Effects of Bi0.5
Na0.5
HfO3
 addition on the phase structure and piezoelectric properties of (K, Na)NbO3
-based ceramics

Lead-free (1-x-y)Na1/2Bi1/2TiO3-xBaTiO3-yBiFeO3 ceramics were synthesized by ordinary sintering technique. The compositional dependence of phase structure and electrical properties of the ceramics was systematically investigated. All samples possessed pure perovskite structure. The dielectric and piezoelectric properties of ceramics were investigated with the amount of different BiFeO3 substitutions. The addition of BiFeO3 can not only decrease Ec and Pr but also lead to a significant degradation of the dielectric loss tanδ.

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Structure and Piezoelectric Properties of PZN-PNN-PT Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.280-283.223 ◽

2007 ◽

Vol 280-283 ◽

pp. 223-226 ◽

Cited By ~ 4

Author(s):

Jin Song Pan ◽

Xiao Wen Zhang ◽

Ke Pi Chen ◽

Chao Lei

Keyword(s):

Phase Structure ◽

Piezoelectric Properties ◽

Perovskite Phase ◽

Ferroelectric Ceramics ◽

Phase Boundaries ◽

Precursor Method ◽

Pure Perovskite Phase ◽

The Relationship ◽

Columbite Precursor ◽

Better Than

(1-x)(0.64PNN-0.36PT)-x(0.91PZN-0.09PT) ferroelectric ceramics with different x were synthesized by the columbite precursor method. The phase structure and piezoelectric properties were investigated. XRD profiles implied that with the increasing of x, samples could no longer maintain the pure perovskite phase. All the compositions were found to lie within the region of the morphotropic phase boundaries (MPBs) with different contents of rhombohedral and tetragonal phases. The piezoelectric coefficients for compositions with x £ 0.30 were obviously better than those for the rest ones and the composition with x = 0.15 exhibited the largest value of d33 among all the samples. The relationship between the structure and the piezoelectric properties was discussed.

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Phase structure and piezoelectric properties of Li-modified NKLN lead-free piezoelectric ceramics

Journal of the Korean Physical Society ◽

10.3938/jkps.61.891 ◽

2012 ◽

Vol 61 (6) ◽

pp. 891-894

Author(s):

Sin-Woong Kim ◽

Sung-Chan Lee ◽

Min-Soo Kim ◽

Soon-Jong Jeong ◽

In-Sung Kim ◽

...

Keyword(s):

Phase Structure ◽

Piezoelectric Properties ◽

Piezoelectric Ceramics ◽

Lead Free

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Microstructure and Piezoelectric Properties of (0.996-x) K0.5Na0.5NbO3 - 0.004 BiFeO3 - x LiSbO3 Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.531-532.632 ◽

2012 ◽

Vol 531-532 ◽

pp. 632-635

Author(s):

Min Hong Jiang ◽

Xin Yu Liu ◽

Guo Hua Chen ◽

Jia Feng Ma ◽

Gui Sheng Zhu ◽

...

Keyword(s):

Electrical Properties ◽

Phase Boundary ◽

Pore Size ◽

Mixed Oxide ◽

Phase Structure ◽

Composition Range ◽

Piezoelectric Properties ◽

Lead Free ◽

Compositional Dependence ◽

Tan Δ

(0.996-x) K0.5Na0.5NbO3- 0.004 BiFeO3- x LiSbO3 (x =0.00, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07) lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The compositional dependence of the phase structure and the electrical properties of the ceramics were studied. A morphotropic phase boundary between the orthorhombic and tetragonal phases was identified in the composition range of 0.03 < x < 0.06. With the content of LS increases, the size of the pores significantly decreases. However, adding larger amount of LS makes the pore size increase slightly. The (0.996-x)KNN-0.004 BF-xLS(x=0.05) ceramics possess good electrical properties: d33 = 280 pC/N, kp = 53.3%, Tc = 345 °C, εr = 1613, Tan δ =2.07%. These results show that the ceramic is a promising lead-free piezoelectric material.

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