Topochemical Synthesis of a High-Aspect-Ratio Platelet NaNbO3 Template |
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| Authors: | Yongke Yan Dan Liu Wei Zhao Heping Zhou Hui Fang |
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| Affiliation: | State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; Electron Microscope Laboratory, Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | A high-aspect-ratio platelet sodium niobate (NaNbO3) was synthesized by a topochemical reaction. Plate-like layered-perovskite Bi2.5Na3.5Nb5O18 (BNN5) as a precursor was first prepared, and then Bi3+ in the precursor phase was replaced by Na+ through topotactic conversion and perovskite NaNbO3 formed at 950°C in NaCl molten salt. NaNbO3 crystals had an average length of 15 μm and a thickness of 0.5 μm. Scanning electron microscope and high-resolution transmission electron microscope analyses indicated that the retro-synthesis process of the desired perovskite NaNbO3 retained the morphological and structural features of the BNN5 precursor. It may be possible to synthesize other perovskite-structured templates using the same method. |
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