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Effects of La-Substitution on the Ferroelectric and Piezoelectric Properties of Lead-Free BiFeO 3-BaTiO 3 Piezoelectric Ceramics

35 Pages Posted: 18 Jul 2019 First Look: Under Review

See all articles by Muhammad Habib

Muhammad Habib

Changwon National University - School of Materials Science and Engineering

Myang Hwan Lee

Changwon National University - School of Materials Science and Engineering

Da Jeong Kim

Changwon National University - School of Materials Science and Engineering

Hai In Choi

Changwon National University - School of Materials Science and Engineering

Myong-Ho Kim

Changwon National University - School of Materials Science and Engineering

Won-Jeong Kim

Changwon National University - Department of Physics

Tae Kwon Song

Changwon National University - School of Materials Science and Engineering

Kyu Sang Choi

Sunchon National University - Department of Physics Education

Abstract

La-substitution effects for Bi-site in 0.7Bi1.03(1-x)LaxFeO3-0.3BaTiO3 (abbreviated as BF30BT-xLF with x = 0.00 - 0.10) ceramics were investigated systematically. All these ceramics were synthesized by a conventional solid-state reaction method. From crystal structure investigation, it was found that BF30BT-0LF ceramic has a predominant rhombohedral symmetry whereas, for BF30BT-1LF composition rhombohedral-tetragonal (R-T) phases coexisted with each other as evident from the {111} and {200} peaks fitting deconvolution. However, for BF30BT-7LF ceramic, the crystal structure transforms to tetragonal and cubic-like (T-CL) mixed phase whereas above the 7 mol% cubic phase fraction become dominant. The largest direct piezoelectric coefficient (d33 = 274 pC/N) was obtained with a high Curie temperature (TC = 532 °C) for BF30BT-1LF ceramic, where the morphotropic phase boundary (MPB) was formed. Here we report that both electrical poling and cycling significantly improved the ferroelectric polarization in the hard-ferroelectric ceramics (i.e., x ≤ 0.035) and this effect gradually become weak in the soft ferroelectric (x ≥ 0.07) ceramics. Meanwhile, a high electric field induced strain (Smax = 0.27 %) with a converse piezoelectric coefficient (d33* = 500 pm/V) was obtained for BF30BT-7LF composition, which is comparable to those of Pb(Zr,Ti)O3 ceramics.

Keywords: lead-free piezoceramics, La-substitution, ferroelectric, electric field induced strain

Suggested Citation

Habib, Muhammad and Lee, Myang Hwan and Kim, Da Jeong and Choi, Hai In and Kim, Myong-Ho and Kim, Won-Jeong and Song, Tae Kwon and Choi, Kyu Sang, Effects of La-Substitution on the Ferroelectric and Piezoelectric Properties of Lead-Free BiFeO 3-BaTiO 3 Piezoelectric Ceramics (July 17, 2019). Available at SSRN: https://ssrn.com/abstract=3421327

Muhammad Habib

Changwon National University - School of Materials Science and Engineering

Changwon
Korea, Republic of (South Korea)

Myang Hwan Lee

Changwon National University - School of Materials Science and Engineering

Changwon
Korea, Republic of (South Korea)

Da Jeong Kim

Changwon National University - School of Materials Science and Engineering

Changwon
Korea, Republic of (South Korea)

Hai In Choi

Changwon National University - School of Materials Science and Engineering

Changwon
Korea, Republic of (South Korea)

Myong-Ho Kim

Changwon National University - School of Materials Science and Engineering

Changwon
Korea, Republic of (South Korea)

Won-Jeong Kim

Changwon National University - Department of Physics

Korea, Republic of (South Korea)

Tae Kwon Song (Contact Author)

Changwon National University - School of Materials Science and Engineering ( email )

Changwon
Korea, Republic of (South Korea)

Kyu Sang Choi

Sunchon National University - Department of Physics Education

Korea, Republic of (South Korea)

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