Effect of MnO2 Addition on Dielectric and Piezoelectric Properties of 0.985[Li0.04(Na0.545K0.46)0.96(Nb0.81Ta0.15Sb0.04)]O3 Ceramics

MnO2 첨가가 0.985[Li0.04(Na0.545K0.46)0.96(Nb0.81Ta0.15Sb0.04)]O3+0.015KNbO3 세라믹스의 유전 및 압전 특성에 미치는 영향

  • Kim, YouSeok (Department of Electrical Engineering, Semyung University) ;
  • Yoo, JuHyun (Department of Electrical Engineering, Semyung University)
  • Received : 2014.04.24
  • Accepted : 2014.05.13
  • Published : 2014.06.01


$MnO_2$-doped $0.985[Li_{0.04}(Na_{0.545}K_{0.46})_{0.96}(Nb_{0.81}Ta_{0.15}Sb_{0.04})]O_3+0.015KNbO_3(0.985LNKNTS+0.015KNbO_3)$ lead-free ceramics were fabricated by conventional solid state method to develop excellent dielectric and piezoelectric properties. The result of X-ray diffraction patterns obviously indicated that all of the specimen has pure perovskite structure without secondary phase. In addition, orthorhombic phase and coexistance region of orthorhombic-tetragonal phase (MPB) were observed with amount of $MnO_2$. The optimal values of ${\rho}$=4.70 $g/cm^3$, $d_{33}=238$ pC/N, $k_P=0.46$, $Q_m=121$, ${\varepsilon}_r=849$, and $T_C=225^{\circ}C$ were obtained at 0.01 mol% $MnO_2$ doped $0.985LNKNTS+0.015KNbO_3$ ceramics sintered at $990^{\circ}C$ for 5 h, respectively. Hence, it was indicated that the suitable amount of $MnO_2$ could improve the electrical properties of $0.985[Li_{0.04}(Na_{0.545}K_{0.46})_{0.96}(Nb_{0.81}Ta_{0.15}Sb_{0.04})]O_3+0.015KNbO_3$ ceramics.


  1. Y. Saito, H. Takao, T. Tani, T, Nonoyama, K. Takatori, T. Homma, T. Nahaya, and M. Nakamura, Nature, 432, 84 (2004).
  2. S. M. Byeon and J. H. Yoo, Ferroelectric, 425, 98 (2011).
  3. K. S. Lee, Y. S. Kim, S. H. Shin, and J. H. Lee, Ferroelectric, 460, 179 (2014).
  4. H. Y. Park, C. W. Ahn, H. C. Song, J. H. Lee, and S. Nahm, Appl. Phys. Lett., 89, 062906 (2006).
  5. H. Y. Park, K. H. Cho, D. S. Paik, and S. Nahm, J. Appl. Phys., 102, 124101 (2007).
  6. M. H. Park, J. H. Yoo, and Y. W. Park, J. Electroceram., 30, 66 (2013).
  7. I. T. Seo, C. H. Choi, M. S. Jang, B. Y. Kim, G. Han, S. Nahm, K. H. Cho, and J. H. Paik, Sens. Actuators. A, 200, 47 (2013).
  8. D. Lin, K. W. Kwok, and H. L. W. Chan, Mater. Chem. Phys., 109, 455 (2008).
  9. Y. S. Kim, J. H. Yoo, J. I. Hong, and J. Y. Lee, J. KIEEME, 26, 806 (2013).
  10. J. R. Noh, J. H. Yoo, and S. D. Lee, J. KIEEME, 26, 204 (2013).