Patent ID: 8298448

Claim:
A low-temperature fired ceramic circuit board formed by subjecting a conductor paste and a green sheet to simultaneous firing at 800 to 900° C., wherein: the green sheet comprises (1) a glass powder which contains 35 to 39% by weight of SiO 2 , 9 to 17% by weight of Al 2 O 3 , 21 to 40% by weight of B 2 O 3 , 10 to 20% by weight of R′O where R′ represents at least one kind selected from the group consisting of Mg, Ca, and Ba, 0.2 to 2% by weight of Li 2 O, and 0.5 to 2% by weight of MO 2 where M represents at least one kind selected from the group consisting of Ti and Zr, and (2) an alumina powder at a weight ratio of the glass powder to the alumina powder of 4:6 to 6:4; and the conductor paste comprises Ag-containing metal particles, a binder component, and a heat decomposable alkali metal compound, and a content of the heat decomposable alkali metal compound is such that 0.13 to 7.8 alkali metal atoms are contained for each 100 metal atoms in the metal particles.