Effects of Co2O3 on the Piezoelectric Properties of Na0.5Bi0.5TiO3 Lead-Free Piezoelectric Ceramics

Xiang Ping Jiang; Zi Yi Feng; Mei Lin; Chao Chen; Kai Zheng Shu

doi:10.4028/www.scientific.net/KEM.434-435.340

Paper Titles

Low Sintering of the Temperature-Stable Dielectric Ceramics Based on Barium Titanate in Reducing Atmosphere
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Synthesis of BaTiO₃ Nanorods at Room Temperature and Normal Pressure
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Preparation and Characteristics of BiFeO₃ Ceramics Doped by MnO₂ and Co₂O₃
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Effect of Gel-Calcination on Piezoelectric Property in (1-x)BiScO₃-xPbTiO₃ Ferroelectrics
p.335

Effects of Co₂O₃ on the Piezoelectric Properties of Na_0.5Bi_0.5TiO₃ Lead-Free Piezoelectric Ceramics
p.340

The Left-Handed Properties of the Composite Medium Composed of Ferrite Cubes’ Array and Copper Net
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Effect of Specific Surface Area on Growth and Porosity of Oxide Superconducting Ceramic YBCO Single Domain
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Comparative Study on Ni-Zn Ferrites by One-Step Synthesis and Conventional Two-Step Synthesis
p.350

Synthesis of Magnetic Nano-Composite by Partial Reduction of Barium Hexaferrite via High-Energy Ball Milling
p.354

HomeKey Engineering MaterialsKey Engineering Materials Vols. 434-435Effects of Co2O3 on the Piezoelectric Properties...

Effects of Co₂O₃ on the Piezoelectric Properties of Na_0.5Bi_0.5TiO₃ Lead-Free Piezoelectric Ceramics

Abstract:

Lead-free piezoelectric ceramics Na0.5Bi0.5TiO3+xmol%Co3+ (NBT-xC) were synthesized by conventional solid-state process. Effects of Co3+ addition on the phase structure, dielectric and piezo- electric properties of NBT-xC were investigated. The X-ray diffraction suggested that all specimens were rhombohedral perovskite structure. After a small addition of Co2O3, a dense microstructure with increased grains was developed. The doping with Co3+ enhanced mechanical quality factor Qm significantly, whereas piezoelectric constant d33 and electromechanical coupling factor kp decreased slightly with increasing amount of Co3+. For the ceramics with x=3, the electric properties become optimum, which are as follows: d33=~70pC/N, kp=~13%, Qm=~934, tanδ=~0.02 (1kHz), respectively. These results indicate that the Co3+ ion was considered to replace Ti4+ ion and present “hard doping” effect.