Study on the Property of Ba0.85Ca0.15Ti0.9Zr0.1O3 Lead-Free Piezoelectric Ceramics Doped with Li2CO3

Zhi Wen Zhu; Xin You Huang; Hai Tang Hua; Yan Li

doi:10.4028/www.scientific.net/AMR.549.651

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 549Study on the Property of Ba0.85Ca0.15Ti0.9Zr0.1O3...

Study on the Property of Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃ Lead-Free Piezoelectric Ceramics Doped with Li₂CO₃

Abstract:

Ba_0.85Ca_0.15Ti_0.9Zr_0.1O₃-xLi₂CO₃ lead-free piezoelectric ceramics (abbreviated as BCZT-xLi) were prepared by conventional solid state reaction method. The microstructure, piezoelectric properties and dielectric properties were studied for BCZT-xLi samples doped with different Li₂CO₃ content(x= 0, 0.05, 0.1 0.2 0.3, 0.4wt. %). The results show that the piezoelectric constant(d₃₃), planar electron mechanical coupling coefficient(k_p) and thickness electron mechanical(k_t) of BCZ-T-xLi ceramics increase firstly and decreases subsequently with increasing of Li⁺ doping amount, the dielectric loss(tanδ) of BCZT-xLi ceramics decreases firstly and then increases at the same time while Li⁺ doping amount increases. But the r-elative permittivity (ε_r) of BCZT-xLi ceramics increases all the time. With the in-creasing of the amount of Li₂CO₃ doped the grain size of BCZT-Li ceramic first increases and then decreases. The BCZT-xLi ceramics display the optimum properties (d₃₃=83, tanδ=0.035, ε_r=2020, k_p=0.41, k_t=0.046) while Li₂CO₃ doped amount is 0.20wt. %.