Ceramic Dielectric Nanosheet Composite Structure
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Solution Overview
Problem
Current ceramic electronic components, such as multilayer ceramic capacitors, face challenges in achieving both high permittivity and resistivity simultaneously, which are essential for improved performance and reduced size in electronic devices.
Innovation Solution
A ceramic dielectric is developed comprising a bulk dielectric with barium and titanium, combined with a ceramic nanosheet of specific phases, such as Aurivilius or Ruddlesden-Popper phases, and a composite dielectric structure that includes semiconductive grains and insulating grain boundaries, enhancing permittivity and resistivity through a manufacturing process involving heat-treatment and exfoliation of layered ceramic powders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional bulk dielectric materials are used, then the component size can be reduced, but the permittivity is insufficient to achieve the required performance
Solution Approach 1:
The patent uses a composite dielectric structure combining bulk dielectric material with ceramic nanosheets (such as Aurivilius phase, Ruddlesden-Popper phase, or Dion-Jacobson phase materials). This composite approach achieves high permittivity (≥9000) while maintaining compact component dimensions, resolving the contradiction between achieving high permittivity and minimizing component size.
Solution Approach 2:
The patent introduces ceramic nanosheets with specific crystal phases at the grain boundaries of the bulk dielectric material. These nanosheets have distinct local properties (high permittivity and insulating characteristics) that enhance the overall dielectric performance without requiring the entire component to be enlarged, thus achieving high permittivity in a compact form.
2Temperature
If high permittivity materials are used to reduce component size, then the resistivity decreases leading to increased energy loss
Solution Approach 1:
The patent applies ceramic nanosheets specifically at the grain boundaries between semiconductive grains, creating localized insulating regions. This local application of high-resistivity material at critical interfaces prevents energy loss through grain boundaries while maintaining the high permittivity of the bulk semiconductive grains, thus achieving both high permittivity and high resistivity simultaneously.
Solution Approach 2:
The composite dielectric structure combines semiconductive bulk grains (providing high permittivity) with insulating ceramic nanosheet grain boundaries (providing high resistivity). This composite approach at the microstructural level resolves the contradiction between achieving high permittivity and maintaining high resistivity to minimize energy loss.
3Quantity of substance
If the component is miniaturized for reduced device size, then the manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates ceramic nanosheets into the bulk dielectric material during the sintering process itself, rather than as a separate post-processing step. The nanosheets are mixed with the bulk dielectric powder before sintering, allowing them to automatically position at grain boundaries during the sintering process. This preliminary incorporation simplifies the manufacturing process and reduces precision requirements compared to attempting to precisely place insulating layers after component fabrication.
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 ceramic dielectric achieves permittivity twice that of the bulk dielectric and resistivity exceeding 1×10^9 Ω·cm, simultaneously meeting high permittivity and resistivity requirements, suitable for advanced electronic components like multilayer ceramic capacitors.
Implementation Method 1
exfoliating a layered ceramic powder to prepare a ceramic nanosheet
Implementation Method 2
heat-treating a metal precursor including a barium precursor and a titanium precursor to obtain a bulk dielectric
Implementation Method 3
The ceramic dielectric may have a higher permittivity and resistivity than the bulk dielectric. The permittivity of the ceramic dielectric may be twice or more as high as the permittivity of the bulk dielectric.
Data Source
AI summary
A ceramic dielectric including: a bulk dielectric including barium (Ba) and titanium (Ti); a ceramic nanosheet; and a composite dielectric of the bulk dielectric and the ceramic nanosheet.