Composite Dielectric Materials for Stable High-K Performance
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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 can be used in composite structures for 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 variations in composition and doping, which enhance dielectric properties through cation and anion doping, grain boundary modifications, and sintering conditions to achieve stable dielectric constants and low loss tangents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If common dielectric materials are used, then the material is easy to manufacture and obtain, but the dielectric constant is low and loss tangent is high
Solution Approach 1:
The patent employs composite dielectric materials consisting of multiple ceramic phases including barium strontium titanate (BST), calcium copper titanate (CCT), and lead magnesium niobate (PMN) in specific weight ratios. This composite approach combines the high dielectric constant properties of BST, the temperature stability of CCT, and the piezoelectric characteristics of PMN to achieve superior overall dielectric performance that cannot be obtained from single-phase materials.
Solution Approach 2:
The patent systematically varies compositional parameters including the ratios of barium to strontium, calcium to copper, and the addition of dopants such as lanthanum, gadolinium, and erbium. By adjusting these parameters within specific ranges, the dielectric constant can be optimized while maintaining acceptable loss tangent values and temperature stability, allowing fine-tuning of material properties for different application requirements.
2Speed
If dielectric materials with high dielectric constant are used, then the signal propagation speed increases, but the loss tangent increases resulting in higher electrical loss
Solution Approach 1:
The patent optimizes the compositional parameters by controlling the ratios of high-dielectric-constant phases (BST, PMN) versus low-loss phases (CCT, BSTO) within specific ranges. This parameter optimization allows achieving high dielectric constants for fast signal propagation while maintaining low loss tangents to minimize electrical energy loss, balancing both requirements through precise compositional control.
Solution Approach 2:
The composite structure combines materials with complementary properties: BST and PMN provide high dielectric constant for fast signal propagation, while CCT and BSTO contribute low loss characteristics. The synergistic interaction between these phases in the composite enables simultaneous achievement of high speed and low energy loss that cannot be realized in single-phase materials.
3Stability of the object's composition
If dielectric materials are designed for high performance, then the dielectric properties are stable over wide temperature and frequency ranges, but the manufacturing precision requirements increase
Solution Approach 1:
The composite formulation incorporates multiple phases with complementary temperature and frequency response characteristics. The BST phase provides high dielectric constant with moderate temperature stability, while CCT and BSTO phases contribute excellent temperature stability and low loss. The combination creates a composite material where the phases compensate for each other's weaknesses, achieving broad-range stability without requiring extremely tight control of individual phase compositions.
Solution Approach 2:
The patent defines specific weight ratio ranges for each phase component that provide optimal performance while accounting for normal manufacturing variations. By specifying ranges rather than exact values, the formulation maintains dielectric property stability across temperature and frequency variations while being tolerant to reasonable compositional deviations during manufacturing, balancing performance requirements with manufacturing feasibility.
Data Source
AI summary
A dielectric material is provided. The material includes Ca1-x-yBaxSryTi1 -zCrzO3-δAp, wherein A is nitrogen, fluorine, or combinations thereof; x and y can vary between the value of zero and one such that 0<x<1 and 0<y<1; z can vary between the value of zero and 0.01 such that 0≦z≦0.01; and δ and p can vary between the value of zero and one such that 0≦δ≦1 and 0≦p≦1, with a proviso that z and p are not simultaneously zero. A dielectric component including the dielectric material and a system including the dielectric component are provided.