Patent ID: 7396785

Claim:
A ceramic substrate composition comprising a glass represented by aB 2 O 3 -bRe 2 O 3 -cZnO in which Re is a rare earth element which is at least one element selected from the group consisting of lanthanum and neodymium and the molar amounts a+b+c=1; and wherein the molar amounts (a, b, and c) fall within a region defined in a ternary composition diagram by Point A (0.4, 0.595, 0.005), Point B (0.4, 0.25, 0.35), Point C (0.52, 0.01, 0.47), Point D (0.9, 0.005, 0.095), and Point E (0.9, 0.09, 0.01) or on the lines connection the Points, at least one oxide selected from the group consisting of aluminum oxide and titanium oxide in an amount of 50% or less by weight of the total amount, and a mixed oxide ceramic material including at least one crystal phase selected from the group consisting of ReBO 3 , Re 3 BO 6 , Re(B 2 O 3 ) 3 and ReB 3 O 6 .