Temperature stable (1-x)(0.9Na0.5Bi0.5TiO3-0.1BiAlO3)-xNaTaO3 ceramics and capacitors with ultra-wide operational range

Temperature stable multilayer ceramic capacitors (MLCCs) are urgently required for electronic equipment applications. In this work, NaTaO3 modified (1-x)(0.9Na(0.5)Bi(0.5)TiO(3)-0.1BiAlO(3)) ceramics (NBT-10BA-100xNT) were designed and fabricated. The effects of NaTaO3 concentration on the dielectric properties, insulating properties, and energy storage properties were investigated. At the optimum composition of x = 0.25, stable permittivity (Delta epsilon'/epsilon'(25)degrees(C) <= +/- 15%) and low dielectric loss (tan delta <= 0.02) over a wide temperature range of -100-334 degrees C were achieved. Furthermore, NBT-I0BA-25NT based MLCC5 with 70Ag/30 Pd inner electrodes were successfully fabricated by tape-casting method, which also exhibited both stable permittivity (Delta epsilon'/epsilon'(25)degrees(C) <= +/- 15%) and low dielectric loss (tan delta <= 0.02) in an ultra-wide temperature range (-100-398 degrees C). These excellent performances suggest that NBT-10BA-25NT could be a promising candidate of dielectrics with ultra-wide operational temperature range for MLCCs. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study developed NaTaO3 modified ceramics for stable and low dielectric loss properties, successfully applied in MLCCs. The material demonstrated stable characteristics even in extreme temperature ranges.