Abstract
For investigation of the grain-size dependence on magnetization, NiFe2O4 nanoparticles were heated at 440 °C, 600 °C, 800 °C, and 1000 °C with and without oleic acid. It was recognized that the median diameter (D50) increased from 5.9 to 145.9 nm by the heat treatments from 440 to 1000 °C. In addition, it was confirmed that NiFe2O4 nanoparticles after the heat treatment with oleic acid at 600 °C have higher grain growth rate than that after only heat treatment without oleic acid. It was deduced that NiFe2O4 was dissolved in oleic acid, so that sintering speed became fast. From these results, it was concluded that the formally observed saturation magnetization increase in heat treated NiFe2O4 nanoparticles with oleic acid was caused partly by grain growth enhancement with the presence of oleic acid.
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