Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix
Apstrakt
We have observed unusual magnetic properties of NiO (nickel oxide) nanoparticles embedded in a silica matrix. The sample was synthesized by a method based on the contribution of sol-gel and combustion processes. X-ray powder diffraction (XRPD) of the sample shows the formation of the nanocrystalline NiO phase whereas transmission electron microscope (TEM) reveals spherical-shaped nanoparticles of about 4 nm diameter. Moreover, HRTEM images show lattice fringes of the nanoparticles and defects in the crystal structure. The temperature and field dependence of the magnetization are also measured. The zero-field-cooled (ZFC) measurements show two maximums, one sharp and narrow at low temperatures similar to 6.5K and an other broad one at higher temperature similar to 64 K. The FC magnetization shows a continuous increase upon lowering the temperature. The M(H) measurements reveal that NiO nanoparticles display anomalous hysteretic behaviors at low temperatures (below the low temperature ma...ximum in the ZFC curve, 2K and 5K) showing that the magnetization initial curve lies below the hysteresis loop for a certain field range. Moreover, jump of the magnetization at low temperatures (2K and 5K) are also observed. These features represent novel magnetic properties for nanosized NiO which may be attributed to the surface spins. Moreover, these results indicate that the NiO nanoparticle consists of magnetically disorder shell and antiferromagnetically order core with an uncompensated magnetic moment. (C) 2011 Elsevier B. V. All rights reserved.
Ključne reči:
Nickel oxide (NiO) / Hysteresis loop / Nanomaterials / Sol-gel synthesis / Magnetic materialsIzvor:
Journal of Alloys and Compounds, 2011, 509, 25, 7134-7138Finansiranje / projekti:
- Magnetni i radionuklidima obeleženi nanostrukturni materijali za primene u medicini (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45015)
DOI: 10.1016/j.jallcom.2011.04.032
ISSN: 0925-8388
WoS: 000290794000027
Scopus: 2-s2.0-79956351545
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Tadić, Marin AU - Panjan, Matjaž AU - Marković, D. AU - Milošević, Irena AU - Spasojević, Vojislav PY - 2011 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4318 AB - We have observed unusual magnetic properties of NiO (nickel oxide) nanoparticles embedded in a silica matrix. The sample was synthesized by a method based on the contribution of sol-gel and combustion processes. X-ray powder diffraction (XRPD) of the sample shows the formation of the nanocrystalline NiO phase whereas transmission electron microscope (TEM) reveals spherical-shaped nanoparticles of about 4 nm diameter. Moreover, HRTEM images show lattice fringes of the nanoparticles and defects in the crystal structure. The temperature and field dependence of the magnetization are also measured. The zero-field-cooled (ZFC) measurements show two maximums, one sharp and narrow at low temperatures similar to 6.5K and an other broad one at higher temperature similar to 64 K. The FC magnetization shows a continuous increase upon lowering the temperature. The M(H) measurements reveal that NiO nanoparticles display anomalous hysteretic behaviors at low temperatures (below the low temperature maximum in the ZFC curve, 2K and 5K) showing that the magnetization initial curve lies below the hysteresis loop for a certain field range. Moreover, jump of the magnetization at low temperatures (2K and 5K) are also observed. These features represent novel magnetic properties for nanosized NiO which may be attributed to the surface spins. Moreover, these results indicate that the NiO nanoparticle consists of magnetically disorder shell and antiferromagnetically order core with an uncompensated magnetic moment. (C) 2011 Elsevier B. V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix VL - 509 IS - 25 SP - 7134 EP - 7138 DO - 10.1016/j.jallcom.2011.04.032 ER -
@article{ author = "Tadić, Marin and Panjan, Matjaž and Marković, D. and Milošević, Irena and Spasojević, Vojislav", year = "2011", abstract = "We have observed unusual magnetic properties of NiO (nickel oxide) nanoparticles embedded in a silica matrix. The sample was synthesized by a method based on the contribution of sol-gel and combustion processes. X-ray powder diffraction (XRPD) of the sample shows the formation of the nanocrystalline NiO phase whereas transmission electron microscope (TEM) reveals spherical-shaped nanoparticles of about 4 nm diameter. Moreover, HRTEM images show lattice fringes of the nanoparticles and defects in the crystal structure. The temperature and field dependence of the magnetization are also measured. The zero-field-cooled (ZFC) measurements show two maximums, one sharp and narrow at low temperatures similar to 6.5K and an other broad one at higher temperature similar to 64 K. The FC magnetization shows a continuous increase upon lowering the temperature. The M(H) measurements reveal that NiO nanoparticles display anomalous hysteretic behaviors at low temperatures (below the low temperature maximum in the ZFC curve, 2K and 5K) showing that the magnetization initial curve lies below the hysteresis loop for a certain field range. Moreover, jump of the magnetization at low temperatures (2K and 5K) are also observed. These features represent novel magnetic properties for nanosized NiO which may be attributed to the surface spins. Moreover, these results indicate that the NiO nanoparticle consists of magnetically disorder shell and antiferromagnetically order core with an uncompensated magnetic moment. (C) 2011 Elsevier B. V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix", volume = "509", number = "25", pages = "7134-7138", doi = "10.1016/j.jallcom.2011.04.032" }
Tadić, M., Panjan, M., Marković, D., Milošević, I.,& Spasojević, V.. (2011). Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix. in Journal of Alloys and Compounds, 509(25), 7134-7138. https://doi.org/10.1016/j.jallcom.2011.04.032
Tadić M, Panjan M, Marković D, Milošević I, Spasojević V. Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix. in Journal of Alloys and Compounds. 2011;509(25):7134-7138. doi:10.1016/j.jallcom.2011.04.032 .
Tadić, Marin, Panjan, Matjaž, Marković, D., Milošević, Irena, Spasojević, Vojislav, "Unusual magnetic properties of NiO nanoparticles embedded in a silica matrix" in Journal of Alloys and Compounds, 509, no. 25 (2011):7134-7138, https://doi.org/10.1016/j.jallcom.2011.04.032 . .