Colloidal Solution for Ferroelectric Thin Film Formation
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Solution Overview
Problem
Existing ferroelectric thin film formation compositions tend to produce films with low storage stability and poor quality, leading to fluctuations in piezoelectric characteristics, which affect the reliability of piezoelectric elements and liquid ejection characteristics in devices like liquid-jet heads.
Innovation Solution
A colloidal solution with an average particle diameter of 1 to 100 nm, containing metals like Pb, Zr, and Ti, and having a particle size distribution with two or more peaks, is used to form a dense and stable ferroelectric thin film. This solution includes colloidal particles such as lead acetate, zirconium acetylacetonate, and titanium alkoxides, with specific diameter ranges to enhance film quality and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional composition for ferroelectric thin film formation is used, then the film formation process is simple, but the storage stability is poor and film quality is low
Solution Approach 1:
The patent uses a composite colloidal solution containing multiple metal organic compounds (lead acetate, zirconium acetylacetonate, titanium alkoxide) with different molecular weights and hydrolysis rates. This composite approach enables the formation of dense ferroelectric thin films with excellent storage stability while maintaining reasonable process complexity through controlled chemical reactions.
Solution Approach 2:
The patent optimizes specific parameters including colloidal particle diameter (1-100 nm average), metal organic compound ratios, and hydrolysis conditions. By precisely controlling these parameters, the invention achieves high storage stability and film quality without excessively complicating the preparation process.
2Manufacturing precision
If conventional composition for ferroelectric thin film formation is used, then the coating process is straightforward, but the piezoelectric characteristics fluctuate
Solution Approach 1:
The composite colloidal solution containing lead acetate, zirconium acetylacetonate, and titanium alkoxide in specific ratios ensures consistent piezoelectric characteristics. The synergistic interaction of these metal organic compounds produces dense films with uniform properties, reducing fluctuations in piezoelectric performance.
Solution Approach 2:
The patent creates local quality variations within the colloidal solution by incorporating metal organic compounds with different hydrolysis rates and molecular weights. This results in uniform nucleation and growth of ferroelectric crystals throughout the film, ensuring consistent piezoelectric characteristics across the entire film area.
3Manufacturing precision
If colloidal particles with single peak size distribution are used, then the synthesis process is simple, but the film density is insufficient
Solution Approach 1:
The patent deliberately creates a multi-peak particle size distribution (1-100 nm) through controlled hydrolysis of metal organic compounds. This specific particle size distribution enables better film densification during the coating and firing processes, as smaller particles fill voids between larger particles, increasing overall film density.
Solution Approach 2:
The hydrolysis process is controlled to occur in stages, first forming smaller colloidal particles, then gradually growing them into a bimodal or multimodal size distribution. This periodic particle formation mechanism ensures optimal film density without requiring complex post-synthesis processing.
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 solution achieves a dense and stable ferroelectric thin film with improved storage stability and consistent piezoelectric characteristics, ensuring reliable liquid ejection in liquid-jet heads and other applications.
Implementation Method 1
A ferroelectric thin film is formed, for example, by coating a composition for ferroelectric thin film formation (a colloidal solution) on a subject material, then drying and firing the coating
Implementation Method 2
coating a composition for ferroelectric thin film formation (a colloidal solution) on a subject material, then drying and firing the coating
Data Source
AI summary
A composition for ferroelectric thin film formation, comprising at least a colloidal solution containing metals serving as materials constituting a ferroelectric thin film, the colloidal solution having an average colloidal particle diameter of 1 to 100 nm, and obtaining a particle size distribution having two or more peaks; a ferroelectric thin film formed from the composition for ferroelectric thin film formation, and a liquid-jet head equipped with a piezoelectric element having the ferroelectric thin film.