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Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix
dc.creator | Milivojević, Dušan | |
dc.creator | Babić-Stojić, Branka S. | |
dc.creator | Jokanović, Vukoman R. | |
dc.creator | Jagličić, Zvonko | |
dc.creator | Makovec, Darko | |
dc.date.accessioned | 2018-03-03T14:45:54Z | |
dc.date.available | 2018-03-03T14:45:54Z | |
dc.date.issued | 2011 | |
dc.identifier.issn | 0587-4246 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/6924 | |
dc.description.abstract | Samples of Mn-doped amorphous SiO2 matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 - 20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is lambda-MnO2. At temperatures below T-C = 43 K strong ferrimagnetism originating from the minor Mn3O4 phase masks the relatively weak magnetism of lambda-MnO2. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller Mn3O4 nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature T-C. The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure. | en |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172026/RS// | |
dc.rights | openAccess | en |
dc.source | Acta Physica Polonica A | en |
dc.title | Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix | en |
dc.type | article | en |
dcterms.abstract | Маковец, Д.; Бабић-Стојић Бранка С.; Јокановић Вукоман Р.; Јаглициц, З.; Миливојевић Душан; | |
dc.citation.volume | 120 | |
dc.citation.issue | 2 | |
dc.citation.spage | 316 | |
dc.citation.epage | 321 | |
dc.identifier.wos | 000291836900024 | |
dc.identifier.doi | 10.12693/APhysPolA.120.316 | |
dc.citation.rank | M23 | |
dc.description.other | 12th Annual YUCOMAT Conference, Sep 06-10, 2010, Herceg Novi, Montenegro | en |
dc.type.version | publishedVersion | |
dc.identifier.scopus | 2-s2.0-79960138113 | |
dc.identifier.fulltext | https://vinar.vin.bg.ac.rs//bitstream/id/13826/6920.pdf |
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030 - Laboratorija za radijacionu hemiju i fiziku
Department of Radiation Chemistry and Physics