Enhanced piezoelectric performance of donor La3+-doped BiFeO3–BaTiO3 lead-free piezoceramics. Issue 6 (15th April 2020)

• Record Type: Journal Article
• Authors: Habib, Muhammad; Lee, Myang Hwan; Kim, Da Jeong; Choi, Hai In; Kim, Myong-Ho; Kim, Won-Jeong; Song, Tae Kwon; Choi, Kyu Sang
• Is Part Of: Ceramics international. Volume 46:Issue 6(2020)
• Page Start: 7074
• Page End: 7080
• Publication Date: 2020-04-15
• Subjects: Lead-free -- Piezoelectric -- La-doping -- BiFeO3–BaTiO3 -- Water quenching; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.11.199
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Lead-free 0.70Bi1.03 FeO3 -0.30Ba(1- x ) La x TiO3 piezoelectric ceramics (with x = 0.000, 0.005, 0.010, 0.015 and 0.035 abbreviated as 0.0BaLa, 0.5BaLa, 1.0BaLa, 1.5BaLa and 3.5BaLa) were prepared through the conventional solid-state reaction route followed by water quenching process. The X-ray diffraction profile shows that the substitution of Ba 2+ = 1.61 Å with a donor ion, La 3+ = 1.36 Å, has a profound impact on the crystal symmetry as results the crystal structure transform from dominant rhombohedral ( R ) to tetragonal ( T ) phase. A large remnant polarization ( P r = 30.3 μC/cm 2 ) and an enhanced direct piezoelectric coefficient, ( d 33 = 297 pC/N) together with a high Curie temperature ( T C = 530 °C) was obtained near to the morphotropic phase boundary (MPB) of the R and T phases. A maximum strain of ( S max = 0.188%) with corresponding converse piezoelectric coefficient ( d 33 * = 340 pm/V) and low strain hysteresis (≈20%) was found for 1.5BaLa ceramic. Additionally, the water quenching effect was more prominent for 1.0BaLa ceramic as observed from the high thermal hysteresis in heating/cooling results of the dielectric constant ( ε r ), leading to the enhancement of ferroelectric switching behavior. Hence, a small amount of La 3+ -substitution for Ba 2+ -site is more effective for the enhancement of ferroelectric and piezoelectric properties, similarly to the donor La 3+ -doped Pb(Zr, Ti)O3 ceramic.