Stable Temperature Dielectrics of (Ba,Ca)(Ti,Zr)O-3-Based MLCCs with Non-Core-Shell Structure by Novel Sintering Approach

作者：Wang Shih Hao^*; Lee Wen Hsi; Tsai Yin Lai; Lee Ying Chieh

来源：International Journal of Applied Ceramic Technology, 2015, 12: E25-E31.

DOI：10.1111/ijac.12192

In this study, the high stability temperature coefficient of capacitance (TCC) characteristics of (Ba,Ca)(Ti,Zr)O-3-based multilayer ceramic capacitors (MLCCs) were investigated using a novel sintering approach that combines rapid heating and constrained sintering. The novel sintering approach is based on a sandwich structure that the constrained (Ba,Ca)(Ti,Zr)O-3-based MLCCs are covered with BaTiO3 as a constraining layer on both sides. An in-plane tensile stress resulting from the mismatch between the constraining layer and the constrained layer during heating can effectively inhibit grain growth of (Ba,Ca)(Ti,Zr)O-3-based MLCCs and then modify the TCC characteristics of (Ba,Ca)(Ti,Zr)O-3-based MLCCs from Y5V (-82%oC/C+22% from -30 degrees C to 85 degrees C) to X5R (-15%oC/C+15% from -55 degrees C to 85 degrees C). The high continuity (>95%) of inner electrode and the fine grain size (0.56m) of BCTZ-based MLCCs with a non-core-shell structure can be attained by means of the rapid constrained sintering technique. The lifetime of the fine-grain-BCTZ-based MLCC fired by the novel sintering is superior to that of the coarse-grain-BCTZ-based MLCC fired by conventional sintering in a highly accelerated life test.

• 出版日期2015-2