Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix
Samo za registrovane korisnike
2011
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-oxide nanoparticles dispersed in an amorphous SiO2 matrix with manganese concentration 0.7 and 3 at% have been synthesized 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. Insilica matrix two types of Mn-rich particles are dispersed, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High temperature magnetic susceptibility study 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 with antiferromagnetic interactions. 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 susce...ptibility in the sample with 3 at% Mn suggest that the magnetic moments of the smaller Mn3O4 nanoparticles with dimensions below 10 nm are exposed to thermally activated blocking process just below the Curie temperature T-C. Appearance of a maximum in the zero-field-cooled magnetization for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments at low temperatures which might occur in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure. (C) 2010 Elsevier B.V. All rights reserved.
Ključne reči:
Sol-gel / Nanoparticles / Mn-oxides / Blocking process / Spin glassIzvor:
Journal of Magnetism and Magnetic Materials, 2011, 323, 6, 805-812Finansiranje / projekti:
- Hemijsko i strukturno dizajniranje nanomaterijala za primenu u medicini i inženjerstvu tkiva (RS-MESTD-Basic Research (BR or ON)-172026)
DOI: 10.1016/j.jmmm.2010.11.002
ISSN: 0304-8853
WoS: 000285573500023
Scopus: 2-s2.0-78650524174
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/123456789/4177 AB - Samples of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix with manganese concentration 0.7 and 3 at% have been synthesized 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. Insilica matrix two types of Mn-rich particles are dispersed, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High temperature magnetic susceptibility study 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 with antiferromagnetic interactions. 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 exposed to thermally activated blocking process just below the Curie temperature T-C. Appearance of a maximum in the zero-field-cooled magnetization for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments at low temperatures which might occur in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure. (C) 2010 Elsevier B.V. All rights reserved. T2 - Journal of Magnetism and Magnetic Materials T1 - Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix VL - 323 IS - 6 SP - 805 EP - 812 DO - 10.1016/j.jmmm.2010.11.002 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-oxide nanoparticles dispersed in an amorphous SiO2 matrix with manganese concentration 0.7 and 3 at% have been synthesized 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. Insilica matrix two types of Mn-rich particles are dispersed, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High temperature magnetic susceptibility study 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 with antiferromagnetic interactions. 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 exposed to thermally activated blocking process just below the Curie temperature T-C. Appearance of a maximum in the zero-field-cooled magnetization for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments at low temperatures which might occur in the geometrically frustrated Mn sublattice of the lambda-MnO2 crystal structure. (C) 2010 Elsevier B.V. All rights reserved.", journal = "Journal of Magnetism and Magnetic Materials", title = "Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix", volume = "323", number = "6", pages = "805-812", doi = "10.1016/j.jmmm.2010.11.002" }
Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z.,& Makovec, D.. (2011). Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix. in Journal of Magnetism and Magnetic Materials, 323(6), 805-812. https://doi.org/10.1016/j.jmmm.2010.11.002
Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Makovec D. Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix. in Journal of Magnetism and Magnetic Materials. 2011;323(6):805-812. doi:10.1016/j.jmmm.2010.11.002 .
Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Makovec, Darko, "Magnetic properties of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix" in Journal of Magnetism and Magnetic Materials, 323, no. 6 (2011):805-812, https://doi.org/10.1016/j.jmmm.2010.11.002 . .