Piezoelectric and mechanical properties of CaO reinforced porous PZT ceramics with one-dimensional pore channels

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• 作者：Wei Liu^a ; ^{lwnuc@163.com} ; Wenting Liu^a ; Yanzhong Wang^a ; Chaorui Xue^a ; Jianhong Wang^a ; Jinlong Yang^a ; ^b ; ^{jlyang@mail.tsinghua.edu.cn}
• 关键词：3-1 Type ; Porous PZT ceramics ; Doping ; Piezoelectric properties ; Mechanical properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：2063-2068
• 全文大小：1691 K
• 卷排序：43

文摘

The formation of capillaries in sodium alginate gels is a dissipative process driven by unidirectional diffusion of divalent cations into sodium alginate sols. In the present work, we have prepared 3-1 type porous lead zirconate titanate (PZT) ceramics with oxides (CaO) being doped on a molecular level from the dissipative process by incorporating PZT particles into the sodium alginate gel matrix. By varying the concentration of cation solutions (CaCl2) from 0.5 mol/L to 2.5 mol/L, both the microstructure, doping amount of oxides (CaO) and crystalline phase of the porous PZT ceramics were tailored. Accordingly, increase in the concentration of Ca2+ has led to a reduction in the relative permittivity (εr) first, and then an increase, while the piezoelectric coefficient (d33 and d31) demonstrated an opposite variation tendency. The prepared samples possessed a maximal HFOM value of 4755×10–15 Pa−1 when the concentration of Ca2+ was 1.0 mol/L. Addition of CaO was found to improve the compressive strength of porous PZT ceramics, which was preferential to promoting the stability and reliability for application.