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Magnetocaloric effect and critical behavior in
A comprehensive study of magnetocaloric effect (MCE) and critical behavior in the {Mn2(imH)2(H2O)4[Nb(CN)8]·4H2O}n molecular magnet is reported. The compound is an example of a magnetic sponge, where structural changes provoked by dehydration process lead to the increase of Tc critical temperature from 25 K for the as-synthesized sample (1) up to 60 K for the anhydrous one (2). MCE and critical behavior were investigated by magnetization measurements. The maximum value of magnetic entropy change ΔS, determined by the magnetization measurements for 1 is 6.70 J mol−1 K−1 (8.95 J kg−1 K−1) at µ0ΔH=5 T, while for 2 it is equal to 4.02 J mol−1 K−1 (7.73 J kg−1 K−1) at the same magnetic field change. The field dependence of MCE at Tc for 1 and 2 was consistent with critical exponents, which allowed to classify both phases to 3D Heisenberg universality class. The View the MathML sourceTc-2/3 dependence of the maximum entropy change has been tested using data of 1 and 2 together with MCE data previously reported for other members of the ferrimagnetic Mn2-l-[Nb(CN)8] (L=imidazole, pyridazine and pyrazole) series. Experimental MCE results have been compared with the spin contribution to the magnetic entropy change estimated using a molecular field approximation.
cris.lastimport.wos | 2024-04-09T22:41:30Z | |
dc.abstract.en | A comprehensive study of magnetocaloric effect (MCE) and critical behavior in the {Mn2(imH)2(H2O)4[Nb(CN)8]·4H2O}n molecular magnet is reported. The compound is an example of a magnetic sponge, where structural changes provoked by dehydration process lead to the increase of Tc critical temperature from 25 K for the as-synthesized sample (1) up to 60 K for the anhydrous one (2). MCE and critical behavior were investigated by magnetization measurements. The maximum value of magnetic entropy change ΔS, determined by the magnetization measurements for 1 is 6.70 J mol−1 K−1 (8.95 J kg−1 K−1) at µ0ΔH=5 T, while for 2 it is equal to 4.02 J mol−1 K−1 (7.73 J kg−1 K−1) at the same magnetic field change. The field dependence of MCE at Tc for 1 and 2 was consistent with critical exponents, which allowed to classify both phases to 3D Heisenberg universality class. The View the MathML sourceTc-2/3 dependence of the maximum entropy change has been tested using data of 1 and 2 together with MCE data previously reported for other members of the ferrimagnetic Mn2-l-[Nb(CN)8] (L=imidazole, pyridazine and pyrazole) series. Experimental MCE results have been compared with the spin contribution to the magnetic entropy change estimated using a molecular field approximation. | pl |
dc.affiliation | Wydział Chemii : Zakład Chemii Nieorganicznej | pl |
dc.contributor.author | Fitta, Magdalena | pl |
dc.contributor.author | Pełka, Robert | pl |
dc.contributor.author | Gajewski, Marcin | pl |
dc.contributor.author | Mihalik, Marian | pl |
dc.contributor.author | Zentkova, Maria | pl |
dc.contributor.author | Pinkowicz, Dawid - 126341 | pl |
dc.contributor.author | Sieklucka, Barbara - 131848 | pl |
dc.contributor.author | Bałanda, Maria | pl |
dc.date.accessioned | 2015-11-25T12:36:15Z | |
dc.date.available | 2015-11-25T12:36:15Z | |
dc.date.issued | 2015 | pl |
dc.description.physical | 1-8 | pl |
dc.description.volume | 396 | pl |
dc.identifier.doi | 10.1016/j.jmmm.2015.07.112 | pl |
dc.identifier.eissn | 1873-4766 | pl |
dc.identifier.issn | 0304-8853 | pl |
dc.identifier.uri | http://ruj.uj.edu.pl/xmlui/handle/item/17110 | |
dc.language | eng | pl |
dc.language.container | eng | pl |
dc.rights.licence | bez licencji | |
dc.subtype | Article | pl |
dc.title | Magnetocaloric effect and critical behavior in $Mn_2-imidazole-[Nb(CN)_8]$ molecular magnetic sponge | pl |
dc.title.journal | Journal of Magnetism and Magnetic Materials | pl |
dc.type | JournalArticle | pl |
dspace.entity.type | Publication |