Multilayer ceramic capacitor and method for producing the same
AssigneeMurata Manufacturing Co., Ltd.
InventorShinichi Yamaguchi
Life of this patent
Estimating the term…
Abstract
A multilayer ceramic capacitor includes a multilayer body including dielectric layers, inner-electrode layers, and outer electrodes coupled to the inner-electrode layers. The multilayer body includes Ba, Ti, Ca, Mg, Zr, and R, and when the Ti content is defined as 100 parts by mole, the relative amounts are as follows: Ca, 0.03 parts by mole or more and 0.15 parts by mole or less, Mg, 0.01 parts by mole or more and 0.09 parts by mole or less, R, 2.5 parts by mole or more and 8.4 parts by mole or less; Zr, 0.05 parts by mole or more and 3.00 parts by mole or less: Si, 0.5 parts by mole or more and 4.0 parts by mole or less; and P, 0.005 parts by mole or more and 0.500 parts by mole or less. Ca is in a vicinity of the center of crystal grains contained in the dielectric layers.
Claims14
A multilayer ceramic capacitor comprising:
- a multilayer body including a stack of a plurality of dielectric layers;
- a plurality of inner-electrode layers in the multilayer body, alternating with the dielectric layers;
- and
- a pair of outer electrodes on a surface of the multilayer body, and electrically coupled to a portion of the inner-electrode layers exposed on the surface of the multilayer body;
- wherein
- the plurality of dielectric layers include Ba, Ti, Ca, Mg, R, and Zr;
- the R includes at least one of Y, La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb;
- when a Ti content is defined as 100 parts by mole, relative amounts of elements are as follows:
- Ca, about 0.03 parts by mole or more and about 0.15 parts by mole or less;
- Mg, about 0.01 parts by mole or more and 0.09 parts by mole or less;
- R, more than 6.0 parts by mole and about 8.4 parts by mole or less;
- Zr, about 0.05 parts by mole or more and about 3.00 parts by mole or less;
- Si, about 0.5 parts by mole or more and about 4.0 parts by mole or less;
- and
- P, about 0.005 parts by mole or more and about 0.500 parts by mole or less;
- Ca is provided in a vicinity of a center of crystal grains included in the dielectric layers;
- and
- the crystal grains are made primarily of barium calcium titanate.
A multilayer ceramic capacitor comprising:
- a multilayer body including a stack of a plurality of dielectric layers;
- a plurality of inner-electrode layers in the multilayer body, alternating with the dielectric layers;
- and
- a pair of outer electrodes on a surface of the multilayer body, and electrically coupled to a portion of the inner-electrode layers exposed on the surface of the multilayer body;
- wherein
- the multilayer body includes Ba, Ti, Ca, Mg, R, and Zr;
- the R includes at least one of Y, La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb;
- when a Ti content is defined as 100 parts by mole, relative amounts of elements are as follows:
- Ca, about 0.03 parts by mole or more and about 0.15 parts by mole or less;
- Mg, about 0.01 parts by mole or more and 0.09 parts by mole or less;
- R, more than 6.0 parts by mole and about 8.4 parts by mole or less;
- Zr, about 0.05 parts by mole or more and about 3.00 parts by mole or less;
- Si, about 0.5 parts by mole or more and about 4.0 parts by mole or less;
- and
- P, about 0.005 parts by mole or more and about 0.500 parts by mole or less;
- Ca is provided in a vicinity of a center of crystal grains contained in the dielectric layers;
- and
- the crystal grains are made primarily of barium calcium titanate.
Dependencies are inferred from the claim text.