Laminated ceramic capacitor

Abstract

By suppressing grain growth, which occurs when dielectric particles constituting a dielectric layer are fired to maintain grain boundaries, and by setting permittivity per unit grain size to a high value, high density laminated layers and improved reliability are both achieved in this laminated ceramic capacitor. The laminated ceramic capacitor has a dielectric layer constituting a sintered body containing, with respect to 100 moles of BaTiO3, amols of ReO3 / 2, bmols of SiO2, cmols of MOx, dmols of ZrO2, and emols of MgO (where Re is a rare earth element, M is a metal element (excluding Ba, Ti, Re, Si, Zr, Mg and rare earth elements), and x is a valence). The aforementioned a, b, c, d and e, which represent the number of moles of each component, are 0.1 <= a <= 1.0, 0.1 <= b <= 1.5, 0.1 <= c <= 0.4, 0 <= d <= 1.0, and 0 <= e <= 0.03.

Description

technical field [0001] The present invention relates to a multilayer ceramic capacitor (MLCC) capable of achieving a smaller and larger capacity by stacking dielectric layers at a high density. Background technique [0002] With the miniaturization and thinning of digital electronic devices such as mobile phones, in the multi-layer ceramic capacitor (MLCC: Multi-Layer ceramic capacitor) mounted on the electronic circuit board, the miniaturization and increase in the required chip size and capacity The demand is increasing year by year. In general, when the size of a capacitor is reduced, the area of ​​the internal electrodes facing the dielectric layer inevitably becomes smaller, thereby reducing the capacitance. Therefore, in order to achieve miniaturization of the chip size and secure the capacity of the capacitor, a high-density lamination technology of making the dielectric layer between the internal electrodes thin and stacking the dielectric layers in multiple layers ...

AI Technical Summary

Problems solved by technology

However, if the particle size of the dielectric is reduced while the dielectric layer is thinned, the dielectric constant will decrease due to the size effect, and a sufficient capacity cannot be obtained as a capacitor as a whole.

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