- Tytuł:
- Effect of Surfactant on Magnetic and Optical Properties of $α-Fe_2O_3$ Nanoparticles
- Autorzy:
-
Mirza, I.
Sarfraz, A.
Hasanain, S. - Powiązania:
- https://bibliotekanauki.pl/articles/1377739.pdf
- Data publikacji:
- 2014-12
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
78.66.Qn
75.47.Lx
78.67.Bf
75.75.-c
78.67.-n - Opis:
- Hematite $(α-Fe_{2}O_{3})$ nanoparticles and hematite nanoparticles coated with polyvinylpyrrolidone (PVP) are synthesized chemically by co-precipitation. Prolysis and microemulsion methods respectively. An average size of nanoparticles (both coated and uncoated) was found by the broadening of the X-ray diffraction peaks using Scherrer's formula. It was found that coating reduced particle sizes. The attachment of the polymer on the surface of particles was confirmed by the Fourier transform infrared spectroscopy and thermogravimetric analysis. Optical ultraviolet/visible reflectance test also indicated the presence of PVP in coated nanohematites. In magnetic studies, it was observed that coating does not change main magnetic character of the $α-Fe_{2}O_{3}$ nanoparticles however it reduces DC magnetization (as a function of applied field and temperature) to a considerable amount. Moreover it was observed that after coating Morin transition temperature $T_{M}$ and its width $ΔT_{M}$ shifts to lower values, which is another indication of size reduction.
- Źródło:
-
Acta Physica Polonica A; 2014, 126, 6; 1280-1287
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł