期刊
PHYSICA B-CONDENSED MATTER
卷 511, 期 -, 页码 89-98出版社
ELSEVIER
DOI: 10.1016/j.physb.2017.02.010
关键词
Nanoparticles; Fe doped TiO2; Sol-gel; Magnetic properties; SQUID
In this work Fe doped TiO2 nanoparticles were synthesized at different Fe/Ti molar ratio from 1% to 5% by solgel technique. The post annealing of the samples was carried out at T=400, 600, and 800 degrees C. HRTEM of the samples revealed that the mean size of the nanoparticles increases from about 8 nm to about 100 nm as the annealing temperature increased. SQUID magnetometry of 1% and 5% Fe doped TiO2 has shown mixed ferromagnetic and paramagnetic phases within the crystal while ferromagnetic order with T-c about 350 K was only observed in 5% Fe: TiO2 sample annealed at T=800 degrees C. The oxygen vacancy mediated ferromagnetic (FM) interaction could be responsible for the observed FM.
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