Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
Regular Issue: Full papers
Solvothermal synthesis of dispersible homogeneous KNbO3 nanocubes from K4Nb6O17 microsheets
Yuma YamadaPiyush SapkotaHyunwook NamErika YamagaRyoichi KunisadaTakahiro TakeiNobuhiro KumadaIchiro FujiiSatoshi WadaShintaro Ueno
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2023 Volume 131 Issue 7 Pages 306-312


The morphology- and size-controlled syntheses of KNbO3 nanoparticles, which are demanded by ferroelectric and piezoelectric applications, have been attempted by hydrothermal and solvothermal methods in the typical Nb2O5–KOH reaction systems, but the resultant KNbO3 nanoparticles generally had a wide particle size distribution and formed severe aggregations. In this study, dispersible homogeneous KNbO3 nanocubes were synthesized from layered potassium niobate, K4Nb6O17, by the solvothermal method. The K4Nb6O17 microsheets could be completely converted into KNbO3 at the lower K/Nb atomic ratio as compared to the Nb2O5 nanoparticles because it requires a relatively minor rearrangement of NbO6-unit network in K4Nb6O17 to form the KNbO3 nuclei. The homogeneous KNbO3 nanocubes with the ferroelectric orthorhombic phase were obtained at the higher K/Nb atomic ratio, and their colloidal suspensions were stabilized by the electrostatic repulsion between the negatively charged surfaces of the KNbO3 nanocubes.

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