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KenichiKakimoto,Lien Thi-Kim Nguyen,Yusuke Hayakawa,Yuya Shinkai,Isao Kagomiya 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Preparation of alkali niobate ceramic powder of KNbO_3, (Na,K)NbO_3, and (Li,Na,K)NbO_3 has been carried out by using a citrate-based liquid precursor route which was a newly developed innovative wet powder processing technique. The derived powder showed a well-sinterable property and the sintered ceramics demonstrated excellent ferroelectric property. Orthorhombic KNbO_3 showed a remanent polarization (P_r) of 23.3 μC/cm^2 and coercive field (E_c) of 7.8 kV/cm, and (Na,K)NbO_3 showed a P_r of 31.4 μC/cm^2 and E_c of 17.3 kV/cm. On the other hand, tetragonal (Li,Na,K)NbO_3 demonstrated Pr of 19.0 μC/cm^2 and Ec of 13.6 kV/cm. The citrate liquid precursor route demonstrated a good potential for the synthesis of fine powders for lead-free alkaline niobate ceramics.