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

fYear

2009

fDate

23-27 Aug. 2009

Firstpage

1

Lastpage

5

Abstract

Mg-doped (Li, Na, K)NbO₃ lead-free piezoelectric ceramics with a nominal composition of [Li_0.06(Na_0.5K_0.5)_0.94](Nb_0.198Mg_0.005)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, k_p, T_C, and P_r 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; [Li_0.06(Na_0.5K_0.5)_0.94](Nb_0.198Mg_0.005)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;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 2009. ISAF 2009. 18th IEEE International Symposium on the

Conference_Location

Xian

ISSN

1099-4734

Print_ISBN

978-1-4244-4970-5

Electronic_ISBN

1099-4734

Type

conf

DOI

10.1109/ISAF.2009.5307592

Filename

5307592