending on the Co concentration. The adiabatic temperature change of a polycrystalline Gd sample has been measured in pulsed magnetic fields up to 70 T and also in quasi-static fields up to 2 T. A very large adiabatic temperature change of Tad 60 K is observed near the Curie temperature (TC = 294 K) for a field change of 70 T. In addition, we find that this maximum temperature change grows with H2=3. We have studied the MCE in the shape-memory Heusler alloy Ni50Mn35In15 by direct measurements in pulsed magnetic fields up to 6 and 20 T. The results obtained for 6 T pulses are compared with data extracted from specific-heat experiments. We find a saturation of the inverse MCE, related to the firstorder martensitic transition, with a maximum adiabatic temperature change of Tad = 7 K at 250 K and a conventional field-dependent MCE near the second-order ferromagnetic transition in the austenitic phase. Our results disclose that in shape-memory alloys the different contributions to the MCE and hysteresis effects around the martensitic transition have to be carefully considered for future cooling applications. Finally, a comparative study of the magnetic and magnetocaloric properties of La(Fe,Si,Co)13 alloys is presented by discussing magnetization, Tad, specificheat, and magnetostriction measurements. The nature of the transition can be changed from first to second order as well as the temperature of the transition can be tuned by varying the Co concentration. The MCE of two samples with nominal compositions of LaFe11:74Co0:13Si1:13 and LaFe11:21Co0:65Si1:11 have been measured in pulsed magnetic fields up to 50 T. We find that LaFe11:74Co0:13Si1:13 with a first-order transition (TC = 198 K) shows half of the net MCE already at low fields (2-10 T). Whereas the MCE of LaFe11:21Co0:65Si1:11 with secondorder transition (TC = 257 K) grows gradually. The MCE in both compounds reaches almost similar values at a field of 50 T. The MCE results obtained in pulsed magnetic fields of 2 T are in good agreement with data from quasistatic field measurements. The pulsed-field magnetization of both compounds has been measured in fields up to 60 T under nearly adiabatic conditions and compared to steady-field isothermal measurements. The differences between the magnetization curves obtained under isothermal and adiabatic conditions give the MCE via the crossing points of the adiabatic curve with the set of isothermal curves. For LaFe11:74Co0:13Si1:13, a S - T diagram has been constructed from specific-heat measurements in static fields, which is used to extract the MCE indirectly. Magnetostriction measurements are carried out for two compounds in both static and pulsed magnetic fields. For LaFe11:74Co0:13Si1:13, the strain shows a sharp increase. However, due to cracks appearing in the sample an irreversible magneto-volume effect of about 1% is observed in pulsed magnetic fields. Whereas for LaFe11:21Co0:65Si1:11 the data show a smooth increase of the sample length up to 60 T, and a 1.3% volume increase is obtained. We also find that magnetizing the latter sample in the paramagnetic state is tightly bound to the volume increase and this, likewise for the former sample, gives the main contribution to the entropy change.
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Casanova, i. Fernàndez Fèlix. "Magnetocaloric Effect In Gd5(SixGe1-x)4 Alloys." Doctoral thesis, Universitat de Barcelona, 2004. http://hdl.handle.net/10803/1789.

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This Ph.D. Thesis has been devoted to the preparation and characterisation of bulk Gd5(SixGe1-x)4 alloys and to the study of the magnetocaloric effect at the first-order magnetostructural transition appearing in these compounds. We summarise the most relevant results from this research:

- Bulk Gd5(SixGe1-x)4 samples with 0¡Âx ¡Â0.5 have been prepared by using our home-made arc-melting furnace. Characterisation techniques (SEM, microprobe, XRD, DSC, magnetisation, ac susceptibility) show that the 5:4 phase with the desired x is obtained. Some spread around the nominal value and secondary 5:3 and 1:1 phases are detected. Heat treatment favour the segregation of these secondary phases, but also reduce the spread in the x value. A treatment at 920 ¨¬C for 4 hours in a 10-5 mb vacuum furnace enables a trade-off between phase segregation and removal of x spread.

- A new differential scanning calorimeter (DSC), which operates under applied magnetic fields of up to 5 T and within the temperature range 10-300 K, has been developed. This calorimeter enables an accurate determination of the entropy change associated with a magnetostructural phase transition. The transition can be induced by sweeping either T or H.

- It has been shown that the Clausius-Clapeyron equation and DSC measurements yield the entropy change associated with the first-order magnetostructural transition, ∆S. If the Maxwell relation is evaluated only within the field range over which the transition takes place, the same value is obtained. When the Maxwell relation is evaluated over the whole field range, the T and H dependences of the magnetisation in each phase outside the transition region yield an additional entropy change to that associated with that of the actual first-order transition. The transition temperature Tt must significantly shift with the applied field, in order to achieve a large MCE taking advantage of ∆S.

- DSC under H has been used to measure ∆S for Gd5(SixGe1-x)4, x ¡Â0.5. ∆S scales with Tt, which is a direct consequence of the fact that Tt is tuned by x and H and it is thus expected to be universal for any material showing a field-induced transition. The specific shape of ∆S vs. Tt will depend on the details of the phase diagram, Tt(x). The scaling of ∆S shows the equivalence of magnetovolume and substitution-related effects in Gd5(SixGe1-x)4 alloys.

- The variation of the transition field with the transition temperature, dHt/dTt, has been studied in Gd5(SixGe1-x)4 for 0¡Âx ¡Â0.5. It is shown that dHt/dTt governs the scaling of ∆S with Tt. Two distinct behaviours for dHt/dTt have been found on the two compositional ranges where the magnetostructural transition occurs, showing the difference in the strength of the magnetoelastic coupling in this system.

- It has been shown that an unreported field-induced magnetic phase transition exists from the AFM phase to a phase which presents short-range correlations (SRAFM). The results suggest that the transition results from the breaking of the long-range AFM correlations when a magnetic field is applied, which leads to competing FM and AFM short-range correlations. FM correlations are also relevant in the whole long-range AFM phase. The expected transition from the SRAFM to the PM phase takes place at ~240 K at zero field, being widened and smoothed under applied field. This finding in the Ge-rich Gd5(SixGe1-x)4 alloys arises from the competition between the intraslab FM interactions and the interslab AFM interactions.

- The dynamics of the first-order transition in Gd5(SixGe1-x)4 alloys has been studied by cycling virgin samples. The field-induced entropy change increases during the first cycles, then reaching a stationary value. This behaviour is related to the avalanche distribution, which also evolves with cycling. The structure of avalanches becomes repetitive after a few cycles tending towards a power-law distribution, unveiling the athermal character of the transition.
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Turcaud, Jeremy. "Magnetocaloric effect and thermal transport management in lanthanum manganites." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/40889.

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This thesis investigates two challenges associated with the use of manganites for magnetocaloric applications. The first challenge is associated with methods to engineer the thermal conductivity, K. The second challenge is to understand the limits of the entropy change achievable in magnetocaloric manganites. Thermal management has been achieved via different microstructuring routes and their influence on thermal transport properties such as K, resistivity and thermopower, have been studied. A factor of two increase in K is demonstrated by using density and grain size optimization, while three-fold and six-fold increases are seen by employing the introduction of a second highly conductive phase via: (1) silver impregnation and silver particle coating and (2) copper electroplating, respectively. Understanding the magnetocaloric effect (MCE) characteristics in manganites has been achieved by bringing together magnetisation, magneto-structural, magneto-Seebeck, and neutron diffraction independent measurements. We first show that the temperature T* up to which a spontaneous magnetisation is observed in the inverse magnetic susceptibility of La0.7Ca0.3MnO3 and La0.7Ba0.3MnO3 above Tc, is related to the transition temperature of the low temperature (high-magnetic field and high-magnetisation) magnetic phase. In the most widely studied La(1-x)CaxMnO3 (x = 0.2, 0.25, 0.3), we then conclude that unlike between the degree of static Jahn-Teller distortion and the interval [T*-Tc]/Tc where we show that there exists a close relationship, there is no apparent correlation between the magnitude of the MCE and [T*-Tc]/Tc . We then unravel the competing strength of the various degrees of freedom and show that the inhibition of a large magnetocaloric response is due to the strong correlations that underpin the collosal magnetoresistance effect: both clustering of magnetic Mn atoms due to polaron formation and the insulator to metal transition. Finally we discuss prospects to improve material properties for application in light of these findings.
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Bratko, Milan. "The magnetocaloric effect at a first order phase transition." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/23653.

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The magnetocaloric effect (MCE) can be defined as the isothermal entropy change (or adiabatic temperature change) of a material upon application/removal of an external magnetic field and is the key physics for a magnetic cooling device. A discontinuity of entropy at a first order phase transition (FOPT) allows for a large entropy change to be induced by a relatively small field. However, a hysteresis is necessarily associated with a FOPT. The effects of hysteresis, as measured in a sensitive microcalorimeter, are the focus of the thesis. The calorimetric setup used is unique in allowing a separate measurement of heat capacity and latent heat and thereby the possibility to clearly distinguish the first and higher order contributions to MCE. Due to the high measurement fidelity required, the experimental chapter is a core component of the thesis and includes a thorough analysis of the measurement errors associated with the microcalorimeter. Several improvements are proposed to improve precision and accuracy of the measurement in future studies. The first of the hysteresis effects is a spurious 'colossal' MCE. Its indirect observation was claimed in 2004 from magnetisation measurements analysed using a Maxwell relation and was widely disputed thereafter. It was shown that a different measurement protocol leads to non 'colossal' MCE. This thesis investigates whether the 'colossal' MCE can be achieved by a particular magnetisation history by reproducing the original measurement protocol in a more direct calorimetric measurement. It is shown that the 'colossal' MCE is just an artefact of the use of Maxwell relation in a non-equilibrium process. The final chapter discusses a second effect of hysteresis: a subtle difference between the indirect and calorimetric measurements of MCE that can be clearly observed when comparing measurements on field application and removal. Maxwell relation leads to an artefact related to temperature dependence of the hysteresis. In the calorimetric measurement the dissipation of magnetic work in a hysteretic magnetisation cycle is observed.
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Quetz, Abdiel. "EXPLORATION OF NEW MAGNETOCALORIC AND MULTIFUNCTIONAL MAGNETIC MATERIALS." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/dissertations/1378.

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The magnetic properties of NiMnGe1−xAlx, Ni50Mn35(In1−xBx)15, Ni50Mn35In14.5B0.5 (Bulk, As-Solidified and Annealed melt-spun ribbon) and RE-Infuse Carbon Nanotubes, have been studied by x-ray diffraction, differential scanning calorimetry (DSC), and magnetization measurements. Partial substitution of Al for Ge in NiMnGe1−xAlx results in a first-order magnetostructural transition (MST) from a hexagonal ferromagnetic to an orthorhombic antiferromagnetic phase at 186 K (for x = 0.09). A large magnetic entropy change of ∆SM = -17.6 J/kg K for ∆H = 5 T was observed in the vicinity of TM = 186 K for x = 0.09. This value is comparable to those of well-known giant magnetocaloric materials, such as Gd5Si2Ge2, MnFeP0.45As0.55, and Ni50Mn37Sn13. The values of the latent heat (L = 6.6 J/g) and corresponding total entropy changes (∆ST = 35 J/kg K) have been evaluated for the MST using DSC measurements. Large negative values of ∆SM of -5.8 and -4.8 J/kg K for ∆H = 5 T and up to 9T in the vicinity of TC were observed for x = 0.09 and 0.085, respectively. The impact of B substitution in Ni50Mn35In15-xBx Heusler alloys on the structural, magnetic, transport, and parameters of the magnetocaloric effect (MCE) has been studied by means of room-temperature X-ray diffraction and thermomagnetic measurements (in magnetic fields (H) up to 5 T, and in the temperature interval 5-400 K ). Direct adiabatic temperature change (ΔTAD) measurements have been carried out for an applied magnetic field change of 1.8 T. The transition temperatures (T-x) phase diagram has been constructed for H = 0.005 T. The MCE parameters were found to be comparable to those observed in other MCE materials such as Ni50Mn34.8In14.2B and Ni50Mn35In14X (X=In, Al, and Ge) Heusler alloys. The maximum absolute value of ΔTAD = 2.5 K was observed at the magnetostructural transition for Ni50Mn35In14.5B0.5. The structural phase transition temperatures, phase structure, and parameters of the magnetocaloric effect (MCE) of Ni50Mn35In14.5B0.5 as Bulk, As-Solidified and Annealed melt-spun ribbon has been studied by means of room-temperature X-ray diffraction and thermomagnetic measurements (in magnetic fields (oH) up to 5 T, and in the temperature interval 5–400 K). Magnetic and structural transitions in Ni50Mn35In14.5B0.5 as ribbons were found to coincide in Ni50Mn35In14.5B0.5 bulk sample, leading to a large magnetocaloric effects associated with the first-order magnetostructural phase transition. In comparison to the bulk Ni50Mn35In14.5B0.5 alloys, both the martensitic transition temperature (TM) and Curie temperature (TC) shifted to lower temperatures. Magnetic measurements revealed that the ribbons undergo a structure transformation similar to the bulk material at the martensitic transformation. The temperature of the transformation depends strongly on lattice parameters of the ribbons. MST shows a weak broad magnetic transition at TCM∼ 160 K, while the Curie temperature of AST TCA is ∼ 297 K. The MCE parameters were found to be comparable to those observed in other MCE materials such as Ni50Mn34.8In14.2B and Ni50Mn35In14X (X = In, Al, and Ge) Heusler alloys. These results suggest the possibility to control the martensitic transition in Ni50Mn35In14.5B0.5 through rapid solidification process. A comparison of magnetic properties and magnetocaloric effects in Ni50Mn35In14.5B0.5 alloys as Bulk, As-Solidified and Annealed ribbons is discussed. Carbon nanotube (CNT)/metal-cluster-based composites are envisioned as new materials that possess unique electronic properties which may be utilized in a variety of future applications. Super paramagnetic behavior was reported for CNTs with Gd ions introduced into the CNT openings by internal loading with an aqueous GdCl3 chemical process. In the current work, the magnetic properties of the CNT/Gd composites were obtained by the joining and annealing of Gd metal and CNTs at 850 °C for 48 h. Energy dispersive X-ray analysis shows the presence of Gd intermingled with the CNT walls with maximum and average Gd concentrations of about 20% and 4% (by weight), respectively. The Gd clusters have a non-uniform distribution and are mostly concentrated at the ends of the CNTs. A ferromagnetic-type transition at TC ∼ 320 K, accompanied by jump like change in magnetization and temperature hysteresis typical for the temperature induced first order phase transitions has been observed by magnetization measurements. It was found that Gd infused into the CNTs by the annealing results in a first order paramagnetic-ferromagnetic transition at TC = 320 K.
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Barcza, Alexander. "The magnetocaloric effect and magnetoelastic interactions in CoMnSi-based alloys." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608462.

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Books on the topic "Magnetocaloric effect"

1

I, Spichkin Y., ed. The magnetocaloric effect and its applications. Bristol: Institute of Physics Pub., 2003.

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Tishin, A. M., and Y. I. Spichkin. Magnetocaloric Effect and Its Applications. Taylor & Francis Group, 2016.

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Gencer, H., V. S. Kolat, T. Izgi, N. Bayri, and S. Atalay. Magnetocaloric Effect in Perovskite Manganites. Materials Research Forum LLC, 2020.

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Tishin, A. M., and Y. I. Spichkin. Magnetocaloric Effect and Its Applications. Taylor & Francis Group, 2003.

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Tishin, A. M., and Y. I. Spichkin. Magnetocaloric Effect and Its Applications. Taylor & Francis Group, 2016.

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Nazmunnahar, Mst. Structural and Magnetic Characterization of Co50Mn30InxSn Samples for Magnetocaloric Effect. GRIN Verlag GmbH, 2013.

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GaoFeng, Wang. Magnetic and Calorimetric Study of the Magnetocaloric Effect in Intermetallics Exhibiting First-order Magnetostructural Transitions. Prensas de la Universidad de Zaragoza, 2012.

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Book chapters on the topic "Magnetocaloric effect"

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Sun, J. R., B. G. Shen, and F. X. Hu. "Magnetocaloric Effect and Materials." In Nanoscale Magnetic Materials and Applications, 441–83. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-85600-1_15.

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Sharples, Joseph W., and David Collison. "Lanthanides and the Magnetocaloric Effect." In Lanthanides and Actinides in Molecular Magnetism, 293–314. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527673476.ch9.

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Zimm, C. B., P. M. Ratzmann, J. A. Barclay, G. F. Green, and J. N. Chafe. "The Magnetocaloric Effect in Neodymium." In Advances in Cryogenic Engineering Materials, 763–68. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-9880-6_99.

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Pecharsky, V. K., and K. A. Gschneidner. "Magnetocaloric Effect Associated with Magnetostructural Transitions." In Magnetism and Structure in Functional Materials, 199–222. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-31631-0_11.

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Dan’kov, S. Yu, V. V. Ivtchenko, A. M. Tishin, K. A. Gschneidner, and V. K. Pecharsky. "Magnetocaloric Effect in GdAl2 and Nd2Fe17." In Advances in Cryogenic Engineering Materials, 397–404. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4293-3_51.

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Hutchison, W. D., J. L. Wang, and S. J. Campbell. "Magnetism and the magnetocaloric effect in PrMn1.6Fe0.4Ge2." In HFI / NQI 2012, 129–37. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-6479-8_21.

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Bessais, L., R. Guetari, R. Bez, K. Zehani, N. Mliki, and C. B. Cizmas. "Structure and magnetocaloric effect of Pr2Fe17-xAlx." In TMS 2014: 143rd Annual Meeting & Exhibition, 9–14. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48237-8_2.

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Bessais, L., R. Guetari, R. Bez, K. Zehani, N. Mliki, and C. B. Cizmas. "Structure and Magnetocaloric Effect of Pr2Fe17-xAlx." In TMS 2014 Supplemental Proceedings, 9–14. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118889879.ch2.

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Otowski, W., C. Glorieux, R. Hofman, and J. Thoen. "Acousto-Thermal Detection of the Magnetocaloric Effect." In Photoacoustic and Photothermal Phenomena III, 647–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-540-47269-8_166.

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Casanova, F., X. Batlle, A. Labarta, J. Marcos, E. Vives, L. Mañosa, and A. Planes. "Entropy Change and Magnetocaloric Effect in Magnetostructural Transformations." In Magnetism and Structure in Functional Materials, 223–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-31631-0_12.

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Conference papers on the topic "Magnetocaloric effect"

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Priyanka and Rinku Sharma. "Impact of pressure on the magnetocaloric effect in InSb quantum wire: Rashba SOI and crossed electromagnetic field." In Frontiers in Optics, JW4A.13. Washington, D.C.: Optica Publishing Group, 2024. https://doi.org/10.1364/fio.2024.jw4a.13.

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The impact of hydrostatic pressure on the magnetocaloric effect in an InSb quantum wire has been investigated. First, eigenenergies are obtained using the diagonalization method, then entropy and magnetic entropy (magnetocaloric effect) are calculated numerically.
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Goswami, Srikanta, P. D. Babu, and R. Rawat. "Magnetocaloric effect in Tb3Ni." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016679.

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Shun, R. D. "Magnetocaloric Effect Of Ferromagnetic Particles." In 1993 Digests of International Magnetics Conference. IEEE, 1993. http://dx.doi.org/10.1109/intmag.1993.642177.

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Mohapatra, Niharika, K. Mukherjee, K. K. Iyer, and E. V. Sampathkumaran. "Magnetoresistance and magnetocaloric effect in Er5Si3." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710423.

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Krishnamurthy, J., and A. Venimadhav. "Magnetocaloric effect in double pervoskite La2CoMnO6." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710458.

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Karmakar, S. K., and S. Majumdar. "Investigation of magnetocaloric effect in GdGa0.8Ge0.2." In DAE SOLID STATE PHYSICS SYMPOSIUM 2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4948127.

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Yako, H., T. Shima, and M. Doi. "Magnetocaloric effect in Pd2−xNixMn1.47Sn0.53 Heusler alloy." In 2017 IEEE International Magnetics Conference (INTERMAG). IEEE, 2017. http://dx.doi.org/10.1109/intmag.2017.8007733.

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Gupta, Sachin B., and K. G. Suresh. "Study of magnetocaloric effect in GdRhIn compound." In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791425.

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Nan, W., K. Kim, S. Yu, T. You, and B. Kang. "Magnetic properties and magnetocaloric effect studies for La0.6Ce0.4Fe11.5Si1.5." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156757.

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Balfour, E. A., Y. Shang, Y. Cao, H. Fu, A. A. El-Gendy, and R. L. Hadimani. "Table-like Magnetocaloric Effect in Ho36Co48Al16 Multiphase Alloy." In 2018 IEEE International Magnetic Conference (INTERMAG). IEEE, 2018. http://dx.doi.org/10.1109/intmag.2018.8508395.

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Reports on the topic "Magnetocaloric effect"

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Johra, Hicham. Performance overview of caloric heat pumps: magnetocaloric, elastocaloric, electrocaloric and barocaloric systems. Department of the Built Environment, Aalborg University, January 2022. http://dx.doi.org/10.54337/aau467469997.

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Heat pumps are an excellent solution to supply heating and cooling for indoor space conditioning and domestic hot water production. Conventional heat pumps are typically electrically driven and operate with a vapour-compression thermodynamic cycle of refrigerant fluid to transfer heat from a cold source to a warmer sink. This mature technology is cost-effective and achieves appreciable coefficients of performance (COP). The heat pump market demand is driven up by the urge to improve the energy efficiency of building heating systems coupled with the increase of global cooling needs for air-conditioning. Unfortunately, the refrigerants used in current conventional heat pumps can have a large greenhouse or ozone-depletion effect. Alternative gaseous refrigerants have been identified but they present some issues regarding toxicity, flammability, explosivity, low energy efficiency or high cost. However, several non-vapour-compression heat pump technologies have been invented and could be promising alternatives to conventional systems, with potential for higher COP and without the aforementioned refrigerant drawbacks. Among those, the systems based on the so-called “caloric effects” of solid-state refrigerants are gaining large attention. These caloric effects are characterized by a phase transition varying entropy in the material, resulting in a large adiabatic temperature change. This phase transition is induced by a variation of a specific external field applied to the solid refrigerant. Therefore, the magnetocaloric, elastocaloric, electrocaloric and barocaloric effects are adiabatic temperature changes in specific materials when varying the magnetic field, uniaxial mechanical stress, electrical field or hydrostatic pressure, respectively. Heat pump cycle can be built from these caloric effects and several heating/cooling prototypes were developed and tested over the last few decades. Although not a mature technology yet, some of these caloric systems are well suited to become new efficient and sustainable solutions for indoor space conditioning and domestic hot water production. This technical report (and the paper to which this report is supplementary materials) aims to raise awareness in the building community about these innovative caloric systems. It sheds some light on the recent progress in that field and compares the performance of caloric systems with that of conventional vapour-compression heat pumps for building applications.
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Niu, Xuejun. Magnetocaloric effect of Gd4(BixSb1-x)3 alloy series. Office of Scientific and Technical Information (OSTI), January 1999. http://dx.doi.org/10.2172/754836.

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Misra, Sumohan. Structural flexibility in magnetocaloric RE5T4 (RE=rare-earth; T=Si,Ge,Ga) materials: Effect of chemical substitution on structure, bonding and properties. Office of Scientific and Technical Information (OSTI), January 2008. http://dx.doi.org/10.2172/964391.

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Johra, Hicham. Performance overview of caloric heat pumps: magnetocaloric, elastocaloric, electrocaloric and barocaloric systems: Update 2024. Department of the Built Environment, Aalborg University, 2024. http://dx.doi.org/10.54337/aau747557298.

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The aim of this technical report is to give an overview of the performance of different heating and cooling caloric systems: magnetocaloric, elastocaloric, electrocaloric and barocaloric heat pumps. The performance of these innovative caloric heat pump systems is compared with that of conventional vapour-compression heat pumps. This overview is built upon experimental and numerical data collected from 160 scientific publications and technical reports. The present technical report is an update of previous supplementary materials for the article “Innovative heating and cooling systems based on caloric effects: A review” presented at the CLIMA 2022 conference (REHVA 14th HVAC World Congress. 22-25 May 2022, Rotterdam, The Netherlands). New entries from scientific publications have been added, and a few typos and interpretation mistakes have been corrected compared to the previous version of the supplementary materials.
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