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Jung Rag Yoon,Chang-Bae Lee,이석원,이헌용 한국전기전자재료학회 2012 Transactions on Electrical and Electronic Material Vol.13 No.6
(1-X)(Na0.5K0.5)NbO3-XK5.4Cu1.3Ta10O29 (NKN-KCT) lead-free piezoelectric ceramics have been synthesized by the conventional solid state sintering method, and their sinterability and piezoelectric properties were investigated. Typically, this material is sintered between 1,025 and 1,100℃ for 2 hours to achieve the required densification. Crystalline structures and Microstructures were analyzed by X-ray diffraction and scanning electron microscope. The density, dielectric constant (εr), piezoelectric constant d33, electromechanical coupling factor kp and mechanical quality factor Qm value of the NKN ceramics depended upon the KCT content and the sintering temperature. In particular, the KCT addition to NKN greatly improved the mechanical quality factor Qm value. The ceramic with X =1.0 mol% sintered at 1,050℃ exhibited optimum properties (εr= 246, d33= 95, kp= 0.38 and Qm= 1,826). These results indicate that the ceramic is a promising candidate material for applications in lead free piezoelectric transformer and filter materials.
(Ba, Ca)(TiZr)O₃ 세라믹을 적용한 적층 칩 커패시터의 전기적 특성
尹重洛(Jung-Rag Yoon),余東勳(Dong-Hun Yeo),李憲用(Heun-Young Lee),李錫原(Suk Won Lee) 대한전기학회 2006 전기학회논문지C Vol.55 No.1
The effect of A/B mol ratios and sintering temperatures on dielectric properties and microstructure of (Ba<SUB>0.93</SUB>Ca<SUB>0.07</SUB>)m(Ti<SUB>0.82</SUB>Zr<SUB>0.18</SUB>)O₃ ceramics were investigated. The dielectric constant decreased with increasing the A/B mol ratio. However, the dielectric loss is improved. As the dielectric properties of A/B mol ratio with m = 1.009 at sintered temperature 1260℃, we obtained dielectric constant 12,800, dielectric loss 3.5% and Y5V temperature characteristics. Highly reliable Ni-MLCCs, 1.6㎜ (length) × 0.8㎜ (width) × 0.8㎜ (height) with capacitance of 1.23 ㎌ and dissipation loss of 5.2% were obtained employing dielectric material composed of (Ba<SUB>0.93</SUB>Ca<SUB>0.07</SUB>)1.009(Ti<SUB>0.82</SUB>Zr<SUB>0.18</SUB>)O₃ - MnO₂ 0.2wt% - Y₂O₃ 0.18wt%. - SiO₂ 0.15wt% - (Ba<SUB>0.4</SUB>Ca<SUB>0.6</SUB>)SiO₃ 1 wt%.