TY - JOUR
T1 - Phase transition, ferroelectric and piezoelectric properties of B-site complex cations (Fe0.5Nb0.5)4+-modified Ba0.70Ca0.30TiO3 ceramics
AU - Li, Cai Xia
AU - Hong, Yue Nan
AU - Yang, Bin
AU - Zhang, Shan Tao
AU - Liu, Dan Qing
AU - Wang, Xi Ming
AU - Liu, Qian
AU - Zhao, Lei
AU - Cao, Wen Wu
N1 - Funding Information:
This work is supported by the Natural Science Foundation of Heilongjiang Province of China (NO. E2016041).
Funding Information:
This work is supported by the Natural Science Foundation of Heilongjiang Province of China (NO. E2016041 ).
Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/5
Y1 - 2020/5
N2 - Ba0.70Ca0.30Ti1-x (Nb0.5Fe0.5)xO3 lead-free ceramics (abbreviated as BCTNFx, x = 0–0.12) were prepared by solid-state reaction method. The influence of B-site (Fe0.5Nb0.5)4+ substitution on phase structure, microstructure, dielectric, ferroelectric and piezoelectric properties of Ba0.70Ca0.30TiO3 ceramics were systematically studied. The BCTNFx ceramics consist of diphasic tetragonal (T) and orthorhombic (O) phases at x = 0–0.04, pseudocubic (PC) and O phases at x = 0.05–0.08, cubic (C) and O phases at 0.08 < x ≤ 0.12. Increase of (Fe0.5Nb0.5)4+ doping improves sinterability, depresses the ferroelectric - paraelectric phase transition temperature (Tm) monotonically from 128 °C at x = 0 to -86 °C at x = 0.12, induces enhanced relaxor behavior and weakens piezoelectric properties. The room temperature relative dielectric constant (εr) and dielectric loss tangent (tanδ) increase with increasing x and reach the maximum values of 4869 and 0.06 respectively at x = 0.06. Whereas the average grain size (abbreviated as AGS), ferroelectric properties and electric field induced strain increase significantly by introducing 2.0 mol% B-site complex cations (Fe0.5Nb0.5)4+ into Ba0.70Ca0.30TiO3 ceramics. The BCTNF0.02 ceramics achieve optimal electrical properties with εr = 1268, tan δ = 0.03, Tm = 102 °C, Pmax = 12.8 μC/cm2, Pr = 6.1 μC/cm2, EC = 6.0 kV/cm, d33 = 117 pC/N, kp% = 0.18%, Qm = 236, bipolar Smax% = 0.20%, unipolar Smax% = 0.16% and d33 ∗ = 314 pm/V. The variation of electrical properties of BCTNFx ceramics is attributed to the combined action of grain size effect, phase transition, weakness of octahedral distortion, clamping effects of the internal bias electric field Ei on domain wall motion induced by B-site cations (Fe0.5Nb0.5)4+ displacement.
AB - Ba0.70Ca0.30Ti1-x (Nb0.5Fe0.5)xO3 lead-free ceramics (abbreviated as BCTNFx, x = 0–0.12) were prepared by solid-state reaction method. The influence of B-site (Fe0.5Nb0.5)4+ substitution on phase structure, microstructure, dielectric, ferroelectric and piezoelectric properties of Ba0.70Ca0.30TiO3 ceramics were systematically studied. The BCTNFx ceramics consist of diphasic tetragonal (T) and orthorhombic (O) phases at x = 0–0.04, pseudocubic (PC) and O phases at x = 0.05–0.08, cubic (C) and O phases at 0.08 < x ≤ 0.12. Increase of (Fe0.5Nb0.5)4+ doping improves sinterability, depresses the ferroelectric - paraelectric phase transition temperature (Tm) monotonically from 128 °C at x = 0 to -86 °C at x = 0.12, induces enhanced relaxor behavior and weakens piezoelectric properties. The room temperature relative dielectric constant (εr) and dielectric loss tangent (tanδ) increase with increasing x and reach the maximum values of 4869 and 0.06 respectively at x = 0.06. Whereas the average grain size (abbreviated as AGS), ferroelectric properties and electric field induced strain increase significantly by introducing 2.0 mol% B-site complex cations (Fe0.5Nb0.5)4+ into Ba0.70Ca0.30TiO3 ceramics. The BCTNF0.02 ceramics achieve optimal electrical properties with εr = 1268, tan δ = 0.03, Tm = 102 °C, Pmax = 12.8 μC/cm2, Pr = 6.1 μC/cm2, EC = 6.0 kV/cm, d33 = 117 pC/N, kp% = 0.18%, Qm = 236, bipolar Smax% = 0.20%, unipolar Smax% = 0.16% and d33 ∗ = 314 pm/V. The variation of electrical properties of BCTNFx ceramics is attributed to the combined action of grain size effect, phase transition, weakness of octahedral distortion, clamping effects of the internal bias electric field Ei on domain wall motion induced by B-site cations (Fe0.5Nb0.5)4+ displacement.
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U2 - 10.1016/j.ceramint.2019.12.214
DO - 10.1016/j.ceramint.2019.12.214
M3 - Article
AN - SCOPUS:85077145853
SN - 0272-8842
VL - 46
SP - 9519
EP - 9529
JO - Ceramics International
JF - Ceramics International
IS - 7
ER -