Abstract: A solid electrolytic capacitor that includes: an anode plate including a core portion, a porous layer having pores on at least one main surface of the core portion, and a dielectric layer on a surface of the porous layer and extending into the pores of the porous layer; and a cathode layer that includes a solid electrolyte layer on a surface of the dielectric layer. The solid electrolyte layer includes a conductive polymer layer inside the pores of the porous layer, the conductive polymer layer comprising a mixture of a conductive polymer and an insulating material. The insulating material is a material which contains an OH group, a COOH group, a CO group, or an NH2 group in a molecule, has hygroscopicity, and does not have a function as a dopant for the above-described conductive polymer.

Abstract: A dielectric composition that contains a first complex oxide represented by (BixNa1-x)TiO3—CaTiO3 and having a perovskite structure as a main component; and at least one second complex oxide having a perovskite structure selected from the group consisting of BaZrO3, SrZrO3, CaZrO3, NaNbO3, and NaTaO3 as an auxiliary component. A tolerance factor t when the at least one second complex oxide is BaZrO3, NaNbO3, or NaTaO3 is 0.9016?t?0.9035, a tolerance factor t when the at least one second complex oxide is SrZrO3 is 0.9005?t?0.9025, and a tolerance factor t when the at least one second complex oxide is CaZrO3 is 0.9000?t?0.9020.

Abstract: A solid electrolytic capacitor including: an anode plate having a porous layer on at least one main surface thereof; a dielectric layer on the porous layer; a cathode layer on the dielectric layer, the cathode layer including a solid electrolyte layer on the surface of the dielectric layer, and a conductor layer on a surface of the solid electrolyte layer, and the solid electrolyte layer including a first solid electrolyte layer in a region including an inside of pores of the dielectric layer, and a second solid electrolyte layer covering the first solid electrolyte layer; a mask layer made of an insulating material and located in a region surrounding the cathode layer at a peripheral edge of the porous layer; and a columnar layer made of an insulating material and located at a distance from the mask layer in a region surrounded by the cathode layer in the porous layer.

Abstract: A dielectric composition that contains a first complex oxide represented by (BixNa1?x)TiO3—CaTiO3 and having a perovskite structure as a main component; and at least one second complex oxide having a perovskite structure selected from the group consisting of BaZrO3, SrZrO3, CaZrO3, NaNbO3, and NaTaO3 as an auxiliary component. A tolerance factor t when the at least one second complex oxide is BaZrO3, NaNbO3, or NaTaO3 is 0.9016?t?0.9035, a tolerance factor t when the at least one second complex oxide is SrZrO3 is 0.9005?t?0.9025, and a tolerance factor t when the at least one second complex oxide is CaZrO3 is 0.9000 t<0.9020.

Abstract: A ceramic powder that contains 39.9 mol % to 47.0 mol % of Pb, 2.5 mol % to 6.7 mol % of La, more than 0 mol % to 4.4 mol % of Na, 42.6 mol % to 47.6 mol % of Zr, and more than 0 mol % to 6.2 mol % of Ti based on 100 mol % of a total amount of the Pb, the La, the Na, the Zr, and the Ti in the ceramic powder.