Low temperature sintering and nonlinear dielectric properties of lithium-doped Ba0.6Sr0.4TiO3 thick films prepared by tape-casting
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The thick films with nominal composition of Ba0.6Sr0.4TiO3+0.4 wt% Li2O were prepared through tape casting. The structure and nonlinear dielectric properties of the resulting thick films were investigated within the sintering temperature range of 1050–1100 °C. The thick film specimens sintered at the relatively low temperatures exihibited dense and no crack microstructure due to the addition of sintering aid Li2O and modified process technology. An obvious influence of sintering temperature on the microstructure and nonlinear dielectric properties was detected. The discrepancy in nonlinear dielectric properties among the specimens sintered at different temperatures was qualitatively interpreted in terms of interfacial charge accumulation and defect dipole reorientation. Sintering at 1080 °C was determined to be preferred for the specimens with regard to the nonlinear dielectric properties. At room temperature, the specimen attained a dielectric constant of 3050 and a relatively low dielectric loss tangent of 0.15% at 10 kHz together with a extremely large figure of merits (FOM) of 580 and a tunability of 88% at 10 kHz and 200 kV/cm.
This work was supported by the National Natural Science Foundation of China (No. 51372077), the China Scholarship Council (CSC) (Nos. 201708420295 and 201808420381) and Hubei Polytechnic University (No. 12xjz02R).