Phase Evolution and Surface Morphology of Niobate Hydrate Template Nanoparticles Synthesized by Hydrothermal Method

Abstract:

In this work, an alternative approach to synthesize (K,Na)NbO₃ (KNN) particles is investigated. KNN hydrate particles were prepared by hydrothermal method in a mixed alkaline solution with different KOH/(KOH+NaOH) ratios , and phase structure as well as surface morphology of these niobate hydrate particles were systematically studied. For the reaction rate of Na⁺ is faster than K⁺, a mixed alkaline solution with K⁺/Na⁺ changing from 4/1 to 5/1was required as a starting solution so a to obtain KNN hydrate particles with K/Na=1. Besides, the results show that particle size of KNN hydrate particles synthesized in different starting solution is dependent on K⁺/Na⁺ of the starting solution, and grain size of as-sintered KNN ceramics through hydrothermal method decreases sharply.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 105-108
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.105
• Online since: July 2016
• Authors: Yuan Yu Wang, Nuo Xin Xu, Jin Zhuang Liu, Qi Long Zhang, Hui Yang
• Keywords: (K,Na)NbO₃, Hydrate Particles, Hydrothermal Synthesis, K⁺/Na⁺

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