Title :
Fabrication of lead-free ferroelectric (Na,K)NbO3 thin films by pulsed laser deposition
Author :
Nakao, Tomoki ; Koyama, N. ; Fujii, Ichiro ; Wada, Tomotaka
Author_Institution :
Dept. of Mater. Chem., Ryukoku Univ., Otsu, Japan
Abstract :
We fabricated (Na1-xKx)NbO3 (NKN) thin films with x=0.1 (NKN10), 0.2 (NKN20) and 0.3 (NKN30) on SrTiO3 (STO) substrate by pulsed laser deposition (PLD). NKN ceramics were prepared by modified solid-state reaction method, and NKN thin films were fabricated using this ceramics target by PLD. The NKN films were epitaxially grown on (001), (110) and (111) STO substrates. The NKN films on (001) STO had a smooth surface, the films on (110) STO had a striped pattern, and the films on (111) STO had trigonal pyramid-like structure. It was observed that remanent polarizations of the films increased with increasing K content. The P-E hysteresis of NKN30 film on (111) STO substrate showed a very large hysteresis loop with a remanent polarization Pr of 69 μC/cm2.
Keywords :
dielectric hysteresis; dielectric polarisation; epitaxial growth; ferroelectric ceramics; ferroelectric thin films; potassium compounds; pulsed laser deposition; sodium compounds; (001) SrTiO3 substrate; (110) SrTiO3 substrate; (111) SrTiO3 substrate; (Na1-xKx)NbO3; NKN ceramics; P-E hysteresis loop; PLD; SrTiO3; epitaxial growth; lead-free ferroelectric thin films; pulsed laser deposition; remanent polarizations; solid-state reaction method; trigonal pyramid-like structure; Epitaxial growth; Piezoelectric polarization; Substrates; X-ray scattering; (Na, K)NbO3; PLD; ferroelectric; lead-free; thin film;
Conference_Titel :
Applications of Ferroelectric and Workshop on the Piezoresponse Force Microscopy (ISAF/PFM), 2013 IEEE International Symposium on the
Conference_Location :
Prague
DOI :
10.1109/ISAF.2013.6748684
