Shiraishi Takahisa, Einishi Hiro, Yasui Shintaro, Ishikawa Mutsuo, Hasegawa Tomohito, Kurosawa Minoru, Uchida Hiroshi, Sakashita Yukio, Funakubo Hiroshi
Jpn J Appl Phys 50(9) 09ND11-09ND11-4 2011年9月25日
Films of solid solution in KNbO3--NaNbO3(KNN) were deposited at 240 °C on (100)\text{cSrRuO3$\varparallel$(100)SrTiO3substrates by the hydrothermal method. (KxNa1-x)NbO3films with $x = 0{\mbox{-- } }1.0$ were synthesized by changing the fraction of KOH in a solution of KOH and NaOH. The $x$ in (KxNa1-x)NbO3continuously changed with the volume fraction of KOH, while the deposition amount strongly depended on $x$. Epitaxial films with {100} orientation were obtained in the entire composition range and their out-of-plane lattice spacing changed with $x$. All the films showed ferroelectricity and their remanent polarization became larger than what above $x = 0.58$.