Multilayer Ceramic Capacitor Design for Higher Capacitance
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Summary
Problems
Existing multilayer ceramic capacitors face limitations in reducing size and increasing capacitance despite efforts to control dielectric constant through composition and crystal grain diameter in dielectric ceramic layers.
Innovation solutions
The dielectric ceramic layers in multilayer ceramic capacitors are composed of perovskite oxide with a high percentage of {100} grains, oriented in a specific crystallographic plane, enhancing the dielectric constant and enabling a further reduction in size and increase in capacitance.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the dielectric ceramic layers are formed as thin layers to reduce capacitor size, then the capacitance density increases, but the manufacturing precision and reliability become more difficult to maintain
Why choose this principle:
The patent changes the crystallographic orientation parameter of the dielectric ceramic from random or conventional orientations to specifically oriented {100} grains. This parameter change enables the use of thinner dielectric layers while maintaining or improving dielectric constant, thus achieving reduced capacitor size without sacrificing manufacturing precision or reliability.
Principle concept:
If the dielectric ceramic layers are formed as thin layers to reduce capacitor size, then the capacitance density increases, but the manufacturing precision and reliability become more difficult to maintain
Why choose this principle:
The patent employs a composite microstructure within the dielectric ceramic layers, combining {100} oriented grains with specific grain size distributions and phase compositions. This composite approach allows thin dielectric layers to achieve high dielectric constants while maintaining manufacturing feasibility and device reliability.
Application Domain
Data Source
AI summary:
The dielectric ceramic layers in multilayer ceramic capacitors are composed of perovskite oxide with a high percentage of {100} grains, oriented in a specific crystallographic plane, enhancing the dielectric constant and enabling a further reduction in size and increase in capacitance.
Abstract
A multilayer ceramic capacitor includes a body including dielectric ceramic layers and inner electrode layers. The dielectric ceramic layers include crystal grains including a perovskite oxide including at least one A-site element and at least one B-site element. When a cross-section of the dielectric ceramic layers is observed using a scanning transmission electron microscope, the dielectric ceramic layers include grains, on which a plane of a perovskite structure is observed, as crystal grains. In the cross-section, a percentage by number of the grains in the crystal grains is about 4% or more.