Samarium-Doped BaTiO3 Dielectric for High Permittivity
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Solution Overview
Problem
Existing dielectric compositions for multilayer ceramic capacitors face challenges in achieving high permittivity without particle growth, leading to increased capacitance change rates with temperature and DC voltage, which compromises reliability.
Innovation Solution
A dielectric ceramic composition incorporating samarium (Sm) and other rare earth elements with a specific ratio (0.1≦a/b≦2.0) as an accessory ingredient, combined with a main base material such as BaTiO3, to enhance permittivity without particle growth, ensuring high reliability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If particle growth is used to adjust the number of dipoles in crystals to achieve high permittivity, then permittivity is improved, but the rate of change of capacitance with temperature and DC voltage increases, and the number of particles per layer decreases, deteriorating reliability
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific rare earth elements (samarium and other rare earth elements with a/b ratio between 0.1 and 2.0) as accessory ingredients in the dielectric ceramic composition. This compositional parameter change increases permittivity through enhanced dipole moments without requiring particle growth, thereby maintaining reliability by preserving the number of particles per layer and stabilizing capacitance characteristics.
Solution Approach 2:
The patent creates a composite dielectric ceramic material by combining the main base material (such as barium titanate) with rare earth element-containing accessory ingredients. This composite structure achieves high permittivity through the synergistic effect of the base material and rare earth dopants, which modify the crystal lattice and increase dipole density without causing excessive particle growth, thus maintaining both permittivity and reliability.
2Productivity
If dielectric layers are thinned to achieve high capacitance and small size, then capacitance and compactness are improved, but reliability deteriorates due to increased sensitivity to composition changes and reduced number of particles per layer
Solution Approach 1:
The patent modifies the chemical composition parameters of the dielectric layer by incorporating rare earth elements as accessory ingredients. This parameter change enables the use of thinner dielectric layers while maintaining reliability, as the compositional modification compensates for the reduced thickness by increasing permittivity through enhanced dipole moments rather than relying on particle growth.
Solution Approach 2:
The patent applies local quality enhancement by introducing rare earth elements at specific concentrations (with controlled a/b ratios) within the dielectric ceramic composition. This localized compositional modification creates regions with enhanced dipole moments and improved electrical properties, allowing thin dielectric layers to achieve high capacitance density while maintaining reliability through controlled material properties.
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 achieves high permittivity and excellent reliability by controlling lattice defects and ion point defects, maintaining stability even at thin dielectric layers, with improved room-temperature insulation resistance and high-temperature withstand voltage characteristics.
Implementation Method 1
the first accessory ingredient contains samarium (Sm) and other rare earth (RE) elements, and 0.1≦a/b≦≦2.0, where a is a content of samarium (Sm) and b is a content of other rare earth elements in the first accessory ingredient
Data Source
AI summary
There are provided a dielectric ceramic composition and a multilayer ceramic capacitor containing the same. The dielectric ceramic composition according to the present disclosure may contain a main base material ingredient and a first accessory ingredient, wherein the first accessory ingredient contains samarium (Sm) and other rare earth (RE) elements, and a ratio (a/b) of a content (a) of samarium (Sm) to a content (b) of other rare earth elements in the first accessory ingredient satisfies 0.1≦a/b≦2.0.