BaTiO3 Dielectric Composition for Stable Thin-Layer MLCC Capacitance

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Solution Overview

Problem

Multilayer ceramic capacitors face challenges in maintaining reliability and effective capacitance due to sensitivity to changes in temperature and electric fields, especially with thin dielectric layers, which are prone to grain growth and reduced temperature stability.

Innovation Solution

A dielectric ceramic composition incorporating barium titanate (BaTiO3) with zinc oxide (ZnO) as a subcomponent, controlled within specific content ranges, to inhibit grain growth and enhance temperature stability, thereby improving reliability under DC electric fields.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the thickness of the dielectric layer is reduced to achieve miniaturization and high capacity, then the size is reduced and capacity increases, but the dielectric layer becomes more sensitive to temperature changes and electric fields, reducing reliability

Engineering Contradiction:

Improvesize of multilayer ceramic capacitorVSAvoidreliability of dielectric layer

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the dielectric material by incorporating specific amounts of ZnO (0.01-5 wt%), MnO (0.01-5 wt%), and NiO (0.01-5 wt%) into the barium titanate-based system. These compositional adjustments modify the dielectric properties to reduce sensitivity to temperature and electric field variations, thereby improving reliability while maintaining thin film dimensions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite dielectric material system combining barium titanate base material with multiple oxide additives (ZnO, MnO, NiO). This composite approach leverages the synergistic effects of different materials to achieve both thin film compatibility and enhanced stability against temperature and electric field variations

Inventive Principle:

Principle #40Composite materials

2Volume of moving object

If the thickness of the dielectric layer is reduced to achieve miniaturization and high capacity, then the size is reduced and capacity increases, but grain growth occurs more easily, degrading temperature characteristics

Engineering Contradiction:

Improvesize of multilayer ceramic capacitorVSAvoidtemperature characteristics

Core Design Contradiction:

Volume of moving objectVSStability of the object's composition

Solution Approach 1:

The patent adjusts compositional parameters by adding specific oxide compounds to control grain growth kinetics. The ZnO, MnO, and NiO additives modify the sintering behavior and grain boundary properties, suppressing excessive grain growth in thin films while maintaining densification, thereby preserving temperature characteristics in miniaturized capacitors

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If a large electric field per unit thickness is applied to achieve high capacity in thin films, then the capacitance increases, but the dielectric layer becomes more sensitive to temperature changes and reliability decreases

Engineering Contradiction:

ImprovecapacitanceVSAvoidstability under DC electric field

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent modifies the dielectric material composition to alter its electrical properties, specifically reducing the change in permittivity under DC electric fields. The added oxides adjust the dielectric response characteristics, enabling the material to maintain stable capacitance values even under the high electric fields necessary for thin-film high-capacity capacitors

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition reduces effective capacity change rates and enhances reliability by suppressing grain growth, ensuring stable capacitance and temperature characteristics in high-frequency applications.

Implementation Method 1

Methodology Applied

Scientific EffectGrain growth inhibition:

Data Source

PatentUS12488941B2Dielectric ceramic composition and multilayer ceramic capacitor comprising same

Publication Date: 2025.12.02 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A dielectric ceramic composition and a multilayer ceramic capacitor including the same are provided, the dielectric ceramic composition includes a BaTiO3-based base material main component and a subcomponent, wherein the subcomponent includes zinc oxide (ZnO) as a first subcomponent, and the content of the ZnO is 0.1 mol % or more and less than 0.4 mol % with respect to 100 mol % of the base material main component.