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합성방법과 소결 온도가 PZNN-PZT 압전 세라믹스 소재특성에 미치는 영향
김소원,정용정,이희철,Kim, So Won,Jeong, Yong Jeong,Lee, Hee Chul 한국분말재료학회 (*구 분말야금학회) 2018 한국분말재료학회지 (KPMI) Vol.25 No.6
The impact of different mixing methods and sintering temperatures on the microstructure and piezoelectric properties of PZNN-PZT ceramics is investigated. To improve the sinterability and piezoelectric properties of these ceramics, the composition of $0.13Pb((Zn_{0.8}Ni_{0.2})_{1/3}Nb_{2/3})O_3-0.87Pb(Zr_{0.5}Ti_{0.5})O_3$ (PZNN-PZT) containing a Pb-based relaxor component is selected. Two methods are used to create the powder for the PZNN-PZT ceramics. The first involves blending all source powders at once, followed by calcination. The second involves the preferential creation of columbite as a precursor, by reacting NiO with $Nb_2O_5$ powder. Subsequently, PZNN-PZT powder can be prepared by mixing the columbite powder, PbO, and other components, followed by an additional calcination step. All the PZNN-PZT powder samples in this study show a nearly-pure perovskite phase. High-density PZNN-PZT ceramics can be fabricated using powders prepared by a two-step calcination process, with the addition of 0.3 wt% MnO2 at even relatively low sintering temperatures from $800^{\circ}C$ to $1000^{\circ}C$. The grain size of the ceramics at sintering temperatures above $900^{\circ}C$ is increased to approximately $3{\mu}m$. The optimized PZNN-PZT piezoelectric ceramics show a piezoelectric constant ($d_{33}$) of 360 pC/N, an electromechanical coupling factor ($k_p$) of 0.61, and a quality factor ($Q_m$) of 275.
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Cha Jae Min,Lee Jeong Woo,Bae Byeonghoon,정용정,Yoon Chang-Bun 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.4
Lead-free NKLNTS ceramics with promising piezoelectric properties were fabricated using the solid phase method, which is a general ceramic manufacturing method. MnO 2 was added to NKLNTS ceramics as a sintering aid to improve piezoelectric and dielectric properties. The added MnO 2 content was adjusted to 0, 0.1, 0.3, 0.5, and 0.7 wt%, the powder was calcined at 900 °C for 2 h, and then the sintering temperature was changed from 1000 to 1100 °C to study the optimum temperature and composition that yields excellent piezoelectric properties and sinterability. Archimedes method and scanning electron microscope (SEM) were used to evaluate the sinterability, X-ray diff raction analysis (XRD) was performed to confi rm the crystallinity of the sintered body, and piezoelectric and dielectric properties were evaluated using a d 33 -meter and an impedance analyzer. When 0.1 wt% of MnO 2 was added, it was confi rmed that density was the highest at the sintering temperature of 1050 °C and had excellent piezoelectric and dielectric properties. When 0.3 wt% or more of MnO 2 was added, piezoelectric and dielectric properties were decreased due to the decreased density. When NKLNTS-0.1wt% MnO 2 was sintered at a sintering temperature of 1050 for 2 h, it had a density of about 97%. Furthermore, lead-free piezoelectric ceramics with excellent piezoelectric and dielectric properties of d 33 = 271 pC/N, k p = 0.40, ε r = 1250, tan δ = 2.5%, and T c = 348 °C were fabricated.
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