Dielectric ceramic and capacitor
AssigneeKYOCERA Corporation
InventorsYusuke Azuma, Daisuke Fukuda
Life of this patent
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Abstract
A dielectric ceramic includes crystal grains containing barium titanate as a main component, magnesium, a rare-earth element, and manganese, wherein the crystal grains have a cubic crystal structure; and the dielectric ceramic contains, per mole of barium, 0.033 to 0.085 mol of magnesium in terms of MgO, 0.1 to 0.2 mol of the rare-earth element (RE) in terms of RE2O3, and 0.006 to 0.018 mol of manganese in terms of MnO. Such a dielectric ceramic has a high relative dielectric constant, stable temperature characteristic of the relative dielectric constant, and no spontaneous polarization.
Claims15
-4. (canceled)
A dielectric ceramic comprising:
- barium titanate;
- magnesium at a concentration in terms of MgO in a range of about 0.033 mol to about 0.085 mol per mole of barium;
- a rare-earth element at a concentration in terms of RE2O3 in a range of about 0.1 mol to about 0.2 mol per mole of barium;
- manganese at a concentration in terms of MnO in a range of about 0.006 mol to about 0.018 mol per mole of barium;
- and
- a plurality of crystal grains comprising the barium titanate as a main component, the magnesium, the rare-earth element, and the manganese, wherein the crystal grains have a cubic crystal structure.
A capacitor, comprising:
- a dielectric ceramic comprising:
- barium titanate;
- magnesium at a concentration in terms of MgO in a range of about 0.033 mol to about 0.085 mol per mole of barium;
- a rare-earth element at a concentration in terms of RE2O3 in a range of about 0.1 mol to about 0.2 mol per mole of barium;
- manganese at a concentration in terms of MnO in a range of about 0.006 mol to about 0.018 mol per mole of barium;
- a plurality of crystal grains comprising the barium titanate as a main component, the magnesium, the rare-earth element, and the manganese, wherein the crystal grains have a cubic crystal structure;
- at least one dielectric layer comprising the dielectric ceramic;
- and
- at least one conductor layer.
Dependencies are inferred from the claim text.