Patent ID: 7189673

Claim:
A dielectric material consisting of (i) at least one of Ca and Sr; (ii) Ti, a portion of which is optionally substituted by Sn; (iii) Al, a portion of which is optionally substituted by a member selected from the group consisting of Ga, Y and Yb; (iv) at least one of Nb and Ta; (v) O; and (vi) optionally Mn wherein the elements (i) to (v) fulfill the following requirements when represented by a compositional formula, aM 1 O-bM 3 O 2 -(½)cM 4 2 O 3 -(½) dM 2 2 O 5 wherein M 1 represents at least one of Ca and Sr; M 2 represents at least one of Nb and Ta; M 3 represents Ti or Ti and Sn when Sn is present; M 4 represents Al and when present one or more of Ga, Y and Yb and a, b, c and d represent each a molar ratio, provided that a+b+c+d=1: 0.436<a≦0.500; 0.124<b≦0 325; 0.054<c≦0 150; and 0.170<d<0.346.