Electromechanical properties of ternary BiFeO3−0.35BaTiO3–BiGaO3 piezoelectric ceramics

• Published in: Journal of electroceramics Vol. 41; no. 1-4; pp. 93 - 98
• Main Authors: Akram, Fazli, Malik, Rizwan Ahmed, Khan, Salman Ali, Hussain, Ali, Lee, Soonil, Lee, Myang-Hwan, In, Choi Hai, Song, Tae-Kwon, Kim, Won-Jeong, Sung, Yeon Soo, Kim, Myong-Ho
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2018
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Crystallography and Scattering Methods; Electrochemistry; Glass; Materials Science; Natural Materials; Optical and Electronic Materials; Ferroelectric; BiFeO; BaTiO; Dielectric; Piezoelectric; Lead-free
• ISSN: 1385-3449; 1573-8663
• DOI: 10.1007/s10832-018-0169-3

In the present work, composition dependent crystal structure, ferroelectric, piezoelectric, and temperature dependent dielectric properties of the BiGaO 3 -modified (1– x )(0.65Bi 1.05 FeO 3 –0.35BaTiO 3 ) (BFBT35– x BG, where x  = 0.00–0.03) lead-free ceramics were systematically investigated by solid-state reaction method, followed by water quenching process. The substitution of BG successfully diffuses into the lattice of the BFBT ceramics, without changing the pseudo-cubic structure of the samples. The scanning electron microscopy (SEM) results revealed that the average grain size was increased with BG-content in BFBT system. The BFBT– x BG ceramics showed a maximum in permittivity (ɛ max ) at temperatures ( T max ) above 500 °C in the compositional range of 0.00 ≤  x  ≤ 0.03. The electro-strain is measured to be 0.125% ( d * 33 ~ 250 pm/V) under unipolar fields (5 kV/mm) for BFBT–0.01BG ceramics. The same composition ( x  = 0.01), large static piezoelectric constant ( d 33 ~ 165 pC/N) and electromechanical coupling factor ( k p ~ 25%) were obtained. The above investigated characterizations suggests that BFBT–BG material is favorable for piezoelectric and high temperature applications.