Abstract
• Precursor particles with acicular morphology were hydrothermally synthesized. • The growth temperature effects the particle morphology, composition and structure. • Particles can be fully transformed to NaNbO 3 while retaining their morphology. • Acicular NaNbO 3 particles were used as templates in the fabrication of KNN fibers. Sodium niobate – NN (NaNbO 3 ) powders were synthesized by hydrothermal process to be used as template particles in the fabrication of textured lead free piezoelectric ceramics. Sodium hexaniobate–Na 8 Nb 6 O 19 ⋅13H 2 O particles with rod-like morphology were synthesized at 120 °C. Particles with needle-like morphology and Na 2 (Nb 2 O 6 )(H 2 O) phase started to form at temperatures of 130 °C and above. Synthesis at 150 °C yields particles with totally needle-like morphology and consisting entirely of the Na 2 (Nb 2 O 6 )(H 2 O) phase. Sodium niobate–NaNbO 3 particles with cubic morphology were synthesized at temperatures of 160 °C and above. Rod-like and needle-like morphology was retained even after annealing at 400 °C for 1 h. A preliminary study was also done to integrate these anisometric template particles in the preparation of textured potassium sodium niobate (KNN) fibers.
Published Version
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