Magnetic phase transition and magnetocaloric properties of Mn1-xSn CoGe alloys

Si, Xiaodong; Zhou, Keyi; Zhang, Rui; Liu, Yongsheng

doi:10.1016/j.physleta.2017.02.046

Cited by 18 publications

(3 citation statements)

References 40 publications

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“…S7 in ESI. According to the Banerjee criterion, the positive slope of μ 0 H/M vs. M 2 indicates a presence of second order magnetic phase transition 39,40 . The parameters A(T) and B(T) obtained from the linear region of the Arrott plots are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange

Zeleňák

Almáši

Zeleňáková

et al. 2019

Sci Rep

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Magnetic properties of three variants of MOF-76(Gd), {[Gd(BTC)(H2O)]·G}n (BTC = benzene-1,3,5-tricarboxylate, G = guest molecules) were investigated by static susceptibility, isothermal magnetization and specific heat capacity measurements. In the study we used as synthesized MOF-76(Gd)-DMF (1) (G = DMF = dimethylformamide), containing DMF molecules in the cavity system, compound MOF-76(Gd) (2), activated complex without solvents in the cavities and water exchanged sample MOF-76(Gd)-H2O (3). A pronounced change in the magnetic entropy was found near the critical temperature for all three compounds. It was shown, that magnetic entropy change depends on the solvatation of the MOF. The highest value entropy change, ΔSMpk(T) was observed for compound 2 (ΔSMpk(T) = 42 J kg−1 K−1 at 1.8 K for ΔH = 5 T). The ΔSMpk(T) for the compounds 1, 2 and 3 reached 81.8, 88.4 and 100% of the theoretical values, respectively. This suggests that in compound 3 Gd3+···Gd3+ antiferromagnetic interactions are decoupled gradually, and higher fields promote a larger decoupling between the individual spin centers. The observed entropy changes of compounds were comparable with other magnetic refrigerants proposed for low-temperature applications. To study the magnetothermal effect of 2 (the sample with largest −ΔSMpk), the temperature-dependent heat capacities (C) at different fields were measured. The value of magnetic entropy S obtained from heat capacities (39.5 J kg−1 K−1 at 1.8 K for an applied magnetic field change of 5 T) was in good agreement with that derived from the magnetization data (42 J kg−1 K−1 at 1.8 K).

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Section: Resultsmentioning

confidence: 99%

Large and tunable magnetocaloric effect in gadolinium-organic framework: tuning by solvent exchange

Zeleňák

Almáši

Zeleňáková

et al. 2019

Sci Rep

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“…Further investigation of magnetic properties and the determination of magnetic transition type was performed employing well established Arrott plot analysis. 9,10,25,26 The plots were constructed from the isothermal magnetization data as a function of magnetic field from 0 to 5 T for each corresponding sample, Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

“…[25][26][27][28] According to Landau theory, a theoretical modeling of the MCE could also provide the proof of characteristics typical of magnetic transition. The Gibbs free energy can be expressed as 25 where A(T) and B(T) parameters are temperature dependent representing the electron condensation energy and magnetoelastic coupling. Assuming the condition of equilibrium we obtain 26…”

Section: Resultsmentioning

confidence: 99%

Controlling of magnetocaloric effect in Gd2O3@SiO2 nanocomposites by substrate dimensionality and particles’ concentration

et al. 2017

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The magnetocaloric effect (MCE) of hybrid nanostructures consisting of fine gadolinium oxide (Gd2O3) nanoparticles with diameter 7 nm and 12 nm loaded into the pores of the periodically ordered mesoporous silica with hexagonal (SBA-15) or cubic (SBA-16) symmetry were investigated. The concentration effect of the added nanoparticles (NPs) and the effect of the silica matrix dimensionality on the structural properties, magnetization M(H), magnetic entropy change ΔSM, and parameters A(T) and B(T) derived from Arrott plots were studied in four samples. Examined nanocomposites exhibited reasonable high values of magnetic entropy change ΔSM varying from 29 J/kgK established for Gd2O3@SBA-15 up to 64 J/kgK observed in Gd2O3@SBA-16 at maximal field change 5 T at low temperatures. This suggests that studied nanocomposites, where diamagnetic silica matrices serve as nanoreactors for growth of Gd2O3 nanoparticles and their symmetry strongly affect magnetic properties of whole composites, could be feasible for cryomagnetic refrigeration applications.

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