Multilayer ceramic capacitor and method of manufacturing the same

A multilayer ceramic capacitor comprising:

• a multilayer body including a plurality of stacked dielectric layers including a dielectric ceramic that includes a plurality of crystal grains and a plurality of internal electrodes disposed at a plurality of interfaces between the dielectric layers;
• and
• an external electrode provided on an outer surface of the multilayer body and electrically connected to some of the plurality of inner electrode;
• wherein
• the multilayer body includes a Ba and Ti containing perovskite compound, and La, Mg, Mn and Al;
• in a case in which a content of Ti is set to 100 molar parts, a fraction of each content of La, Mg, Mn and Al relative to the content of Ti is such that La is about 0.2 to about 1.2 molar parts, Mg is about 0.1 molar part or less, Mn is about 1.0 to about 3.0 molar parts and Al is about 0.5 to about 2.5 molar parts;
• and
• an average number of the crystal grains included in each of the plurality of dielectric layers in a stacking direction is one or more to three or less.

A multilayer ceramic capacitor comprising:

• a multilayer body including a plurality of stacked dielectric layers including a dielectric ceramic that includes a plurality of crystal grains and a plurality of internal electrodes disposed at a plurality of interfaces between the dielectric layers;
• and
• an external electrode provided on an outer surface of the multilayer body and electrically connected to some of the plurality of inner electrode;
• wherein
• the multilayer body includes a Ba and Ti containing perovskite compound, and La, Mg, Mn and Al;
• in a case in which the multilayer body is subjected to a dissolution treatment to form a solution and a content of Ti is set to 100 molar parts, a fraction of each content of La, Mg, Mn and Al relative to the content of Ti is such that La is about 0.2 to about 1.2 molar parts, Mg is about 0.1 molar part or less, Mn is about 1.0 to about 3.0 molar parts and Al is about 0.5 to about 2.5 molar parts;
• and
• an average number of the crystal grains included in each of the plurality of dielectric layers in a stacking direction is one or more to three or less.

A multilayer ceramic capacitor comprising:

• a multilayer body including a plurality of stacked dielectric layers including a dielectric ceramic that includes a plurality of crystal grains and a plurality of internal electrodes disposed at a plurality of interfaces between the dielectric layers;
• and
• an external electrode provided on an outer surface of the multilayer body and electrically connected to some of the plurality of inner electrode;
• wherein
• the plurality of dielectric layers include a Ba and Ti containing perovskite compound, and La, Mg, Mn and Al;
• in a case in which a content of Ti is set to 100 molar parts, a fraction of each content of La, Mg, Mn and Al relative to the content of Ti is such that La is about 0.2 to about 1.2 molar parts, Mg is about 0.1 molar part or less, Mn is about 1.0 to about 3.0 molar parts and Al is about 0.5 to about 2.5 molar parts;
• and
• an average number of the crystal grains included in each of the dielectric layers in a stacking direction is one or more to three or less
• an average number of the crystal grains included in each of the plurality of dielectric layers in the stacking direction being one or more to three or less.

A method for manufacturing a multilayer ceramic capacitor which includes a multilayer body provided with a plurality of stacked dielectric layers including a dielectric ceramic that includes a plurality of crystal grains and a plurality of internal electrodes disposed at a plurality of interfaces between the dielectric layers, the method comprising the steps of:

• preparing a ceramic slurry by blending powder including a Ba and Ti containing perovskite compound, an La containing compound powder, an Mg containing compound powder, an Mn containing compound powder and an Al containing compound powder into a slurry in which a content of Ti is set to 100 molar parts, a fraction of each content of La, Mg, Mn and Al relative to the content of Ti is such that La is about 0.2 to about 1.2 molar parts, Mg is about 0.1 molar part or less, Mn is about 1.0 to about 3.0 molar parts and Al is about 0.5 to about 2.5 molar parts;
• obtaining a ceramic green sheet by forming the ceramic slurry into a sheet;
• providing an unfired multilayer body by stacking the ceramic green sheet and a conductor pattern which defines the plurality of internal electrodes after firing;
• and
• firing the unfired multilayer body to provide the multilayer body which is configured in such a manner that each of the plurality of internal electrodes are disposed between adjacent pairs of the plurality of dielectric layers, and an average number of the crystal grains included in each of the dielectric layers in a stacking direction is one or more to three or less.