Abstract
The effects of zirconium on (Ba, Sr)TiO3 solid solution are studied by preparing (Ba0.75Sr0.25) (Zry Ti1-y)O3 (BSZT) ceramics with γ ranging from 0 to 0.15. With increased incorporation of zirconium the lattice parameters increase with decreasingc/a ratio, while a linear relationship is found between (a 2 c)1/3 values and the content of zirconium. The Curie temperature (T c) is also lowered linearly with increasing γ. The Curie temperature of the (Ba1-xSrx (ZryTi1-y)O3 system can be estimated byT c = 125 − 270x − 350y (°C). Observations of microstructures also show that a small amount of zirconium promotes the grain growth, while a higher content will then inhibit it. Dielectric properties of BSZT dielectrics and BSZT-based boundary layer (BL) capacitors are also correlated to have similar temperature dependence, where the maximum dielectric constant at room temperature is found aty = 0.1.
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Ho, IC., Fu, SL. Effects of zirconium on the structural and dielectric properties of (Ba, Sr)TiO3 solid solution. J Mater Sci 25, 4699–4703 (1990). https://doi.org/10.1007/BF01129927
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DOI: https://doi.org/10.1007/BF01129927