TY - JOUR
T1 - Mossbauer investigations in hematite nanoparticles
AU - Al-Omari, Imaddin A.
AU - Narayanaswamy, Venkatesha
AU - Halder, Sajib
AU - Hamdeh, Hussien H.
AU - Alaabed, Sulaiman
AU - Kamzin, Aleksandr S.
AU - Muralee Gopi, Chandu V.V.
AU - Khaleel, Abbas
AU - Issa, Bashar
AU - Obaidat, Ihab M.
N1 - Publisher Copyright:
© 2021 by the authors.
PY - 2021/10/16
Y1 - 2021/10/16
N2 - Hematite nanoparticles of average size 20 nm were synthesized using the sol-gel method, and the structural characterizations were conducted using XRD and TEM. The XRD profile revealed a small fraction of the maghemite phase and the main hematite phase. Mössbauer spectroscopy was used to study the magnetic structure of the particles and revealed a third but very slight non-magnetic phase. Mössbauer spectrum shows 35% of the nanoparticles exhibiting superparamagnetism. The weighted average Morin transition temperature for the particles determined by Mössbauer is 262 K, which is remarkably similar to the bulk value and higher than the Morin transition determined by VSM (about 250 K). The reported findings on the hematite nanoparticles will help understand the enhanced ferromagnetic behavior of the hematite nanoparticles at room temperature, which is crucial for potential applications.
AB - Hematite nanoparticles of average size 20 nm were synthesized using the sol-gel method, and the structural characterizations were conducted using XRD and TEM. The XRD profile revealed a small fraction of the maghemite phase and the main hematite phase. Mössbauer spectroscopy was used to study the magnetic structure of the particles and revealed a third but very slight non-magnetic phase. Mössbauer spectrum shows 35% of the nanoparticles exhibiting superparamagnetism. The weighted average Morin transition temperature for the particles determined by Mössbauer is 262 K, which is remarkably similar to the bulk value and higher than the Morin transition determined by VSM (about 250 K). The reported findings on the hematite nanoparticles will help understand the enhanced ferromagnetic behavior of the hematite nanoparticles at room temperature, which is crucial for potential applications.
KW - Hematite
KW - Morin transition
KW - Nanoparticles
KW - Surface spins
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U2 - 10.33263/BRIAC124.46264636
DO - 10.33263/BRIAC124.46264636
M3 - Article
AN - SCOPUS:85117724865
SN - 2069-5837
VL - 12
SP - 4626
EP - 4636
JO - Biointerface Research in Applied Chemistry
JF - Biointerface Research in Applied Chemistry
IS - 4
ER -