| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dielectric ceramic for microwave, capable of being laminated with a cheap metal having a large conductivity such as Ag and Cu, and capable of being simultaneously fired. SOLUTION: When the composition formula of a dielectric ceramic for a microwave, comprising BaO, CaO, WO3, TiO2, CuO, and a borosilicate glass is represented by the formula [ v((BaO)u(CaO)1-u-w(WO3)}-x(TiO2)]-y(CuO)-z(borosilicate glass), the molar fraction ratio c/w of ((BaO)u-(CaO)1-u) to WO3 is regulated within the range of 0.9<=v/w<=1.2, and the molar fraction ratio x/(v+w) of the TiO2 to v((BaO)u-(MgO)1-u)-w(WO3)} is regulated within the range of 0<=x/(v+w)<=1.5. CuO within the range of 0.5 wt.% <=y<=10 wt.% and the borosilicate glass within the range of 1 wt.% <=z<=30 wt.% added to 1 mol main ingredient [ v((BaO)u-(CaO)1-u)-w(WO3)}-w(TiO2)]. |
