Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix
Autori
Milivojević, DušanBabić-Stojić, Branka S.
Jokanović, Vukoman R.
Jagličić, Zvonko
Makovec, Darko
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
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 moment...s 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.
Izvor:
Acta Physica Polonica A, 2011, 120, 2, 316-321Finansiranje / projekti:
- Hemijsko i strukturno dizajniranje nanomaterijala za primenu u medicini i inženjerstvu tkiva (RS-MESTD-Basic Research (BR or ON)-172026)
Napomena:
- 12th Annual YUCOMAT Conference, Sep 06-10, 2010, Herceg Novi, Montenegro
DOI: 10.12693/APhysPolA.120.316
ISSN: 0587-4246
WoS: 000291836900024
Scopus: 2-s2.0-79960138113
Institucija/grupa
VinčaTY - JOUR AU - Milivojević, Dušan AU - Babić-Stojić, Branka S. AU - Jokanović, Vukoman R. AU - Jagličić, Zvonko AU - Makovec, Darko PY - 2011 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6924 AB - 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. T2 - Acta Physica Polonica A T1 - Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix VL - 120 IS - 2 SP - 316 EP - 321 DO - 10.12693/APhysPolA.120.316 ER -
@article{ author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Makovec, Darko", year = "2011", 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.", journal = "Acta Physica Polonica A", title = "Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix", volume = "120", number = "2", pages = "316-321", doi = "10.12693/APhysPolA.120.316" }
Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z.,& Makovec, D.. (2011). Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix. in Acta Physica Polonica A, 120(2), 316-321. https://doi.org/10.12693/APhysPolA.120.316
Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Makovec D. Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix. in Acta Physica Polonica A. 2011;120(2):316-321. doi:10.12693/APhysPolA.120.316 .
Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Makovec, Darko, "Magnetic Properties of Mn-Doped Amorphous SiO2 Matrix" in Acta Physica Polonica A, 120, no. 2 (2011):316-321, https://doi.org/10.12693/APhysPolA.120.316 . .