Dielectric and Piezoelectric Properties of 0.97(Na0.52K0.443Li0.037)(Nb0.96-xSb0.04Tax)O3–0.03(Bi0.5Na0.5)0.9(Sr)0.1ZrO3 Ceramics for Pizoelectric Actuator

• Published in: Transactions on electrical and electronic materials Vol. 20; no. 4; pp. 328 - 333
• Main Authors: Cho, Sungjin, Yoo, Ju-Hyun, Jeong, Yeong-Ho
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Electrical and Electronic Material Engineers (KIEEME) 07.08.2019
• Subjects: Chemistry and Materials Science; Electronics and Microelectronics; Instrumentation; Materials Science; Optical and Electronic Materials; Regular Paper; Tetragonal; Piezoelectric actuator; Qm; kp; Rhombohedral
• ISSN: 1229-7607; 2092-7592
• DOI: 10.1007/s42341-019-00115-9

In this study, 0.97(Na 0.52 K 0.443 Li 0.037 )(Nb 0.96-x Sb 0.04 Ta x )O 3 –0.03(Bi 0.5 Na 0.5 ) 0.9 (Sr) 0.1 ZrO 3 ceramics were fabricated as a function of Ta substitution by conventional solid state method in order to develop the excellent composition ceramics for piezoelectric actuator, and their dielectric and piezoelectric properties were investigated. As the chemical composition results of 0.97(Na 0.52 K 0.443 Li 0.037 )(Nb 0.96-x Sb 0.04 Ta x )O 3 –0.03(Bi 0.5 Na 0.5 ) 0.9 (Sr) 0.1 ZrO 3 system, we obtained the following results: When Ta was substituted for the ceramics, all the ceramics possessed a perovskite structure. When the substitution of Ta was 0, 0.01 and 0.02, Morphotropic phase boundary (MPB) region, which is coexist with rhombodedral phase and tetragonal phase was appeared. With further increasing the Ta substitution, the ceramics showed the strengthened tetragonal phase together with the coexistence of rhombodedral phase and tetragonal phase. The NKN-BNZ ceramics with x = 0.02 showed excellent piezoelectric properties. The density (ρ), piezoelectric constant (d 33 ), planar piezoelectric coupling coefficient (k p ), mechanical quality factor (Q m ), and dielectric constant (ε r ) were optimized as 4.456 (g/cm 3 ), 269 (pC/N), 0.419, 51, 1644, respectively.