Abstract
Single crystals of BiFeO3 were prepared by hydrothermal synthesis using hydrate sodium bismuth oxide (NaBiO3·nH2O) and iron nitrates (Fe(NO3)3·9H2O) in the potassium hydroxide solutions. The size of BiFeO3 single crystals increased with the reaction temperature and duration. Single crystals of sillenite-type Bi12.5Fe0.5O19.5 and Bi2Fe4O9 were also obtained depending on the conditions. From the chemical analysis, the chemical composition of the crystals was deduced to be Bi0.96K0.03FeO3. Although the crystals contained a small amount of potassium, the lattice parameters of the crystals agreed well with the pure BiFeO3 and the Curie temperature was not affected by this replacement.
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