Patent ID: 6380118
Filing Date: 2002-04-30
Classification: C04B,H01G,H05B

Abstract:
A nonlinear dielectric ceramic having D-E hysteresis characteristics and reduction resistance comprising:a barium titanate compound represented by the formula (Ba1âˆ’xâˆ’yâˆ’zSrxCayMgzO)mÂ·(Ti1âˆ’oâˆ’pZroHfp)O2, wherein subscripts x, y, z, m, o, and p satisfy the relationships 0&lE;x&lE;0.05, 0&lE;y&lE;0.02, 0&lE;z&lE;0.005, 0.995&lE;m&lE;1.02, 0&lE;o&lE;0.12, 0&lE;p&lE;0.12 and 0.035&lE;o+p&lE;0.12 as a principal constituent; anda nonreducing oxide glass as a secondary constituent; wherein the nonreducing oxide glass comprises at least one first nonreducing oxide glass or second nonreducing oxide glass, the first nonreducing oxide glass being represented by the formulaxLi2O-y(SiwTi1âˆ’w)O2-zMO where MO is at least one of Al2O3 and ZrO2, and where x, y and z refer to mole %, and subscript w satisfies the relationship 0.30&lE;w&lE;1.0, and in a ternary composition diagram, the points (x, y, z) lie within a polygon, including the sides of the polygon, obtained by linking points A (20, 80, 0), point B (10, 80, 10), point C (10, 70, 20), point D (35, 45, 20), point E (45, 45, 10) and point F (45, 55, 0), provided that w<1.0 when the point lies on the line A-F, and the second nonreducing oxide glass being represented by the formulaSiO2â€”TiO2â€”XO where XO is at least one oxide selected from the group consisting of BaO, CaO, SrO, MgO, ZnO and MnO.