Title :
Influence of sintering temperature on phase structure and electrical properties of Mg-doped (Li, Na, K)NbO3 lead-free piezoelectric ceramics
Author :
Li, Hai-Tao ; Zhang, Qian ; Qian Zhang ; Zhao, Gao-Lei ; Cui, Min
Author_Institution :
Sch. of Mater. Sci. & Eng., Univ. of Sci. & Technol., Beijing, China
Abstract :
Mg-doped (Li, Na, K)NbO3 lead-free piezoelectric ceramics with a nominal composition of [Li0.06(Na0.5K0.5)0.94](Nb0.198Mg0.005)O3 (LNKNM) was prepared by normal sintering method. The microstructure and electrical properties were studied with a special emphasis on the influence of sintering temperature in the range of 920-1020degC. A MPB bridging tetragonal and orthorhombic symmetry was found as the sintering temperature was raised from 980 to 1000degC, whereby enhanced electrical properties were obtained. The highest d33, kp, TC, and Pr were 238 pC/N, 41.5%, 470degC, and 38.2 muC/cm2, respectively.
Keywords :
crystal symmetry; dielectric hysteresis; dielectric losses; dielectric polarisation; doping profiles; grain size; lithium compounds; magnesium; permittivity; piezoceramics; potassium compounds; sintering; sodium compounds; Mg-doped lead-free piezoelectric ceramics; [Li0.06(Na0.5K0.5)0.94](Nb0.198Mg0.005)O3; dielectric constant; dielectric loss; electrical properties; grain size; microstructure; normal sintering method; orthorhombic symmetry; phase structure; polarization hysteresis loops; temperature 920 C to 1020 C; tetragonal symmetry; Decision support systems; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 2009. ISAF 2009. 18th IEEE International Symposium on the
Conference_Location :
Xian
Print_ISBN :
978-1-4244-4970-5
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2009.5307592
