(Ca,Sr,Ba)TiO_3-Based Dielectrics Sintered in Reducing Atmosphere

摘要

The anti-reducing sintering of (Ca,Sr,Ba)TiCvbased dielectrics was achieved by the cooperating effect ofMn~(2+), Ca~(2+), Mg~(2+), Dy~(3+) and Yb~(3+). A small quantity of Zr~(4+) partly substitution for Ti~(4+) can improve the temperature dependence of dielectric constant. But ZrO_2 will also reduce the solid solubility of BaTiO_3-SrTiO_3-CaTiO_3 ternary system, and may cause phase separation. The separated ferroelectric phase increases the capacitance change under DC bias. Non-reducible (Ca,Sr,Ba)(Ti,Zr)O_3-based dielectrics with single orthorhombic phase of perovskite structure was obtained. The dielectric and DC bias properties are: △C/C (DC bias: 1.5kV/mm) <0.05%, ε =250～300, tgδ < 0.5%.