High concentration of hematite nanoparticles in a silica matrix: Structural and magnetic properties
Апстракт
The alpha-Fe(2)O(3)/SiO(2) nanocomposite containing 45 wt% of hematite was prepared by the sol-gel method followed by heating in air at 200 degrees C. The so-obtained composite of iron(III) nanoparticles dissolved in glassy silica matrix was investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and superconducting quantum interference device (SQUID) magnetometry. XRPD confirms the formation of a single-phase hematite sample, whereas TEM reveals spherical particles in a silica matrix with an average diameter of 10 nm. DC magnetization shows bifurcation of the zero-field-cooled (ZFC) and field-cooled (FC) branches up to the room temperature with a blocking temperature TB 65 K. Isothermal M( H) dependence displays significant hysteretic behaviour below TB, whereas the room temperature data were successfully fitted to a weighted Langevin function. The average particle size obtained from this fit is in agreement with the TEM findings. The small shift of th...e TB value with the magnetic field strength, narrowing of the hysteresis loop at low applied field, and the frequency dependence of the AC susceptibility data point to the presence of inter-particle interactions. The analysis of the results suggests that the system consists of single-domain nanoparticles with intermediate strength interactions. (c) 2008 Elsevier B.V. All rights reserved.
Кључне речи:
Hematite / Magnetic nanoparticle / Inter-particle interaction / AC susceptibility / SuperparamagnetismИзвор:
Journal of Magnetism and Magnetic Materials, 2009, 321, 1, 12-16Финансирање / пројекти:
- Serbian Ministry of Science and Environmental Protection [141027]
DOI: 10.1016/j.jmmm.2008.07.006
ISSN: 0304-8853
WoS: 000260301900004
Scopus: 2-s2.0-54249090641
Колекције
Институција/група
VinčaTY - JOUR AU - Tadić, Marin AU - Kusigerski, Vladan AU - Marković, Dragana AU - Milošević, Irena AU - Spasojević, Vojislav PY - 2009 UR - https://vinar.vin.bg.ac.rs/handle/123456789/3549 AB - The alpha-Fe(2)O(3)/SiO(2) nanocomposite containing 45 wt% of hematite was prepared by the sol-gel method followed by heating in air at 200 degrees C. The so-obtained composite of iron(III) nanoparticles dissolved in glassy silica matrix was investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and superconducting quantum interference device (SQUID) magnetometry. XRPD confirms the formation of a single-phase hematite sample, whereas TEM reveals spherical particles in a silica matrix with an average diameter of 10 nm. DC magnetization shows bifurcation of the zero-field-cooled (ZFC) and field-cooled (FC) branches up to the room temperature with a blocking temperature TB 65 K. Isothermal M( H) dependence displays significant hysteretic behaviour below TB, whereas the room temperature data were successfully fitted to a weighted Langevin function. The average particle size obtained from this fit is in agreement with the TEM findings. The small shift of the TB value with the magnetic field strength, narrowing of the hysteresis loop at low applied field, and the frequency dependence of the AC susceptibility data point to the presence of inter-particle interactions. The analysis of the results suggests that the system consists of single-domain nanoparticles with intermediate strength interactions. (c) 2008 Elsevier B.V. All rights reserved. T2 - Journal of Magnetism and Magnetic Materials T1 - High concentration of hematite nanoparticles in a silica matrix: Structural and magnetic properties VL - 321 IS - 1 SP - 12 EP - 16 DO - 10.1016/j.jmmm.2008.07.006 ER -
@article{ author = "Tadić, Marin and Kusigerski, Vladan and Marković, Dragana and Milošević, Irena and Spasojević, Vojislav", year = "2009", abstract = "The alpha-Fe(2)O(3)/SiO(2) nanocomposite containing 45 wt% of hematite was prepared by the sol-gel method followed by heating in air at 200 degrees C. The so-obtained composite of iron(III) nanoparticles dissolved in glassy silica matrix was investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and superconducting quantum interference device (SQUID) magnetometry. XRPD confirms the formation of a single-phase hematite sample, whereas TEM reveals spherical particles in a silica matrix with an average diameter of 10 nm. DC magnetization shows bifurcation of the zero-field-cooled (ZFC) and field-cooled (FC) branches up to the room temperature with a blocking temperature TB 65 K. Isothermal M( H) dependence displays significant hysteretic behaviour below TB, whereas the room temperature data were successfully fitted to a weighted Langevin function. The average particle size obtained from this fit is in agreement with the TEM findings. The small shift of the TB value with the magnetic field strength, narrowing of the hysteresis loop at low applied field, and the frequency dependence of the AC susceptibility data point to the presence of inter-particle interactions. The analysis of the results suggests that the system consists of single-domain nanoparticles with intermediate strength interactions. (c) 2008 Elsevier B.V. All rights reserved.", journal = "Journal of Magnetism and Magnetic Materials", title = "High concentration of hematite nanoparticles in a silica matrix: Structural and magnetic properties", volume = "321", number = "1", pages = "12-16", doi = "10.1016/j.jmmm.2008.07.006" }
Tadić, M., Kusigerski, V., Marković, D., Milošević, I.,& Spasojević, V.. (2009). High concentration of hematite nanoparticles in a silica matrix: Structural and magnetic properties. in Journal of Magnetism and Magnetic Materials, 321(1), 12-16. https://doi.org/10.1016/j.jmmm.2008.07.006
Tadić M, Kusigerski V, Marković D, Milošević I, Spasojević V. High concentration of hematite nanoparticles in a silica matrix: Structural and magnetic properties. in Journal of Magnetism and Magnetic Materials. 2009;321(1):12-16. doi:10.1016/j.jmmm.2008.07.006 .
Tadić, Marin, Kusigerski, Vladan, Marković, Dragana, Milošević, Irena, Spasojević, Vojislav, "High concentration of hematite nanoparticles in a silica matrix: Structural and magnetic properties" in Journal of Magnetism and Magnetic Materials, 321, no. 1 (2009):12-16, https://doi.org/10.1016/j.jmmm.2008.07.006 . .