Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and Theory
An experimental study of the rotational magnetocaloric effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>SO<sub>4</sub>∙2H<sub>2</sub>O (<i>en</i> = ethylenediamine) single crystal is presented. The study was carried out at tem...
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MDPI AG
2022-04-01
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| Series: | Magnetochemistry |
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| Online Access: | https://www.mdpi.com/2312-7481/8/4/39 |
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| author | Petro Danylchenko Róbert Tarasenko Erik Čižmár Vladimír Tkáč Alexander Feher Alžbeta Orendáčová Martin Orendáč |
| author_facet | Petro Danylchenko Róbert Tarasenko Erik Čižmár Vladimír Tkáč Alexander Feher Alžbeta Orendáčová Martin Orendáč |
| author_sort | Petro Danylchenko |
| collection | DOAJ |
| description | An experimental study of the rotational magnetocaloric effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>SO<sub>4</sub>∙2H<sub>2</sub>O (<i>en</i> = ethylenediamine) single crystal is presented. The study was carried out at temperatures above 2 K and was associated with adiabatic crystal rotation between the easy plane and hard axis in magnetic fields up to 7 T. The magnetocaloric properties of the studied system were investigated by isothermal magnetization measurement. The experimental observations were completed with ab initio calculations of the anisotropy parameters. A large rotational magnetic entropy change ≈12 Jkg<sup>−1</sup>K<sup>−1</sup> and ≈16.9 Jkg<sup>−1</sup>K<sup>−1</sup> was achieved in 5 T and 7 T, respectively. The present study suggests a possible application of this material in low-temperature refrigeration since the adiabatic rotation of the single crystal in 7 T led to a cooldown of the sample from the initial temperature of 4.2 K down to 0.34 K. Finally, theoretical calculations show that <i>S</i> = 1 Ni(II)-based systems with easy-plane anisotropy can have better rotational magnetocaloric properties than costly materials containing rare-earth elements in their chemical structures. |
| first_indexed | 2024-03-09T10:32:37Z |
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| institution | Directory Open Access Journal |
| issn | 2312-7481 |
| language | English |
| last_indexed | 2024-03-09T10:32:37Z |
| publishDate | 2022-04-01 |
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| record_format | Article |
| series | Magnetochemistry |
| spelling | doaj.art-f8bae8daeff5482ca9571a4293bef9a52023-12-01T21:10:46ZengMDPI AGMagnetochemistry2312-74812022-04-01843910.3390/magnetochemistry8040039Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and TheoryPetro Danylchenko0Róbert Tarasenko1Erik Čižmár2Vladimír Tkáč3Alexander Feher4Alžbeta Orendáčová5Martin Orendáč6Institute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 041 54 Košice, SlovakiaInstitute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 041 54 Košice, SlovakiaInstitute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 041 54 Košice, SlovakiaInstitute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 041 54 Košice, SlovakiaInstitute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 041 54 Košice, SlovakiaInstitute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 041 54 Košice, SlovakiaInstitute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 041 54 Košice, SlovakiaAn experimental study of the rotational magnetocaloric effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>SO<sub>4</sub>∙2H<sub>2</sub>O (<i>en</i> = ethylenediamine) single crystal is presented. The study was carried out at temperatures above 2 K and was associated with adiabatic crystal rotation between the easy plane and hard axis in magnetic fields up to 7 T. The magnetocaloric properties of the studied system were investigated by isothermal magnetization measurement. The experimental observations were completed with ab initio calculations of the anisotropy parameters. A large rotational magnetic entropy change ≈12 Jkg<sup>−1</sup>K<sup>−1</sup> and ≈16.9 Jkg<sup>−1</sup>K<sup>−1</sup> was achieved in 5 T and 7 T, respectively. The present study suggests a possible application of this material in low-temperature refrigeration since the adiabatic rotation of the single crystal in 7 T led to a cooldown of the sample from the initial temperature of 4.2 K down to 0.34 K. Finally, theoretical calculations show that <i>S</i> = 1 Ni(II)-based systems with easy-plane anisotropy can have better rotational magnetocaloric properties than costly materials containing rare-earth elements in their chemical structures.https://www.mdpi.com/2312-7481/8/4/39rotational magnetocaloric effectentropyadiabatic temperature changemagnetic anisotropycrystal field |
| spellingShingle | Petro Danylchenko Róbert Tarasenko Erik Čižmár Vladimír Tkáč Alexander Feher Alžbeta Orendáčová Martin Orendáč Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and Theory Magnetochemistry rotational magnetocaloric effect entropy adiabatic temperature change magnetic anisotropy crystal field |
| title | Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and Theory |
| title_full | Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and Theory |
| title_fullStr | Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and Theory |
| title_full_unstemmed | Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and Theory |
| title_short | Giant Rotational Magnetocaloric Effect in Ni(<i>en</i>)(H<sub>2</sub>O)<sub>4</sub>·2H<sub>2</sub>O: Experiment and Theory |
| title_sort | giant rotational magnetocaloric effect in ni i en i h sub 2 sub o sub 4 sub ·2h sub 2 sub o experiment and theory |
| topic | rotational magnetocaloric effect entropy adiabatic temperature change magnetic anisotropy crystal field |
| url | https://www.mdpi.com/2312-7481/8/4/39 |
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