Berlin green FeFe(CN) 6 microcubic crystals have been successfully prepared by a simple hydrothermal process between K 3 [Fe(CN) 6 ] with Na 2 S 2 O 3 aqueous solution, free of any surfactant or template. The experimental results clearly show that the molar ratio of K 3 [Fe(CN) 6 ] to Na 2 S 2 O 3 and their concentrations are the dominant processing factors in controlling the size, morphology, and composition of the resulting products.
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Yang et al. (2006) studied this question.
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