Dielectric ceramic composition
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United States of America Patent
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Aug 8, 1995
Grant Date -
N/A
app pub date -
Jun 30, 1994
filing date -
Jun 30, 1993
priority date (Note) -
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Abstract
A dielectric ceramic composition consists essentially of a main component of a four component system, Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 --PbTiO.sub.3 --Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 --Pb(Zn.sub.1/2 W.sub.1/2)O.sub.3, of which a part of Pb is replaced with at least one substituent selected from the group consisting of Ba, Ca and Sr; and a secondary component selected from the group consisting of w, Zn and Mg. The secondary component is incorporated in the main component in an amount of 0.05 to 10.0 parts by weight per 100 parts by weight of the main component in terms of each oxide, WO.sub.3, ZnO or MgO. The main component consists essentially of 4.0 to 93.0 mol % of Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3, 1.5 to 35.0 mol % of PbTiO.sub.3, 1.5 to 51.0 mol % of Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3, and 1.0 to 34.0 mol % of Pb(Zn.sub.1/2 W.sub.1/2)O.sub.3, the amount of at least one substituent for Pb being 0.1 to 10 mol %.
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