0.85NaNbO3-0.15LiNbO3 세라믹스의 구조 및 전기적 특성
Structure and Electrical Properties of 0.85NaNbO3-0.15LiNbO3 Ceramics
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Structure and electrical properties of 0.85NaNbO3-0.15LiNbO3 ((Li0.15Na0.85)NbO3) ceramics were investigated as a function of sintering temperature. (Li0.15Na0.85)NbO3 ceramics were prepared by conventional solid state processing. A main phase of the orthorhombic perovskite structure and secondary phase of LiNbO3 were confirmed for all sintered specimens. Dense (Li0.15Na0.85)NbO3 ceramics were obtained at sintering temperature above 1050oC. With increasing sintering temperature, the electromechanical coupling factor (kp), piezoelectric constant (d33) and relative dielectric constant (εr) of the sintered specimens increased, while the mechanical quality factor (Qm) decreased. These results are due to the increase of grain size and crystallite size of orthorhombic perovskite structure. Based on the temperature dependence of εr, stable piezoelectric properties were expected because no phase transition found up to 300oC. Typically, kp of 18%, d33 of 34.7 pC/N, εr of 135, and Qm of 62.8 were obtained for the specimens sintered at 1200oC for 5 h.
Abstract
Structure and electrical properties of 0.85NaNbO3-0.15LiNbO3 ((Li0.15Na0.85)NbO3) ceramics were investigated as a function of sintering temperature. (Li0.15Na0.85)NbO3 ceramics were prepared by conventional solid state processing. A main phase of the orthorhombic perovskite structure and secondary phase of LiNbO3 were confirmed for all sintered specimens. Dense (Li0.15Na0.85)NbO3 ceramics were obtained at sintering temperature above 1050oC. With increasing sintering temperature, the electromechanical coupling factor (kp), piezoelectric constant (d33) and relative dielectric constant (εr) of the sintered specimens increased, while the mechanical quality factor (Qm) decreased. These results are due to the increase of grain size and crystallite size of orthorhombic perovskite structure. Based on the temperature dependence of εr, stable piezoelectric properties were expected because no phase transition found up to 300oC. Typically, kp of 18%, d33 of 34.7 pC/N, εr of 135, and Qm of 62.8 were obtained for the specimens sintered at 1200oC for 5 h.
참고문헌 (15)
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