Abstract A dielectric ceramic composition consists essentially of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , Pb(Zn 1/2 W 1/2 )O 3 and M(Cu 1/3 Nb 2/3 )O 3 (wherein M represents at least one element selected from the group consisting of Ba, Sr and Ca), the mole percentages of said four components being as follows: ______________________________________ Pb(Ni 1/3 Nb 2/3 )O 3 45 to 75 mole %
PbTiO 3 20 to 40 mole %
Pb(Zn 1/2 W 1/2 )O 3 0.5 to 15 mole %
M(Cu 1/3 Nb 2/3 )O 3 1.0 to 10 mole %
______________________________________ The dielectric ceramic composition may further contain, as an additive, manganese in an amount of not more than 0.5 mole % in terms of MnO 2 . The composition possesses a high dielectric constant of not less than 8000 and a low sintering temperature of 900° to 1000° C.
A dielectric ceramic composition consisting essentially of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , Pb(Zn 1/2 W 1/2 )O 3 and M(Cu 1/3 Nb 2/3 )O 3 (wherein M represents at least one element selected from the group consisting of Ba, Sr and Ca), the mole percentages of said four components being as follows: ______________________________________
Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3
45 to 75 mole %
PbTiO.sub.3 20 to 40 mole %
Pb(Zn.sub.1/2 W.sub.1/2)O.sub.3
0.5 to 15 mole %
M(Cu.sub.1/3 Nb.sub.2/3)O.sub.3
1.0 to 10 mole %
______________________________________
Claim 2
Dependent Claim
86 words
A dielectric ceramic composition consisting essentially of Pb(Ni 1/3 Nb 2/3 )O 3 , PbTiO 3 , Pb(Zn 1/2 W 1/2 )O 3 and M(Cu 1/3 Nb 2/3 )O 3 (wherein M represents at least one element selected from the group consisting of Ba, Sr and Ca), the mole percentages of said four components being as follows: ______________________________________
Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3
45 to 75 mole %
PbTiO.sub.3 20 to 40 mole %
Pb(Zn.sub.1/2 W.sub.1/2)O.sub.3
0.5 to 15 mole %
M(Cu.sub.1/3 Nb.sub.2/3)O.sub.3
1.0 to 10 mole %
______________________________________
Claim 3
Dependent Claim
89 words
The dielectric ceramic composition according to claim 1 containing, as an additive, manganese in an amount of not more than 0.5 mole % in terms of MnO 2 with respect to one mole of its basic composition consisting essentially of 45 to 75 mole % of Pb(Ni 1/3 Nb 2/3 )O 3 , 20 to 40 mole % of PbTiO 3 , 0.5 to 15 mole % of Pb(Zn 1/2 W 1/2 )O 3 , and 1.0 to 10 mole % of M(Cu 1/3 Nb 2/3 )O 3 .
Claim 4
Dependent Claim
31 words
The dielectric ceramic composition according to claim 1 wherein said composition possesses a high dielectric constant of not less than 8000 and a low sintering temperature of 900° to 1000° C.