Effects of Nd3+ Donor Doping on Dielectric, Electrical Conductivity and Ferroelectric Properties of (Bi0.5Na0.5)0.93Ba0.07TiO3 Lead-Free Ceramics

In order to clarify the Na/K ratios dependence of piezoelectric properties, ( K 1-x Na x) NbO 3 ceramics were prepared by conventional solid-state sintering at x = 0.4–0.6 with a smaller compositional interval (0.02 mol). The results demonstrate that the Na/K ratios have obvious effect on piezoelectric and ferroelectric properties of ( K 1-x Na x) NbO 3 ceramics. Piezoelectric and ferroelectric properties show the maximum (d33 = 147 pC/N, kp = 0.40, and Pr = 24 μC/cm2) at x = 0.54, which is not consistent with conventional viewpoint. The reasons should be attributed to the existence of a phase boundary at x = 0.54 mol, which is similar to the morphotropic phase boundary in Pb(Zr,Ti)O3 ceramics.

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Phase structure, microstructure and ferroelectric properties of (1−x)[(K0.50Na0.50)0.94Li0.06](Nb0.94Sb0.06)O3–xCaTiO3 lead-free ceramics

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2008.09.153 ◽

2009 ◽

Vol 476 (1-2) ◽

pp. 782-786 ◽

Cited By ~ 24

Author(s):

Jiagang Wu ◽

Dingquan Xiao ◽

Yuanyu Wang ◽

Jianguo Zhu ◽

Wei Shi ◽

...

Keyword(s):

Phase Structure ◽

Ferroelectric Properties ◽

Lead Free ◽

Lead Free Ceramics

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Piezoelectric and Strain Properties of Strontium-Doped BZT-BCT Lead-Free Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.1385 ◽

2012 ◽

Vol 512-515 ◽

pp. 1385-1389 ◽

Cited By ~ 6

Author(s):

Wang Feng Bai ◽

Wei Li ◽

Bo Shen ◽

Ji Wei Zhai

Keyword(s):

Coupling Coefficient ◽

Electromechanical Coupling ◽

Piezoelectric Coefficient ◽

Perovskite Phase ◽

Ferroelectric Properties ◽

Lead Free ◽

Electromechanical Coupling Coefficient ◽

Lead Free Ceramics ◽

Pure Perovskite Phase ◽

Free Material

Lead-free piezoelectric ceramics, (Ba0.85-xSrxCa0.15)(Zr0.1Ti0.9)O3 (BSCZT, x=0.01-0.07), were prepared via a solid-state reaction route. The dielectric properties, ferroelectric properties, piezoelectric and strain properties of BSCZT ceramics were studied. The phase structure and microstructure were investigated by X-ray diffraction and scanning electron microscope, respectively. Results showed that dense ceramics with pure perovskite phase were obtained. At room temperature, the samples with x=0.03 exhibited excellent properties with large piezoelectric coefficient d33=534pC/N, planar mode electromechanical coupling coefficient kp=47.7%, thickness mode electromechanical coupling coefficient kt= 42% and high strain levels of 0.34%. In addition, the study of electrical properties suggested that the Curie temperature decreased linearly from 92oc to 73oc with the increasing doping content of strontium in BCZT ceramics. The remnant polarizations, piezoelectric coefficient and strain levels were all increased as the Sr content increased and then decreased with further increased Sr doping level, giving the maximum values at the Sr content of 3mol%. These results indicated that the BSCZT system is a promising lead-free material for applications in the future.

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