The multiferroic bismuth ferrites Bi12Fe0.63O18.945, BiFeO3, and Bi2Fe4O9 have been selectively synthesized from the same bismuth and iron sources via a simple hydrothermal route. The controllable morphologies shown in the figure can be obtained by changing the pH of the precursor solution and the heating temperature. SEM and TEM characterization confirm the high quality of the products, while magnetic measurements indicate G-type spin antiferromagnetic ordering.
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