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Effect of solid content variations on PZT slip for tape casting

Jian Gang (School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, China)
Qingxian Hu (School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, China)
Sheng Lu (School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, China)
Zhou Dongxiang (MOE Engineering Research Center for Information Functional Ceramics, Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan, China)
Qiuyun Fu (MOE Engineering Research Center for Information Functional Ceramics, Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan, China)

Lead zirconate titanate (PZT) particles with pure tetragonal structure were synthesized by solid-state reaction method and used for preparation of slurries with different solid contents (34-80 wt.%). Then, PZT thick films were fabricated by the nonaqueous tape casting method. It was shown that the slurry prepared from ball-milled particles exhibited better rheology properties than slurry from particles which were not ball-milled. Measurement of sedimentation volumes and zeta potentials indicated particle aggregation, resulting in weak stability of the slurries with high solid contents. The microstructure, piezoelectric and ferroelectric properties of PZT sintered films were investigated in terms of solid contents. Ceramic films prepared from the slurry with solid contents of 73 wt.% had the optimal structure and properties. After poling at 200 °C with an applied field of 1.2 kV/cm, a d33 of 294 pC/N was achieved; typical ferroelectric properties were also observed with a Ps of 38 μC/cm2.

Keywords: lead zirconate titanates, tape casting, piezoelectric properties, structural characterization