التفاصيل البيبلوغرافية
| العنوان: |
Gadolinium-oxide nanoparticles for cryogenic magnetocaloric applications. |
| المؤلفون: |
Zeleňáková, A., Hrubovčák, P., Berkutova, A., Šofranko, O., Kučerka, N., Ivankov, O., Kuklin, A., Girman, V., Zeleňák, V. |
| المصدر: |
Scientific Reports; 2/10/2022, Vol. 12 Issue 1, p1-11, 11p |
| مصطلحات موضوعية: |
SMALL-angle neutron scattering, NANOCOMPOSITE materials, MAGNETIC entropy, SMALL-angle scattering, MAGNETIC transitions, NANOPARTICLES |
| مستخلص: |
The series of advanced nanocomposites consisting of Gd2O3 nanoparticles (NPs) embedded into periodic porous SiO2 matrix have been investigated with respect to their structural and magnetocaloric properties. By means of small angle neutron scattering and transmission electron microscopy, regular nanopores organized in the cubic or hexagonal superlattice have been documented. The pores are occupied by the NPs of progressive concentration within the nanocomposite series. All of the examined systems have exhibited extraordinarily high values of magnetic entropy change (up to 70 J kg−1 K−1) at low temperatures with the absence of thermal hysteresis, indicating their perspective utilization in cryogenic refrigeration. Profound analysis of magnetic entropy change data via scaling laws has been applied to the nanocomposite materials for the very first time. With the aid of scaling analysis, conclusions on magnetic properties and phase transition type have been made, even for the conditions unavailable in the laboratory. [ABSTRACT FROM AUTHOR] |
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