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Preparation of Morphology‐Controlled Plate‐Like Sodium Niobate Particles by Hydrothermal Synthesis
Author(s) -
Lu Yao,
Karaki Tomoaki,
Fujii Tadashi
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13512
Subject(s) - calcination , morphology (biology) , hydrothermal circulation , materials science , hexagonal crystal system , hydrothermal synthesis , mineralogy , chemical engineering , molten salt , hexagonal phase , nanotechnology , crystallography , chemistry , metallurgy , geology , catalysis , paleontology , biochemistry , engineering
Sodium niobate (NaNbO 3 ) particles with plate‐like morphology and hexagonal unit cells were prepared by the hydrothermal method. The result of SEM showed that the hexagonal NaNbO 3 were characterized by plate‐like morphology with a diameter of 5–15 μm and a thickness of 1–2 μm. The crucial influences on the morphology and crystal phase of the NaNbO 3 , such as concentration of [OH − ], surfactant, and K + :Na + ratio, were established. By further calcination treatment, the plate‐like hexagonal NaNbO 3 particles could be completely transformed into perovskite structure without morphology change. The XRD and EBSD results indicate that the major face of the calcined particles is parallel to the crystallographic (001) pc (pseudo cubic index) plane. Compared with the traditional high‐temperature molten salt method, this work provides a simpler way to prepare the template for fabricating textured ceramics.