Abstract
Perovskite-type KNbO 3 powder was prepared by hydrothermal reaction using Nb 2O 5 in KOH solution. A single phase of KNbO 3 was obtained when the molar ratio of KOH/Nb 2O 5 was above 20 and the reaction temperature was above 160 °C. Three types of KNbO 3 powder with the orthorhombic, tetragonal and cubic symmetries were obtained, depending on the reaction temperature and the ratio of KOH/Nb 2O 5. The molar ratios of K/Nb in the cubic and tetragonal phases were 0.91 and 0.94, respectively and that of the orthorhombic one was 0.98, and the mass loss was observed in the TG curves of tetragonal and cubic phases. The tetragonal and cubic phases were stabilized by OH − and adsorbed water.
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