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A 5 Nb 4 O 15 (A=Ba, Sr) powders with hexagonal perovskite structures have been firstly synthesized by a two-step hydrothermal process. These oxides were crystallized directly from niobium oxide in the presence of potassium basic solutions at 240 °C for 48 h. The products were characterized by powder X-ray diffraction and scanning electron microscopy. It was found that the...
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