Preparation and characterization of Pb(Lu1/2Nb1/2)O3-Pb(Ni1/3Nb2/3)O3-PbTiO3 ternary ferroelectric ceramics with high piezoelectric constant

• Published in: Materials research bulletin 2018-06, Vol.102, p.122-129
• Main Authors: Qiao, Xianji, Li, Xiuzhi, Wang, Zujian, He, Chao, Liu, Ying, Yang, Xiaoming, Long, Xifa
• Format: Article
• Language: English
• Subjects: CERAMICS; CURIE POINT; CURIE-WEISS LAW; Dielectric properties; FERROELECTRIC MATERIALS; Ferroelectricity; LEAD COMPOUNDS; MATERIALS SCIENCE; PEROVSKITE; PHASE TRANSFORMATIONS; PIEZOELECTRICITY; POLARIZATION; PRECURSOR; TITANATES; X-RAY DIFFRACTION
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2018.01.038

Pb(Lu1/2Nb1/2)O3-Pb(Ni1/3Nb2/3)O3-PbTiO3 ferroelectric ceramics were successfully prepared and the structural, dielectric, ferroelectric and piezoelectric properties were characterized. The composition within MPB exhibit optimal properties with piezoelectric coefficient d33 = 378 pC/N, Curie temperature Tc = 142 °C, dielectric constant ε΄ = 4700, dielectric loss tangent tanδ = 0.05, remanent polarization Pr = 27.1 μC/cm2 and coercive field Ec = 8.89 KV/cm. [Display omitted] •PLN-PNN-PT ternary ferroelectric systems were prepared by two-step method.•PLN-PNN-PT ceramics exhibit typical relaxor behavior.•0.17PLN-0.47PNN-0.36PT ceramic has optimal properties (TC  ∼ 142 °C, d33 ∼ 378 pC/N). Pb(Lu1/2Nb1/2)O3-Pb(Ni1/3Nb2/3)O3-PbTiO3 ferroelectric ceramics were successfully prepared by a modified two-step columbite precursor method. The structural, dielectric, ferroelectric and piezoelectric properties were characterized by X-ray diffraction, ferroelectric and dielectric measurements. All the obtained samples have pure perovskite structure. The composition of 0.17PLN-0.47PNN-0.36PT within morphotropic phase boundary exhibits optimal properties with piezoelectric coefficient d33 = 378 pC/N, Curie temperature Tc = 142 °C, dielectric constant ε΄ = 4700, dielectric loss tangent tanδ = 0.05, remnant polarization Pr = 27.1 μC/cm2 and coercive field Ec = 8.89 KV/cm. According to Curie-Weiss Law and Lorentz-type quadratic relationship, the dielectric behavior was studied and the relaxor factor γ is between 1.55–1.87, indicating the character of diffuse phase transition of the Pb(Lu1/2Nb1/2)O3-Pb(Ni1/3Nb2/3)O3-PbTiO3 ceramics. The excellent piezoelectric properties and high Curie temperature make this system a promising material for high-power transducer applications in a broad temperature range.