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[0011] Therefore, when a large amount of heat energy is applied to moderately dissolve Re, the solid solution of Re proceeds, but the segregation of Re also increases, and the reliability of thin-layer multilayer ceramic capacitors decreases on the contrary.
[0012] In addition, when the content of Re is greatly increased, the dielectric constant of the dielectric ceramic may decrease
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[0035] refer to figure 1 , the structure of the multilayer ceramic capacitor 1 used in the present invention will be described.
[0036]The multilayer ceramic capacitor 1 includes a laminated body 2 as a component main body. The laminated body 2 includes a plurality of stacked dielectric ceramic layers 3 and a plurality of internal electrodes 4 and 5 formed along specific interfaces between the dielectric ceramic layers 3 . The respective ends of the plurality of internal electrodes 4 and 5 are respectively exposed on one and the other end faces 6 and 7 of the laminated body 2, and the respective ends of these internal electrodes 4 and the respective ends of the internal electrodes 5 are electrically connected to each other, respectively. The external electrodes 8 and 9 are formed in a manner.
[0037] When manufacturing such a laminated ceramic capacitor 1 , first, a laminated body 2 in an unprocessed state is produced by a well-known method of laminating and printing ceram...
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Abstract
Provided is a laminated ceramic capacitor, wherein reliability is not lost even when dielectric ceramic layers and internal electrodes are made to be thinner layers. Heat treatment is conducted with a temperature profile starting from room temperature and ending at maximum temperature, and having an average temperature-rising rate of 40 DEG C / second or more, when firing, in a raw-state, a laminated body (2), which is provided with laminated ceramic layers (3) that contain dielectric ceramic raw-material powder, and internal electrodes (4 and 5), and which is for the laminated ceramic capacitor (1). BaTiO3 is the main ingredient of the dielectric ceramic raw-material powder, and Re (Re is at least one type selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) is contained as an accessory ingredient, with the Re content made to be 0.3-3 parts by mole for 100 parts by mole of the main ingredient.
Description
technical field [0001] The present invention relates to a method for manufacturing a multilayer ceramic capacitor and a multilayer ceramic capacitor, and particularly relates to improvement of firing conditions in the method for producing a multilayer ceramic capacitor, and BaTiO used for the multilayer ceramic capacitor suitable for the improved firing conditions 3 An improvement in the composition of the dielectric ceramic. Background technique [0002] In multilayer ceramic capacitors, in order to achieve miniaturization (thinning), it is effective not only to reduce the thickness of the dielectric ceramic layers but also to reduce the thickness of the internal electrodes. However, when the internal electrodes are thinned, electrode breakage tends to occur as a result of the firing step for sintering the untreated laminate. As a technique capable of suppressing the breakage of the electrode, for example, the following techniques have been proposed. [0003] In Japanese ...
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