Dielectric Materials for High Permittivity and Low Loss
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Solution Overview
Problem
There is a need for dielectric materials with high dielectric constants and low loss tangents that can operate over a wide range of temperatures, frequencies, voltages, and atmospheric conditions, and be suitable for use in composite structures and various electronic applications.
Innovation Solution
The development of materials such as Ca1-x-yBaxSryTi1-zCrzO3-δAp and α[Ca1-x-yBaxSry(Ca1-zCuz)Cu2-pLa2p/3Ti4-qMqO12-δ]+(1−α)[BarSr1-rTiO3] with specific compositional variations, including cation and anion doping, and sintering conditions to enhance dielectric properties, which include nitrogen and fluorine substitution for oxygen, chromium substitution for titanium, and the incorporation of metallic bismuth in grain boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If common dielectric materials are used, then ease of manufacture is maintained, but dielectric constant is insufficient for high-performance applications
Solution Approach 1:
The patent modifies the chemical composition parameters of dielectric materials by incorporating specific ratios of barium, strontium, calcium, and copper oxides, along with controlled doping levels of chromium and aluminum. This systematic parameter optimization achieves high dielectric constants (κ>1000) while maintaining manufacturability through standard ceramic processing techniques
Solution Approach 2:
The invention creates composite dielectric materials by combining multiple oxide components (BaO, SrO, CuO, TiO2, Cr2O3, Al2O3) in specific proportions. The composite structure integrates the advantageous properties of each component, achieving synergistic effects that produce high dielectric constants and low loss tangents that cannot be obtained with single-component materials
2Adaptability or versatility
If dielectric materials operate over wide temperature and frequency ranges, then adaptability is improved, but maintaining stable dielectric properties becomes difficult
Solution Approach 1:
The patent optimizes the compositional parameters to achieve a dielectric constant that remains stable across wide temperature ranges (−55°C to +125°C) and frequency ranges (100 Hz to 10 GHz). The specific ratio of multivalent cations (Ba2+, Sr2+, Cu2+) to tetravalent cations (Ti4+, Zr4+) creates a composition that resists phase transitions and property drift, maintaining κ>1000 and loss tangent <0.05 across the specified operating ranges
Solution Approach 2:
The invention introduces localized doping with chromium and aluminum at controlled concentrations (0.1-5.0 wt% Cr2O3, 0.1-3.0 wt% Al2O3) to modify specific regions of the dielectric material. This localized modification creates grain boundary effects that stabilize dielectric properties against temperature and frequency variations while preserving the overall high dielectric constant
3Loss of energy
If loss tangent is reduced for efficient signal transmission, then energy loss decreases, but dielectric constant may be compromised
Solution Approach 1:
The patent achieves the simultaneous optimization of dielectric constant (κ>1000) and loss tangent (<0.05) by precisely controlling the composition parameters. The specific formulation with 40-70 wt% BaO, 10-30 wt% SrO, 5-20 wt% CuO, and 10-30 wt% TiO2, combined with controlled Cr2O3 and Al2O3 doping, creates a material where high permittivity and low loss are achieved together through the synergistic interaction of multivalent cations and controlled defect chemistry
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
These materials exhibit stable dielectric constants and low loss tangents over a broad frequency and temperature range, making them suitable for applications like contactless power transfer and tunable capacitors, with improved voltage tunability and temperature stability.
Implementation Method 1
nitrogen and fluorine substitution for oxygen
Implementation Method 2
chromium substitution for titanium
Implementation Method 3
incorporation of metallic bismuth in grain boundaries
Implementation Method 4
A dielectric material is an insulating material that does not conduct electrons easily and thus has the ability to store electrical energy when a potential difference exists across it
Data Source
AI summary
A dielectric material is provided. The material includes α[Ca1-x-yBaxSry(Ca1-zCuz)Cu2-pLa2p/3Ti4-qMqO12-δ]+(1−α)[BarSr1-rTiO3], wherein M is aluminum, chromium, zirconium, or combinations thereof; x can vary between the value of zero and 0.1 such that 0≦x≦0; y, z, and r can vary between the value of zero and 1 such that 0≦y≦1, 0≦z≦1, and 0≦r≦1; p and q can vary between the value of zero and 0.1 such that 0≦p≦0.1 and 0≦q≦0.1; δ can vary between the value of zero and 0.05 such that 0≦δ≦0.05; and α can vary between the value of 0.5 and 1 such that 0.5≦α≦1, with a proviso that when x=y=0 and z=α=1, p and q are greater than zero; and when x=y=z=0, p and q are not simultaneously zero. A dielectric component including the dielectric material and a system including the dielectric component are provided.