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Mao L.,Key Laboratory of Sichuan Province for Chemical Synthesis and Pollution Control | Liao Y.,Key Laboratory of Sichuan Province for Chemical Synthesis and Pollution Control | Liao Y.,China West Normal University | Pu H.,Key Laboratory of Sichuan Province for Chemical Synthesis and Pollution Control | And 3 more authors.
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2011

A novel system of (Bi0.5Na0.5) TiO3 (BNT)-based A-site multi-component lead-free piezoelectric ceramics, [Bi0.5 (Na1-x-yKxAgy)0.5]1-z BazTiO3, was prepared by the conventional ceramic technique, and the effects of the contents of K+, Ag+ and Ba2+ on the microstructure and electrical properties of the ceramics were studied. The X-ray diffraction patterns showed that all the ceramics investigated could form a pure perovskite phase and the morphotropic phase boundary (MPB) of [Bi0.5 (Na1-x-yKxAgy)0.5]1-z BazTiO3 ceramics was in the composition range of 0.15≤x≤0.20 (y=0.015, z=0.06). The K+ and Ba2+could suppress the growth of the grains and Ag+ had unobvious influence on the ceramic grains. At the room temperature, when x=0.175, y=0.015 and z=0.06, the [Bi0.5 (Na0.81K0.175 Ag0.015)0.5]0.94 Ba0.06TiO3 ceramics exhibited the piezoelectric constant of d33=154 pC/N, the electromechanical coupling factor of kp=0.177, the mechanic quality factor of Qm of 87, the relative dielectric constant εr=1010, and the dielectric loss of tan δ=0.034.

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