Core-Shell Dielectric Powder for High Capacitance Multilayer Ceramic Capacitors
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Solution Overview
Problem
Conventional multilayer ceramic capacitors face limitations in achieving ultra-high capacitance and miniaturization due to low dielectric properties of BaTiO3 and constraints on the number of dielectric layers that can be stacked, necessitating a high dielectric constant in the dielectric material itself.
Innovation Solution
A dielectric powder with a core-shell structure is developed, where the core region is formed by doping barium titanate with a metal oxide and the shell region is made of a ferroelectric material, enhancing the dielectric constant while maintaining reliability through controlled grain growth and low-temperature firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If BaTiO3 is used as dielectric material with conventional perovskite structure, then the material can be easily manufactured, but the dielectric constant is low due to neutralized dipole moment and increased cubic image ratio
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core region contains BaTiO3 doped with metal oxide to enhance dielectric properties locally, while the shell region provides protective and functional characteristics. This localized modification allows the material to maintain ease of manufacture while achieving high dielectric constant through targeted compositional changes in the core region.
Solution Approach 2:
The patent employs composite materials by combining BaTiO3 with metal oxide dopants in the core region and surrounding it with a shell region of different material composition. This composite structure synergistically combines the advantages of different materials to achieve both high dielectric constant and reliability, overcoming the limitations of pure BaTiO3 with conventional perovskite structure.
2Reliability
If the number of dielectric layers is increased to achieve higher capacitance, then the capacitance increases, but the product size exceeds the preset limitations for miniaturization
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the dielectric constant parameter of the dielectric material itself through doping BaTiO3 with metal oxide and creating a core-shell structure. This increases the dielectric constant to 100 or more, allowing higher capacitance to be achieved within the same volume without increasing the number of layers, thus maintaining miniaturization requirements while achieving ultra-high capacitance.
3Stability of the object's composition
If atomization proceeds to reduce dipole moment neutralization, then the cubic image ratio increases, but the dielectric properties deteriorate
Solution Approach 1:
The patent applies local quality by concentrating the doped metal oxide in the core region of the particles, creating a localized zone with enhanced dielectric properties. This allows the core to maintain stable dipole characteristics while the overall particle structure achieves high dielectric constant, resolving the contradiction between dipole moment stability and dielectric properties.
Solution Approach 2:
The patent employs composite materials by combining BaTiO3 with metal oxide dopants in the core region, creating a composite structure that maintains stable dipole moments while achieving superior dielectric properties. The composite nature allows simultaneous optimization of both dipole stability and dielectric performance.
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 dielectric powder achieves a dielectric constant two or more times that of conventional powders, improving capacitance and reliability of multilayer capacitors without excessive grain growth, enabling high capacitance in a compact size.
Implementation Method 1
The core region includes barium titanate (BaTiO3) doped with a metal oxide
Implementation Method 2
the shell region is formed of a ferroelectric material
Data Source
AI summary
A dielectric powder includes a core-shell structure including a core region formed in an inner portion thereof and a shell region covering the core region. The core region includes barium titanate (BaTiO3) doped with a metal oxide, and the shell region is formed of a ferroelectric material.