BaTiO3 BaZrO3 Dielectric Ceramic Lattice Volume Control

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Solution Overview

Problem

Conventional multilayer ceramic capacitors with perovskite-type dielectric ceramic compositions suffer from oxygen defects that degrade reliability when an electric field is applied, leading to unsatisfactory performance, especially in automotive applications.

Innovation Solution

A dielectric ceramic composition with a perovskite-type compound (ABO3) where A includes Ba and B includes Ti and Zr, with a sintered-body lattice volume of 64.50 Å3 or above, ensuring improved reliability by minimizing oxygen defect movement and substitution, thereby enhancing the structural integrity and performance of multilayer ceramic capacitors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional perovskite type dielectric ceramic composition is used, then the multilayer ceramic capacitor can be manufactured with standard processes, but oxygen defects are generated and move to negative electrode under electric field, degrading reliability

Engineering Contradiction:

ImprovereliabilityVSAvoidoxygen defect movement

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the lattice volume parameter of the perovskite type compound to 64.50 Å³ or more by adjusting the composition ratio between BaTiO3 and BaZrO3. This parameter change modifies the crystal structure to reduce oxygen defect generation and movement, thereby improving reliability without changing the fundamental manufacturing process

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite material system combining BaTiO3 and BaZrO3 in specific ratios. By creating a composite perovskite structure with controlled composition, the material achieves optimal lattice volume to prevent oxygen defect issues while maintaining dielectric performance

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If additives are added to obtain base material, then the base material can be manufactured, but the sintered-body lattice volume becomes less than 64.50 Å³, causing oxygen defects and reliability degradation

Engineering Contradiction:

Improvebase material manufacturingVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent identifies and controls the critical parameter of sintered-body lattice volume, setting it to 64.50 Å³ or more. By monitoring and adjusting this parameter through composition control, the patent ensures both manufacturability and reliability are achieved simultaneously

Inventive Principle:

Principle #35Parameter changes

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 dielectric ceramic composition with a sintered-body lattice volume of 64.50 Å3 or above significantly improves the reliability and high-temperature load life of multilayer ceramic capacitors, reducing failure rates and maintaining performance under electrical stress.

Implementation Method 1

a sintered-body lattice volume obtained by X-ray diffraction method is 64.50 Å3 or above

Methodology Applied

Scientific EffectLattice structure stability:

Data Source

PatentUS11031182B2Dielectric ceramic composition, electronic device, and multilayer ceramic capacitor

Publication Date: 2021.06.08 TDK CORP

AI summary

A dielectric ceramic composition includes a main component of a perovskite type compound represented by a general formula of ABO3, in which A is an element in an A-site, B is an element in a B-site, and O is an oxygen element. A includes Ba. B includes Ti and Zr. A sintered-body lattice volume obtained by X-ray diffraction method is 64.50 Å3 or above.