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Superparamagnetic and ferromagnetic behavior of ZnFe2O4 nanoparticles synthesized by microwave-assisted hydrothermal method |
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| Authors: | Phuruangrat Anukorn Maisang Wachiraporn Phonkhokkong Thirawit Thongtem Somchai Thongtem Titipun |
| Institution: | 1.Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand ;2.Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand ;3.Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand ;4.Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand ; |
| Abstract: | Zinc ferrite (ZnFe2O4) nanoparticles were successfully synthesized from Zn(NO3)2 · 6H2O and Fe(NO3)3 · 9H2O by microwave hydrothermal method at 150°C for 1 h. Cubic ZnFe2O4 with particle size below 7 nm was formed in the solution at pH ≥ 6. The crystallinity and particle size of ZnFe2O4 nanoparticles were increased after calcination. The effects of pH of the precursor solution and calcination on the particle size and crystallinity of the particles were studied. At room temperature the products show superparamagnetic and ferromagnetic properties, determined by their size. The formation mechanism of ZnFe2O4 was also discussed according to the experimental results. |
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