SrTiO₃-modified CaCu₃Ti₄O₁₂ ceramics with low dielectric loss and excellent temperature stability for X8P capacitors

CaCu3Ti4O12 (CCTO) dielectrics can be extremely important potential candidate materials for electrical devices. However, their practical application process is somewhat restricted by some longstanding problems, such as insufficient temperature stability and large dielectric loss. Therefore, x wt% SrTiO3 added CCTO ceramics (x = 0, 2, 3 and 4) were prepared via sol-gel route. When x = 3, the ceramic sample exhibits a dielectric constant (epsilon ') of 2968, a high breakdown field strength of 11.61 kV/cm and a low dielectric loss of 0.009 at room temperature. Excitingly, the epsilon ' of this modified x = 3 sample shows less than +/- 10% variation in the temperature range of - 125 to 150 degrees C, which meets the commercial standard for X8P capacitors (Delta epsilon ' <= +/- 10% at - 55 to 150 degrees C). The presence of these excellent properties in this sample is inextricably linked to its high grain boundary resistance and the larger grain boundary activation energy. Therefore, this study shows that the improved samples can promote the application process of CCTO and be adopted in the future for the preparation of excellent ceramic samples.