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The different crystal orientations of NaNbO 3  microcrystalline powders were synthesized by the molten-salt growth method with different precursors. The plate-like (001)-NaNbO 3  orthogonal powders were synthesized by topochemical conversion using Bi 2.5 Na 3.5 Nb 5 O 18  as precursor particles. The tabular NaNbO 3  template particles were about 0.5–1 μm in thickness and about 15–25 μm in length. The rod-like (101)-NaNbO 3  orthogonal powders were fabricated with Nb 2 O 5  as a precursor. The preparation of Nb 2 O 5  precursors required two processes: the molten salt method and the ion exchange method, respectively. The rod-like (101)-NaNbO 3  orthogonal powders were about 0.6 μm in average diameter, and 8 μm in average length. The plate-like and rod-like orthogonal NaNbO 3  powders had high aspect ratios. The diffraction peaks of plate-like NaNbO 3  correspond to standards card JCPDS-33-1270, and its space group was Pbma. The crystal cell of Pbma NaNbO 3  was a typical antiferroelectric structure. The diffraction peaks of rod-like NaNbO 3  correspond to standard card JCPDS-86-0606, and its space group was P2lmc. The cell structure of P2lmc NaNbO 3  was a typical ferroelectric structure.

ferroelectrics

Preparation technology and crystal structure analysis of NaNbO 3  microcrystalline powders with different crystal orientations and morphologies by molten salt method