Barium Titanate Coating Liquid for Oriented Piezoelectric Films
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Solution Overview
Problem
Conventional barium titanate-based dielectric thin films exhibit low film crystallinity and orientation, limiting their suitability for applications requiring high piezoelectric constants, such as inkjet recording heads, unless formed on a single crystal base.
Innovation Solution
A barium titanate-based coating liquid composition incorporating sol-gel source materials and a β-keto ester compound is used to create a highly oriented and crystalline perovskite-type barium titanate baked film, achieving (111) orientation on a metal electrode, which enhances piezoelectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sol-gel coating liquid is used to form barium titanate thin film, then the manufacturing process is simple and cost-effective, but the film crystallinity and orientation are low
Solution Approach 1:
The patent changes the chemical composition parameters of the coating liquid by incorporating specific organic compounds (β-diketon ligands and carboxylic acid additives) to modify the sol-gel process. This chemical parameter change enables the formation of highly crystalline and oriented barium titanate films without requiring complex manufacturing equipment or processes, thus improving film crystallinity while maintaining manufacturing simplicity
Solution Approach 2:
The patent creates a composite coating liquid system combining inorganic barium titanate precursors with organic compounds (β-diketon ligands and carboxylic acid additives). This composite approach allows the organic components to direct the crystallization process, enabling high film crystallinity and orientation to be achieved through chemical composition rather than complex physical processing
2Manufacturing precision
If conventional sol-gel coating liquid is used to form barium titanate thin film, then the manufacturing process is simple, but the film orientation is low unless formed on a single crystal base
Solution Approach 1:
The patent modifies the chemical parameters of the coating liquid by adding β-diketon ligands and carboxylic acid additives, which change the crystallization behavior of the barium titanate film. These parameter changes enable the film to achieve high orientation on conventional substrates without requiring single crystal bases or complex epitaxial growth processes, thus improving film orientation while maintaining ease of manufacture
Solution Approach 2:
The organic compounds (β-diketon ligands and carboxylic acid additives) act as intermediaries that mediate between the inorganic barium titanate precursors and the substrate. These intermediaries control the nucleation and growth of crystallites, directing them to form highly oriented structures on conventional substrates without requiring single crystal bases or complex manufacturing processes
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 results in a highly oriented and crystalline barium titanate film with improved piezoelectric characteristics, suitable for applications like inkjet recording heads, without the need for a single crystal base, thereby addressing the limitations of existing films.
Implementation Method 1
the sol-gel method allows the complex compositions of such thin films to be accurately controlled
Implementation Method 2
the sol-gel method allows the complex compositions of such thin films to be accurately controlled
Implementation Method 3
a coating film-forming step in which a coating liquid is applied to a substrate and then dried
Data Source
AI summary
Use of a barium titanate based coating liquid composition comprising:(a) a sol-gel source material containing(i) at least a barium component selected from a group consisting of barium alkoxides, hydrolyzates of barium alkoxides and condensates of hydrolyzates of barium alkoxides and (ii) at least a titanium component selected from a group consisting of titanium alkoxides, hydrolyzates of titanium alkoxides and condensates of hydrolyzates of titanium alkoxides; and(b) a β-keto ester compound expressed by general formula (1) shown below:where R1 and R2 independently represent respective alkyl groups having not less than 1 and not more than 6 carbon atoms.