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J. Korean Ceram. Soc. > Volume 57(4); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(4): 440-446.
doi: https://doi.org/10.1007/s43207-020-00042-z
Synthesis and characterization of MnO2 added ( Na0.475K0.475Li0.05) (Nb0.9Ta0.05Sb0.05)O3 lead‑free piezoelectric ceramics
Jae Min Cha, Jeong Woo Lee, Byeonghoon Bae, Yong Jeong Jeong, Chang‑Bun Yoon
Department of Advanced Materials Engineering, Korea Polytechnic University, Siheung‑si, Gyeonggi‑do 15073, Korea
Correspondence  Chang‑Bun Yoon ,Email: cbyoon@kpu.ac.kr
Received: February 17, 2020; Revised: February 17, 2020   Accepted: March 17, 2020.  Published online: April 30, 2020.
ABSTRACT
Lead-free NKLNTS ceramics with promising piezoelectric properties were fabricated using the solid phase method, which is a general ceramic manufacturing method. MnO2 was added to NKLNTS ceramics as a sintering aid to improve piezoelectric and dielectric properties. The added MnO2 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 diffraction analysis (XRD) was performed to confirm the crystallinity of the sintered body, and piezoelectric and dielectric properties were evaluated using a d33-meter and an impedance analyzer. When 0.1 wt% of MnO2 was added, it was confirmed 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 MnO2 was added, piezoelectric and dielectric properties were decreased due to the decreased density. When NKLNTS-0.1wt% MnO2 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 d33 = 271 pC/N, k p = 0.40, ε r = 1250, tan δ = 2.5%, and T c = 348 °C were fabricated.
Key words: NKN ceramics · MnO2 · PZT · Perovskite · Accepter · Piezoelectric · Lead-free
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