Multilayer ceramic substrate and method for manufacturing multilayer ceramic substrate

A multilayer ceramic substrate comprising:

• a laminate having a plurality of stacked ceramic layers, an internal electrode disposed between predetermined layers of the plurality of ceramic layers,
• wherein the ceramic layers comprise a ceramic material having a main component containing 48 to 75% by weight of Si, 20 to 40% by weight of Ba, and 10 to 40% by weight of Al, and an auxiliary component containing at least 2.5 to 20 parts by weight of Mn with respect to 100 parts by weight of the main component;
• a first glass ceramic layer in the laminate, wherein at least a portion of a thickness of the first glass ceramic layer exists within 100 μm inside of the laminate measured from a first principal surface of the laminate, and wherein the first glass ceramic layer comprises a material containing a glass component mainly composed of BaO—Al2O3—SiO2—B2O3—CaO and Al2O3;
• and
• a second glass ceramic layer in the laminate, wherein at least a portion of a thickness of the second glass ceramic layer exists within 100 μm inside of the laminate measured from a second principal surface of the laminate, the second principal surface opposing the first principal surface, and
• wherein a first glass concentration of a first ceramic layer of the plurality of stacked ceramic layers between the first principal surface of the laminate and the first glass ceramic layer and a second glass concentration of a second ceramic layer of the plurality of stacked ceramic layers between the second principal surface of the laminate and the second glass ceramic layer are higher than a third glass concentration of a third ceramic layer of the plurality of stacked ceramic layers between the first glass ceramic layer and the second glass ceramic layer.