Ferroelectric Precursor Composition with Reversible Ester Bonds
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Solution Overview
Problem
Existing methods for forming ferroelectric films, such as sol-gel and metalorganic deposition, face challenges in composition control and waste management, particularly with lead-containing ferroelectrics, and require high crystallization temperatures, limiting the efficiency and environmental impact of the processes.
Innovation Solution
A precursor composition is developed with a general formula AB1-XCXO3, including Pb, Zr, Ti, V, W, Hf, Nb, and Ta, dissolved in an organic solvent with ester bonds, allowing for reversible reactions and recycling of metal components, and applied using an inkjet coating method to reduce environmental impact and improve composition control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sol-gel method is used with metal alkoxide and hydrolysis-condensation, then composition controllability is improved, but the reaction is irreversible and lead waste cannot be processed
Solution Approach 1:
The patent changes the chemical parameters of the sol-gel method by using carboxylic acid or carboxylic acid ester instead of traditional metal alkoxide, and uses esterification reaction instead of hydrolysis-condensation. This parameter change makes the reaction reversible, allowing lead waste to be processed and recycled while maintaining composition controllability.
Solution Approach 2:
The patent converts the harmful irreversible hydrolysis-condensation reaction into a beneficial reversible esterification reaction. The reversibility allows lead-containing waste to be recovered and reused, transforming an environmental hazard into a recyclable resource while maintaining the composition precision of the ferroelectric film.
2Ease of operation
If MOD method is used with stable organometallic compound, then solution composition adjustment and handling are facilitated, but crystallization temperature is increased and crystal grain size is increased
Solution Approach 1:
The patent changes the raw material from stable organometallic compound to metal alkoxide with carboxylic acid/ester, which modifies the decomposition characteristics. This parameter change lowers the crystallization temperature from the high temperatures required by MOD method to a more moderate range, enabling better control over crystal grain size while maintaining ease of solution handling.
3Manufacturing precision
If sol-gel method is used with irreversible hydrolysis-condensation, then composition controllability is improved, but the crosslinked polymerized metal alkoxide cannot be used as raw material
Solution Approach 1:
The patent inverts the traditional sol-gel approach by using esterification instead of hydrolysis-condensation. This inversion makes the reaction reversible, allowing the crosslinked polymerized product to be decomposed and reused as raw material, thereby improving adaptability and versatility while maintaining composition controllability.
4Reliability
If MOD method decomposes high molecular weight organic group in oxygen atmosphere, then complex oxide is formed, but crystallization temperature is increased
Solution Approach 1:
The patent changes the decomposition mechanism by using esterification of metal alkoxide with carboxylic acid or ester, which decomposes at lower temperatures compared to the oxygen atmosphere decomposition required by MOD method. This parameter change maintains reliable complex oxide formation while significantly reducing crystallization temperature.
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 approach enables the formation of ferroelectric films with excellent composition controllability, reduced crystallization temperatures, and minimized lead usage, resulting in improved hysteresis characteristics, leakage resistance, and insulating properties while facilitating the recycling of toxic materials.
Implementation Method 1
part of the precursor including an ester bond
Implementation Method 2
The sol-gel method uses a solution of a precursor prepared by polymerizing a compound such as a metal alkoxide by hydrolysis and polycondensation
Implementation Method 3
the organic solvent including at least a first alcohol and a second alcohol having a boiling point and viscosity higher than a boiling point and viscosity of the first alcohol
Implementation Method 4
reduced crystallization temperatures
Implementation Method 5
applied using an inkjet coating method
Implementation Method 6
heat-treating the applied inkjet coating ink
Data Source
AI summary
A precursor composition including a precursor for forming a ferroelectric, the ferroelectric being shown by a general formula AB1-XCXO3, an element A including at least Pb, an element B including at least one of Zr, Ti, V, W, and Hf, an element C including at least one of Nb and Ta, the precursor including at least the element B and the element C and part of the precursor including an ester bond, the precursor being dissolved or dispersed in an organic solvent, and the organic solvent including at least a first alcohol and a second alcohol having a boiling point and viscosity higher than a boiling point and viscosity of the first alcohol.