Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74341
Title: Coexistence of three ferroelectric phases and enhanced piezoelectric properties in BaTiO3-caHfO3 lead-free ceramics
Authors: Yang, Y
Zhou, Y
Ren, J
Zheng, Q
Lam, KH 
Lin, D
Keywords: Barium titanate
Coexistence of three ferroelectric phases
Phase transition
Piezoelectric properties
Issue Date: 2018
Publisher: Elsevier
Source: Journal of the European Ceramic Society, 2018, v. 38, no. 2, p. 557-566 How to cite?
Journal: Journal of the European Ceramic Society 
Abstract: Perovskite ferroelectrics possess the fascinating piezoelectric properties near a morphotropic phase boundary, attributing to a low energy barrier that the results in structural instability and easy polarization rotation. In this work, a new lead-free system of (1-x)BaTiO3-xCaHfO3 was designed, and characterized by a coexistence of ferroelectric rhombohedral-orthorhombic-tetragonal (R-O-T) phases. With the increase amount of CaHfO3 (x), a stable coexistence region of three ferroelectric phases (R-O-T) exists at 0.06 ≤ x ≤ 0.08. Both large piezoelectric coefficient (d33∼400 pC/N), inverse piezoelectric coefficient (d33*∼547 pm/V) and planar electromechanical coupling factor (kp∼58.2%) can be achieved for the composition with x = 0.08 near the coexistence of three ferroelectric phases. Our results show that the materials with the composition located at a region where the three ferroelectric R-O-T phases coexist would have the lowest energy barrier and thus greatly promote the polarization rotation, resulting in a strong piezoelectric response.
URI: http://hdl.handle.net/10397/74341
ISSN: 0955-2219
EISSN: 0955-2219
DOI: 10.1016/j.jeurceramsoc.2017.09.023
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