Enhanced electrical properties of textured NBBT ceramics derived from the screen printing technique

Author

Wu, Mengjia ; Wang, Youliang ; Wang, Dong ; Li, Yongxiang

Author_Institution

Key Lab. of Inorg. Functional Mater. & Devices, Chinese Acad. of Sci., Shanghai, China

Volume

58

Issue

10

fYear

2011

fDate

10/1/2011 12:00:00 AM

Firstpage

2036

Lastpage

2041

Abstract

(001)_pc-oriented (Na_0.5Bi_0.5)_0.94Ba_0.06TiO₃ (NBBT) lead-free piezoelectric ceramics were fabricated by the screen printing technique using Na_0.5Bi_0.5TiO₃ (NBT) templates. The plate-like NBT template particles were synthesized from bismuth layer-structured ferroelectric Bi₄Ti₃O₁₂ (BiT) precursors by the topochemical method. The screen printed NBBT ceramics with 20 wt% NBT templates contained a large fraction of grains aligned with their c-axis normal to the sample surface, giving a Lotgering factor of 0.486. The dielectric and ferroelectric properties of textured NBBT ceramics were anisotropic. Compared with the non-textured NBBT ceramics, the dielectric, ferroelectric, and piezoelectric properties of the textured NBBT ceramics were improved, giving a dielectric constant ε^T₃₃/ε₀ T of 910, a remnant polarization P_r of 29.2 μC/cm², a coercive field E_c of 23.5 kV/cm, a piezoelectric coefficient d₃₃ of 180 pC/N, and a thickness-mode electromechanical coupling coefficient k_tof 0.485.

Keywords

barium compounds; bismuth compounds; dielectric polarisation; ferroelectric ceramics; ferroelectric coercive field; permittivity; piezoceramics; piezoelectricity; sodium compounds; texture; (Na_0.5Bi_0.5)_0.94Ba_0.06TiO₃; Lotgering factor; NBBT lead-free piezoelectric ceramics; bismuth layer-structured ferroelectric BiT precursors; coercive field; dielectric constant; dielectric properties; enhanced electrical properties; ferroelectric properties; piezoelectric coefficient; piezoelectric properties; plate-like NBT template particles; remnant polarization; screen printed NBBT ceramics; screen printing technique; textured NBBT ceramics; thickness-mode electromechanical coupling coefficient; topochemical method; Ceramics; Crystals; Dielectric constant; Printing; Temperature measurement;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2011.2053

Filename

6039993