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Hydrothermal (K1−xNax)NbO3 Lead-free Piezoelectric Ceramics
Takafumi Maeda,Norihito Takiguchi,Takeshi Morita,Mutsuo Ishikawa,Tobias Hemsel 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41
As a lead-free piezoelectric ceramic, (K,Na)NbO3 is a promising material because of its good piezoelectric properties. In this study, (K1−xNax)NbO3 ceramics were synthesized from a mixture of KNbO3 and NaNbO3 powders prepared by using the hydrothermal reaction. The hydrothermal reaction enables the production of high quality powders for the ceramic fabrication process. To obtain (K1−xNax)NbO3 ceramics, the KNbO3 and the NaNbO3 powders were mixed and sintered together. X-Ray diffraction analysis revealed that the solid solution ceramic (K1−xNax)NbO3 was formed by the sintering process. The K/Na ratio in the (K1−xNax)NbO3 ceramic was optimized for the best piezoelectric properties. The optimized form was (K0.48Na0.52)NbO3, which showed the following piezoelectric properties: k33 = 0.56 and d33 = 114 pC/N. In addition, the ferroelectric properties Pr = 7.72 μC/cm2, Ec = 857 V/mm, and Tc = 420 ℃ were measured.
Takahisa Shiraishi,Hiro Einishi,Shintaro Yasui,Hiroshi Funakubo,Tomohito Hasegawa,Minoru Kurosawa,Mutsuo Ishikawa,Hiroshi Uchida,Yukio Sakashita,김상수,송태권,도달현,김명호 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
(K0.88Na0.12)NbO3 (KNN) thick films with various thicknesses were prepared on Ni-based metal substrates by hydrothermal method. Although the deposition of KNN films was hardly observed directly on metal substrates until 12 h, the amount of KNN films deposited on both SrRuO3/LaNiO3- and SrRuO3-covered Ni based metal substrates increased to about 5 μm with increasing deposition time above 3 h. X-ray diffraction studies confirmed the formation of {100}c- and randomly-oriented KNN films on SrRuO3/LaNiO3- and SrRuO3-covered metal substrates, respectively. Ferroelecctric property studies revealed an improved remanent polarization and an improved piezoelectric response of {100}c-oriented KNN films over the randomly-oriented KNN films. In addition, the values for {100}c-oriented KNN films were similar to those of {100}c-oriented epitaxial KNN films prepared on (100)cSrRuO3//SrTiO3 substrates.