Ionic Solid Dielectric Material for Wide-Temperature Resistance
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Solution Overview
Problem
Conventional dielectric and electrostrictive materials have limitations such as low initial electrical resistance, small resistance change, narrow temperature sensitivity, and directional operation constraints, which restrict their applications in thermistors and actuators.
Innovation Solution
A charge-separated ionic solid with non-coulombic forces, forming cation and anion clusters in specific structures, exhibits a large dielectric constant change and isotropic shrinkage upon voltage application, enabling superior performance in thermistors and actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CTR thermistors are used to achieve abrupt resistance change, then the resistance change magnitude is large (10³ times), but the temperature region is extremely narrow and initial resistance value is insufficient
Solution Approach 1:
The patent changes the fundamental material parameters by using charge-separated ionic solids with non-coulombic forces instead of conventional ionic solids. This parameter change enables the resistance to decrease by 10⁵ times or more over a wide temperature range (100-450K), simultaneously improving both the magnitude of resistance change and the width of the temperature region where this change occurs.
2Measurement precision
If NTC thermistors are used for temperature detection, then the resistance decreases with increasing temperature, but the decrease is slow and sensitivity is insufficient
Solution Approach 1:
The patent fundamentally changes the electrical resistance parameters by employing charge-separated ionic solids. The resistance decreases by 10⁵ times or more over the temperature range of 100-450K, which is significantly faster than conventional NTC thermistors. This parameter change dramatically improves temperature detection sensitivity while maintaining operation over a wide temperature range.
3Strength
If conventional electrostrictive materials are used for actuation, then the voltage application direction and actuation direction are the same, but mechanical change is limited and directional flexibility is poor
Solution Approach 1:
The patent inverts the conventional electrostrictive effect by using charge-separated ionic solids where the crystal shrinks isotropically upon voltage application, whereas conventional materials expand in the voltage application direction. This inversion enables mechanical change in all directions simultaneously and provides directional flexibility without requiring gears or other mechanical transmission components.
Solution Approach 2:
The patent changes the fundamental mechanical response parameters by employing charge-separated ionic solids with non-coulombic forces. The material exhibits isotropic shrinkage upon voltage application, producing large mechanical changes in all directions simultaneously. This parameter change enables versatile actuation applications without directional limitations.
4Reliability
If conventional dielectric materials are used, then the dielectric constant is relatively stable, but the change in dielectric constant over temperature is small
Solution Approach 1:
The patent fundamentally changes the dielectric parameters by employing charge-separated ionic solids. The dielectric constant changes significantly over the temperature range of 100-450K, whereas conventional dielectric materials exhibit relatively stable dielectric constants. This parameter change enables new applications in temperature-sensitive dielectric devices while maintaining operational reliability.
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 ionic solid achieves a significant electrical resistance change over a wide temperature range and isotropic shrinkage, enhancing the sensitivity and flexibility of thermistors and actuators, surpassing the limitations of conventional materials like lead zirconate titanate.
Implementation Method 1
exhibiting a considerably large change in dielectric constant over the range from 100 K to 450 K
Implementation Method 2
exhibiting a decrease in electrical resistivity to as low as 1/100,000 or less over the range from around room temperature to about 400 to 450 K
Implementation Method 3
its crystal isotropically shrinks as a whole upon voltage application, unlike conventional electrostrictive materials whose crystal, upon voltage application, expands in the voltage application direction and shrinks only in a direction orthogonal to the voltage application direction under the Poisson effect
Data Source
AI summary
Provided are a novel dielectric material and a novel electrostrictive material. The dielectric material or electrostrictive material comprises a charge-separation type non-coulombic ionic solid in which complex cations each composed of a metal element and a ligand are aggregated to form cation clusters, the cation clusters are arranged in a closest packed structure, and anions are aggregated to form anion clusters in interstices of the closest packed structure.