Amorphous Ce-Al Oxide Dielectric for High-Capacitance Capacitors
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Solution Overview
Problem
Existing capacitors with metal oxide dielectrics face challenges in maintaining low dielectric loss and increasing capacitance, as the surface area expansion of porous electrodes is limited, and dielectric losses are difficult to manage effectively.
Innovation Solution
A dielectric comprising a composite oxide with the composition CexAl1-xOk, where 0.400≤x<0.900, is used, which is amorphous and maintains electroneutrality, allowing for a high dielectric constant and low dielectric loss tangent, thereby enhancing capacitance and reducing dielectric loss in capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the surface area of porous electrodes is expanded to increase capacitance, then the capacitance increases, but the dielectric loss increases
Solution Approach 1:
The invention changes the chemical composition parameters of the dielectric oxide film by controlling the ratio of rare earth elements to transition metal elements (specifically maintaining rare earth element content at 80 at% or more), which fundamentally alters the dielectric properties to achieve low dielectric loss while maintaining high capacitance
Solution Approach 2:
The invention uses a composite oxide structure combining rare earth elements (such as La, Ce, Pr, Nd) with transition metal elements (such as Mn, Fe, Co, Ni) to create a dielectric material that exhibits both high capacitance and low dielectric loss, leveraging the complementary properties of different elements
2Ease of manufacture
If conventional metal oxide dielectrics are used, then the manufacturing process is simple, but the dielectric loss cannot be maintained low
Solution Approach 1:
The invention modifies the compositional parameters of conventional metal oxide dielectrics by incorporating specific rare earth elements at controlled ratios, which dramatically reduces dielectric loss while maintaining compatibility with existing anodic oxidation manufacturing processes
3Quantity of substance
If the dielectric constant is increased to enhance capacitance, then the capacitance increases, but the dielectric loss tangent increases
Solution Approach 1:
The invention optimizes the compositional parameters of the dielectric by controlling the ratio of rare earth elements to transition metal elements and adjusting the oxygen content, achieving a dielectric constant of 10 or more while maintaining a dielectric loss tangent of 0.05 or less
Solution Approach 2:
The invention creates a composite oxide dielectric combining rare earth elements with high dielectric constant contributions and transition metal elements with low loss characteristics, achieving simultaneous high capacitance and low dielectric loss tangent
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 composite oxide dielectric achieves a high dielectric constant and low dielectric loss tangent, increasing capacitance while maintaining low dielectric loss, making it suitable for capacitors and electronic components.
Implementation Method 1
the composite oxide being amorphous, wherein in the composition, a requirement 0.400≤x<0.900 is satisfied, and a dielectric including the composite oxide is likely to have a high dielectric constant and a low dielectric loss tangent
Data Source
AI summary
A dielectric includes a composite oxide. The composite oxide has composition represented by CexAl1-xOk and is amorphous. In the composition represented by CexAl1-xOk, a requirement 0.400≤x<0.900 is satisfied. The symbol k is a value for maintaining electroneutrality of the composite oxide.