Effect of sintering temperatures on temperature coefficient of capacitance of KCa₂Nb₃O₁₀ bulk-layered perovskite

Multilayer ceramic capacitors (MLCCs) for electric vehicles require their room temperature capacitance to change ≤ ±15% at −55°C 200°C. The dielectric constant (ε) of BaTiO3, a material widely used in MLCCs, drops >125°C making its application difficult. Here, we propose KCa2Nb3O10 (KCNO)-layered perovskite as strong candidate vehicle MLCCs ε does not abruptly with temperature. effect sintering on the coefficient (TCC) KCNO is studied. powder calcined 900–1200°C sintered 1200°C–1300°C. Microstructure and temperature-dependent are determined by temperature, while density related difference between calcining temperatures. Only samples 1300°C (except one 900°C) varies 25°C–200°C (ε ~250 temperature). sample 1100°C has highly elongated grains highest activation energy. These factors responsible TCC being 25–200°C.