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팜키남,딘치힌,이현영,공영민,이재신,Pham, Ky Nam,Dinh, Thi Hinh,Lee, Hyun-Young,Kong, Young-Min,Lee, Jae-Shin 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.3
The effect of $Bi(Mg_{1/2}Sn_{1/2})O_3$ (BMS) modification on the crystal structure, ferroelectric and piezoelectric properties of $Bi_{1/2}(Na_{0.8}K_{0.2})_{1/2}TiO_3$ (BNKT) ceramics has been investigated. The BMS-substitution induced a transition from a ferroelectric (FE) tetragonal to a nonpolar pseudocubic phase, leading to degradations in the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the electric-field-induced strain was significantly enhanced by the BMS substitution-induced phase transition and reached a highest value of $S_{max}/E_{max}$ = 633 pm/V under an applied electric field of 6 kV/mm when the BMS content reached 6 mol%. The abnormal enhancement in strain was attributed to the field-induced transition of the pseudocubic symmetry to other asymmetrical structure, which was not clarified in this work.
(K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub> 세라믹스의 압전 특성에 대한 Ta 도핑 효과
강진규,이용희,허대준,이현영,딘치힌,이재신,Kang, Jin-Kyu,Lee, Yong-Hui,Heo, Dae-Jun,Lee, Hyun-Young,Dinh, Thi Hinh,Lee, Jae-Shin 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.5
We investigated the effect of Ta doping on the dielectric and piezoelectric properties of lead-free $(K_{0.5}Na_{0.5})NbO_3$ ceramics prepared using a conventional ceramic processing. X-ray diffraction analysis revealed that Ta was perfectly substituted into Nb-sites in the range of 0 to 20 at%. As Ta content in the KNN increased, the sinterability of KNN ceramics was significantly degraded while the Ta doping enhanced the piezoelectric constant $d_{33}$, planar mode piezoelectric coupling coefficient ($k_p$), and electromechanical quality factor ($Q_m$). The highest values for $d_{33}$, $k_p$, and $Q_m$ was found to be 156 pC/N, 0.37, and 155, respectively.