http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
BNKZ치환된 (Na,K)NbO<sub>3</sub>계 세라믹스의 미세구조 및 압전 특성
한종대,류주현,Han, Jong-Dae,Yoo, Ju-Hyun 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.10
In this study, $(1-x)(Na_{0.52}K_{0.443}Li_{0.037})(Nb_{0.883}Sb_{0.08}Ta_{0.037})O_3-x(Bi_{0.5}(Na_{0.7}K_{0.3})_{0.5}ZrO_3$ ceramics were fabricated by BNKZ substitution using a conventional solid-state method to develop excellent lead-free piezoelectric ceramics for piezoelectric actuators; their dielectric and piezoelectric properties were then investigated. All specimens were in the orthorhombic phase. $NKL-NSTO_3$ ceramics with x=0.01 showed excellent piezoelectric properties. The density (${\rho}$), piezoelectric charge constant ($d_{33}$), planar piezoelectric coupling coefficient ($k_p$), mechanical quality factor ($Q_m$), and dielectric constant (${\varepsilon}_r$) had optimized values of $4.56g/cm^3$, 208 pC/N, 0.43, 96, and 975, respectively.
[Bi<sub>0.5</sub>(Na<sub>0.84</sub>K<sub>0.16</sub>)<sub>0.5</sub>]TiO<sub>3</sub> 무연 세라믹스의 전기열량 효과
한종대,류주현,정영호,Han, Jong-Dae,Yoo, Ju-Hyun,Jeong, Yeong-Ho 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.4
In this work, in order to develop the ceramics with an excellent electrocaloric effect, $[Bi_{0.5}(Na_{0.84}K_{0.16})_{0.5}]TiO_3$ ceramics were fabricated by conventional solid state reaction method. The ceramics was observed as rhombohedral phase by X-ray diffraction patterns. To investigate the electrocaloric effect of the ceramics, P-E hysteresis loops were measured at various temperature. The temperature change ${\Delta}T$ of these ceramics was calculated using the Maxwell's relations. The maximum value of temperature change ${\Delta}T$ was obtained as 0.3 $1^{\circ}C$ at $165^{\circ}C$ under applied electric fields 45 kV/cm.
(Bi<sub>0.5</sub>Na<sub>0.5</sub>)TiO<sub>3</sub> 세라믹스의 유전 및 전기열량 특성
한종대,류주현,정영호,Han, Jong-Dae,Yoo, Ju-Hyun,Jeong, Yeong-Ho 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.5
The electrocaloric effect in $0.94(Bi_{0.5}Na_{0.5})TiO_3+0.06KNbO3+0.9wt%$ G.F.ferroelectricceramics was observed in terms of the temperature change (${\Delta}T$) of the fabricated ceramics, Curie temperature $T_c$, and applied electric field. The specimens were fabricated by a conventional solid-state reaction. $T_c$ appeared near $165{\sim}170^{\circ}C$. The P-E hysteresis showed a tendency to slim down with a temperature increase and finally was slimmest near $150^{\circ}C$. With the increase of temperature, the polarization revealed a gradual decrease, and a sharp decline near $T_c$. When an electric field of 45 kV/cm was applied, the largest polarization was shown. The maximum value of the temperature change (${\Delta}T=0.31^{\circ}C$) was obtained at $165^{\circ}C$ under an applied electric field of 45 kV/cm.
음향 방출 센서용 Pb(Zn,Ni,Nb)O<sub>3</sub>-Pb(Zr,Ti)O<sub>3</sub> 세라믹스의 유전 및 압전 특성
한종대,류주현,정회승,서동희,Han, Jong-Dae,Yoo, Ju-Hyun,Jeong, Hoy-Seung,Seo, Dong-Hir 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.8
In this study, in order to develop composition ceramics for Acoustic Emission (abbreviated as AE) sensor application, the PZT system ceramics was fabricated by conventional solid state reaction method. When x=0.48, the density, electromechanical coupling factor($k_p$), piezoelectric coefficient $d_{33}$ and piezoelectric voltage constant $g_{33}$ of the maximum values of $7.857g/cm^3$, 0.51, 190[pC/N], 52[$10^{-3}mV/N$] were obtained, respectively, suitable for AE sensor.