Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions
An experimental study of the magnetocaloric effect in tetraaquabis(hydrogen maleato)nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ] powder sample is presented. The magnetocaloric properties of the studied sample were investigated using specific heat and magnetization measurements in magnetic fields up t...
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MDPI AG
2022
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ftdoajarticles:oai:doaj.org/article:b561b526220a4036b815c5deb532cb4f 2023-05-15T17:53:59+02:00 Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions Petro Danylchenko Róbert Tarasenko Erik Čižmár Vladimír Tkáč Anna Uhrinová Alžbeta Orendáčová Martin Orendáč 2022-09-01T00:00:00Z https://doi.org/10.3390/magnetochemistry8090106 https://doaj.org/article/b561b526220a4036b815c5deb532cb4f EN eng MDPI AG https://www.mdpi.com/2312-7481/8/9/106 https://doaj.org/toc/2312-7481 doi:10.3390/magnetochemistry8090106 2312-7481 https://doaj.org/article/b561b526220a4036b815c5deb532cb4f Magnetochemistry, Vol 8, Iss 106, p 106 (2022) magnetocaloric effect entropy adiabatic temperature change magnetic anisotropy crystal field Chemistry QD1-999 article 2022 ftdoajarticles https://doi.org/10.3390/magnetochemistry8090106 2022-12-31T00:33:46Z An experimental study of the magnetocaloric effect in tetraaquabis(hydrogen maleato)nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ] powder sample is presented. The magnetocaloric properties of the studied sample were investigated using specific heat and magnetization measurements in magnetic fields up to 9 T in the temperature range from 0.4 to 50 K. A large conventional magnetocaloric effect was found at a temperature of about 3.5 K, where −Δ S M = 8.5 Jkg −1 K −1 and 11.2 Jkg −1 K −1 for a magnetic field of 5 T and 7 T, respectively. Assuming a substantial role of the crystal field, the temperature dependence of the magnetic specific heat in a zero magnetic field was compared with an S = 1 model with single-ion anisotropy parameters D and E (axial and rhombic). The best agreement was found for the parameters D / k B = −7.82 K and E / k B = −2.15 K. On the other hand, the experimental temperature dependence of −Δ S M shows higher values compared to the theoretical prediction for the mentioned model, indicating the presence of additional factors in the system, such as an exchange interaction between magnetic ions. The first exchange pathway can be realized through maleic rings between the nearest Ni(II) ions. The second exchange pathway can be realized through water molecules approximately along the a crystallographic axis. Broken-symmetry DFT calculations performed using the computational package ORCA provided the values of ferromagnetic exchange interactions, J 1 / k B = 1.50 K and J 2 / k B = 1.44 K (using B3LYP functional). The presence of such ferromagnetic correlations in the studied system may explain the enhanced magnetocaloric effect compared with the model of an anisotropic spin-1 paramagnet. Article in Journal/Newspaper Orca Directory of Open Access Journals: DOAJ Articles Magnetochemistry 8 9 106 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
magnetocaloric effect entropy adiabatic temperature change magnetic anisotropy crystal field Chemistry QD1-999 |
spellingShingle |
magnetocaloric effect entropy adiabatic temperature change magnetic anisotropy crystal field Chemistry QD1-999 Petro Danylchenko Róbert Tarasenko Erik Čižmár Vladimír Tkáč Anna Uhrinová Alžbeta Orendáčová Martin Orendáč Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions |
topic_facet |
magnetocaloric effect entropy adiabatic temperature change magnetic anisotropy crystal field Chemistry QD1-999 |
description |
An experimental study of the magnetocaloric effect in tetraaquabis(hydrogen maleato)nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ] powder sample is presented. The magnetocaloric properties of the studied sample were investigated using specific heat and magnetization measurements in magnetic fields up to 9 T in the temperature range from 0.4 to 50 K. A large conventional magnetocaloric effect was found at a temperature of about 3.5 K, where −Δ S M = 8.5 Jkg −1 K −1 and 11.2 Jkg −1 K −1 for a magnetic field of 5 T and 7 T, respectively. Assuming a substantial role of the crystal field, the temperature dependence of the magnetic specific heat in a zero magnetic field was compared with an S = 1 model with single-ion anisotropy parameters D and E (axial and rhombic). The best agreement was found for the parameters D / k B = −7.82 K and E / k B = −2.15 K. On the other hand, the experimental temperature dependence of −Δ S M shows higher values compared to the theoretical prediction for the mentioned model, indicating the presence of additional factors in the system, such as an exchange interaction between magnetic ions. The first exchange pathway can be realized through maleic rings between the nearest Ni(II) ions. The second exchange pathway can be realized through water molecules approximately along the a crystallographic axis. Broken-symmetry DFT calculations performed using the computational package ORCA provided the values of ferromagnetic exchange interactions, J 1 / k B = 1.50 K and J 2 / k B = 1.44 K (using B3LYP functional). The presence of such ferromagnetic correlations in the studied system may explain the enhanced magnetocaloric effect compared with the model of an anisotropic spin-1 paramagnet. |
format |
Article in Journal/Newspaper |
author |
Petro Danylchenko Róbert Tarasenko Erik Čižmár Vladimír Tkáč Anna Uhrinová Alžbeta Orendáčová Martin Orendáč |
author_facet |
Petro Danylchenko Róbert Tarasenko Erik Čižmár Vladimír Tkáč Anna Uhrinová Alžbeta Orendáčová Martin Orendáč |
author_sort |
Petro Danylchenko |
title |
Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions |
title_short |
Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions |
title_full |
Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions |
title_fullStr |
Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions |
title_full_unstemmed |
Experimental Study of Magnetocaloric Effect in Tetraaquabis(Hydrogen Maleato)Nickel(II), [Ni(C 4 H 3 O 4 ) 2 (H 2 O) 4 ]—A Potential Realization of a Spin-1 Spatially Anisotropic Square Lattice with Ferromagnetic Interactions |
title_sort |
experimental study of magnetocaloric effect in tetraaquabis(hydrogen maleato)nickel(ii), [ni(c 4 h 3 o 4 ) 2 (h 2 o) 4 ]—a potential realization of a spin-1 spatially anisotropic square lattice with ferromagnetic interactions |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/magnetochemistry8090106 https://doaj.org/article/b561b526220a4036b815c5deb532cb4f |
genre |
Orca |
genre_facet |
Orca |
op_source |
Magnetochemistry, Vol 8, Iss 106, p 106 (2022) |
op_relation |
https://www.mdpi.com/2312-7481/8/9/106 https://doaj.org/toc/2312-7481 doi:10.3390/magnetochemistry8090106 2312-7481 https://doaj.org/article/b561b526220a4036b815c5deb532cb4f |
op_doi |
https://doi.org/10.3390/magnetochemistry8090106 |
container_title |
Magnetochemistry |
container_volume |
8 |
container_issue |
9 |
container_start_page |
106 |
_version_ |
1766161705523478528 |