Dielectric Composition With Ta Gradient for Low Loss and AC Withstand
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Solution Overview
Problem
Existing dielectric compositions do not achieve high relative permittivity, low loss tangent, and high AC withstand voltage across a wide temperature range.
Innovation Solution
A dielectric composition comprising a composite oxide with specific ratios of barium, zirconium, and tantalum, where crystalline particles have a first area with higher tantalum content surrounded by a second area with lower tantalum content, enhancing sintering properties and insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing dielectric compositions are used, then manufacturing is simpler, but relative permittivity and loss tangent performance are insufficient across wide temperature ranges
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core region has high tantalum content (C1Ta) and the shell region has lower tantalum content (C2Ta). This non-uniform distribution optimizes dielectric properties: the high-Ta core provides high relative permittivity while the low-Ta shell reduces loss tangent and improves sintering, achieving excellent performance across wide temperature ranges without overly complicating the overall composition design.
Solution Approach 2:
The patent employs composite materials by combining barium zirconate and barium tantalate oxides in specific ratios (48.5-53.2 mol% BaO, 3.5-25.2 mol% ZrO2, 26.2-48.0 mol% Ta2O5). This composite approach leverages the complementary properties of different oxide systems to achieve high relative permittivity, low loss tangent, and improved AC withstand voltage while maintaining compositional control within defined ranges.
2Reliability
If uniform tantalum distribution is used in crystalline particles, then composition is simpler, but AC withstand voltage and insulation resistance are reduced
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core region has high tantalum content (C1Ta) and the shell region has lower tantalum content (C2Ta). This non-uniform distribution optimizes dielectric properties: the high-Ta core provides high relative permittivity while the low-Ta shell reduces loss tangent and improves sintering, achieving excellent performance across wide temperature ranges without overly complicating the overall composition design.
3Reliability
If high tantalum content is used throughout, then relative permittivity improves, but loss tangent increases and sintering properties deteriorate
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core region has high tantalum content (C1Ta) and the shell region has lower tantalum content (C2Ta). This non-uniform distribution optimizes dielectric properties: the high-Ta core provides high relative permittivity while the low-Ta shell reduces loss tangent and improves sintering, achieving excellent performance across wide temperature ranges without overly complicating the overall composition design.
Data Source
AI summary
A dielectric composition includes a composite oxide having barium, zirconium, and tantalum as a main component. Content ratios of barium in terms of BaO is 48.5 mol % or more and 53.2 mol % or less, zirconium in terms of ZrO2 is 3.5 mol % or more 25.2 mol % or less, and tantalum in terms of Ta2O5 is 26.2 mol % or more and 48.0 mol % or less in 100 mol % of the composite oxide. At least part of the crystalline particles includes a first area including tantalum and a second having a lower content ratio of tantalum than that in the first area. The second area partially or entirely surrounds the first. A content ratio of tantalum in the first area in terms of Ta2O5 represented by C1Ta (mol %) and one in the second in terms of Ta2O5 represented by C2Ta (mol %) satisfy a relation of C1Ta—C2Ta≥0.5 (mol %).