Abstract A dielectric ceramic composition consists essentially of a main component of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 --Pb(Cu 1/2 W 1/2 )O 3 --PbTiO 3 , and contains a glass composition with a melting point of 600° to 900° C. in an amount of 0.5 to 1.5 parts by weight per 100 parts by weight of the main component. The main component has a composition represented by the general formula: xPb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 --yPb(Cu.sub.1/2 W.sub.1/2)O.sub.3 --zPbTiO 3 wherein x, y and z are mol fractions of respective components and take a set of values falling within a polygon ABCD defined by points A, B, C and D in FIG. 1, and x+y+z=1.00. The set of x, y and z at each point is as follows: ______________________________________ x y z
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A 0.75 0.10 0.15
B 0.75 0.05 0.20
C 0.95 0.03 0.02
D 0.95 0.05 0.00
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A dielectric ceramic composition consisting essentially of a main component of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 --Pb(Cu 1/2 W 1/2 )O 3 --PbTiO 3 , and containing a glass composition of the BaO-SiO 2 system consisting essentially of 10 to 40 wt. % BaO, 20 to 60 wt. % SiO 2 , 1 to 20 wt. % Li 2 O, 1 to 10 wt. % CaO, 1 to 10 wt. % SrO, 1 to 15 wt. % Al 2 O 3 and 1 to 10 wt. % TiO 2 with a melting point of 600° to 900° C. in an amount of 0.5 to 1.5 parts by weight per 100 parts by weight of said main component, said main component having a composition represented by the general formula: xPb(Mg.sub.1/3 Nv.sub.2/3)O.sub.3 --yPb(Cu.sub.1/2 W.sub.1/2)O.sub.3 --zPbTiO.sub.3 wherein x, y and z are mol fractions of respective components and have a set of values falling with a polygon ABCD defined by points A, B, C and D in FIG. 1, and x+y+z=1.00, the set of x, y and z at each said point being as follows: ______________________________________
x y z
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A 0.75 0.10 0.15
B 0.75 0.05 0.20
C 0.95 0.03 0.02
D 0.95 0.05 0.00
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Claim 2
Dependent Claim
208 words
A dielectric ceramic composition consisting essentially of a main component of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 --Pb(Cu 1/2 W 1/2 )O 3 --PbTiO 3 , and containing a glass composition of the BaO-SiO 2 system consisting essentially of 10 to 40 wt. % BaO, 20 to 60 wt. % SiO 2 , 1 to 20 wt. % Li 2 O, 1 to 10 wt. % CaO, 1 to 10 wt. % SrO, 1 to 15 wt. % Al 2 O 3 and 1 to 10 wt. % TiO 2 with a melting point of 600° to 900° C. in an amount of 0.5 to 1.5 parts by weight per 100 parts by weight of said main component, said main component having a composition represented by the general formula: xPb(Mg.sub.1/3 Nv.sub.2/3)O.sub.3 --yPb(Cu.sub.1/2 W.sub.1/2)O.sub.3 --zPbTiO.sub.3 wherein x, y and z are mol fractions of respective components and have a set of values falling with a polygon ABCD defined by points A, B, C and D in FIG. 1, and x+y+z=1.00, the set of x, y and z at each said point being as follows: ______________________________________
x y z
______________________________________
A 0.75 0.10 0.15
B 0.75 0.05 0.20
C 0.95 0.03 0.02
D 0.95 0.05 0.00
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