BaTiO3 Dielectric Composition for Stable Thin-Layer MLCCs
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Solution Overview
Problem
Multilayer ceramic capacitors with thin dielectric layers face challenges in reliability due to sensitivity to temperature changes and electric fields, requiring a dielectric material with stable permittivity under varying conditions.
Innovation Solution
A dielectric ceramic composition based on barium titanate (BaTiO3) with zinc oxide (ZnO) as a subcomponent, where ZnO content is between 0.1 mol% and 0.4 mol% relative to the base material, is used to inhibit grain growth and improve temperature stability and capacitance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the dielectric layer is reduced to achieve miniaturization and high capacity, then the size and capacitance performance are improved, but the reliability deteriorates due to sensitivity to temperature changes and electric fields
Solution Approach 1:
The patent modifies the chemical composition parameters of the dielectric material by incorporating specific amounts of ZnO (0.01-0.5 wt%), MnO (0.01-0.5 wt%), and Nb2O5 (0.01-0.5 wt%) into the BaTiO3-based system. These compositional changes stabilize the permittivity against temperature and electric field variations, enabling thin dielectric layers to maintain reliability while achieving miniaturization and high capacitance.
Solution Approach 2:
The patent creates a composite dielectric material system combining BaTiO3 base material with multiple oxide additives (ZnO, MnO, Nb2O5). This composite approach leverages the synergistic effects of different materials: BaTiO3 provides high permittivity, ZnO stabilizes grain growth, MnO improves temperature stability, and Nb2O5 enhances electrical properties. The composite material achieves both thin-layer reliability and high-capacity performance.
2Quantity of substance
If the thickness of the dielectric layer is reduced to achieve high capacity, then the capacitance per unit volume is improved, but the permittivity stability under external electric field deteriorates
Solution Approach 1:
The patent adjusts the chemical composition parameters by adding specific concentrations of ZnO (0.01-0.5 wt%), MnO (0.01-0.5 wt%), and Nb2O5 (0.01-0.5 wt%) to the BaTiO3-based dielectric material. These compositional modifications stabilize the domain structure and reduce the sensitivity of permittivity to external DC electric fields, allowing thin dielectric layers to maintain stable capacitance characteristics under operating conditions.
Solution Approach 2:
The patent introduces MnO and Nb2O5 as intermediary substances that mediate the interaction between the dielectric layer and external electric fields. MnO acts as a grain boundary modifier that stabilizes the microstructure, while Nb2O5 provides electrical stabilization. These intermediaries protect the thin dielectric layer from electric field-induced permittivity changes, enabling high capacitance with stable performance.
3Volume of moving object
If the thickness of the dielectric layer is reduced to achieve miniaturization, then the number of stacked layers is increased, but the sensitivity to temperature changes increases
Solution Approach 1:
The patent modifies the chemical composition by incorporating ZnO (0.01-0.5 wt%), MnO (0.01-0.5 wt%), and Nb2O5 (0.01-0.5 wt%) into the BaTiO3-based dielectric system. These compositional changes create a more temperature-stable microstructure with controlled grain growth and stabilized domain configurations, reducing the temperature coefficient of capacitance and enabling thin-layer capacitors to maintain stable performance across temperature ranges.
Solution Approach 2:
The patent introduces MnO and Nb2O5 as intermediary substances that buffer the thermal effects on the thin dielectric layer. MnO acts as a grain boundary phase that stabilizes the microstructure against thermal expansion and phase transitions, while Nb2O5 provides thermal and electrical stabilization. These intermediaries protect the miniaturized capacitor from temperature-induced performance degradation.
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 controlled addition of ZnO reduces the effective capacity change rate and enhances reliability under DC electric fields, maintaining stability and performance in high-frequency, low-electric-field environments.
Implementation Method 1
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
Implementation Method 2
it is necessary to develop a dielectric material having a small change in permittivity due to an external electric field (DC) and a temperature change
Data Source
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.