BaZrTiO3 Dielectric Ceramics Using Triphase TiO2 Core-Shell Powder
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Solution Overview
Problem
Existing BaTiO3-based dielectric materials struggle to achieve a colossal dielectric constant of 104 or higher while maintaining a low dielectric loss, making them unsuitable for high-performance electronic devices and energy storage applications.
Innovation Solution
A manufacturing method involving the preparation of BaZrTiO3 dielectric ceramics using a triphase core/shell structured TiO2 powder, achieved by heat-treating anatase-phase TiO2 powder to induce a composite-phase structure of anatase/brookite/rutile phases, followed by mixing with BaCO3 and ZrO2 powders and sintering to form a solid solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ultra-high dielectric constant dielectrics (εr≥10^4) are used to meet high-performance electronic device requirements, then the dielectric constant is improved, but the dielectric loss increases to approximately 10^-2 or higher, making them difficult to apply practically
Solution Approach 1:
The patent uses composite-phase TiO2 powder containing anatase, brookite, and rutile phases as a starting material to synthesize BaZrTiO3 ceramics. This composite material approach leverages the synergistic effects of multiple TiO2 phases to achieve both ultra-high dielectric constant (≥10^4) and low dielectric loss (≤10^-3), resolving the contradiction between high dielectric constant and low dielectric loss that plagues conventional single-phase materials
Solution Approach 2:
The patent systematically varies the heat treatment temperature (600-900°C) and holding time (5-9 hours) to control the phase composition and microstructure of TiO2 powder. By optimizing these parameters, the resulting BaZrTiO3 ceramics achieve the desired balance of ultra-high dielectric constant and low dielectric loss, demonstrating how parameter optimization can resolve the performance contradiction
2Quantity of substance
If Zr is added to BaTiO3 and Ti is substituted at the B site to induce lattice expansion and structure change, then the dielectric constant increases to approximately 2×10^4, but the dielectric loss remains high at approximately 10^-2
Solution Approach 1:
The patent combines Zr-substituted BaTiO3 with composite-phase TiO2 (anatase/brookite/rutile) to create a new material system. The composite-phase TiO2 acts as a nucleating agent and structural template that, when combined with Zr substitution, enables simultaneous achievement of ultra-high dielectric constant and low dielectric loss, overcoming the limitation of previous Zr-substituted materials
3Quantity of substance
If barium titanate (BaTiO3) ferroelectric powder is used to manufacture MLCCs, then the dielectric constant is high at approximately 1,700, but it cannot meet the requirement for colossal dielectric constant (≥10^4) needed for ultra-high-speed signal processing and high voltage energy storage
Solution Approach 1:
The patent changes the chemical composition from conventional BaTiO3 to BaZrTiO3 solid solution, and further optimizes the TiO2 phase composition (anatase/brookite/rutile ratios) through controlled heat treatment. These compositional and structural changes enable the material to achieve colossal dielectric constant (≥10^4), expanding its applicability to ultra-high-speed signal processing and high voltage energy storage devices
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 method results in BaZrTiO3 ceramics with an ultra-high dielectric constant of up to 33,560 and a very low dielectric loss of about 1×10−3, suitable for high-performance electronic devices and energy storage devices.
Implementation Method 1
heat-treating the anatase single-phase TiO2 powder to induce a phase transition, so that the internal structure of a particle of the composite-phase TiO2 powder is composed of a core/shell structure in which an anatase-phase TiO2 region/a brookite-phase TiO2 region/a rutile-phase TiO2 region are laminated
Implementation Method 2
mixing the BaCO3 raw material powder, the composite-phase TiO2 powder, and the ZrO2 raw material powder, and heat-treatment calcining the mixed powder to synthesize BaZrTiO3 powder
Implementation Method 3
molding the synthesized BaZrTiO3 powder and sintering the molded body to form a BaZrTiO3 solid solution
Data Source
AI summary
A method for manufacturing BaZrTiO3 dielectric ceramics according to the present invention is disclosed. The method comprises (i) preparing BaCO3 raw material powder, TiO2 raw material powder, and ZrO2 raw material powder, respectively, wherein the TiO2 raw material powder is prepared as an anatase single-phase TiO2 powder; (ii) producing a composite-phase TiO2 powder by heat-treating the anatase single-phase TiO2 powder to induce a phase transition, so that the internal structure of a particle of the composite-phase TiO2 powder is composed of a core/shell structure in which an anatase-phase TiO2 region/a brookite-phase TiO2 region/a rutile-phase TiO2 region are laminated, wherein the brookite-phase TiO2 region is a hybrid region in which the anatase-phase TiO2 region and the rutile-phase TiO2 region are coexisting; (iii) mixing the BaCO3 raw material powder, the composite-phase TiO2 powder, and the ZrO2 raw material powder, and heat-treatment calcining the mixed powder to synthesize BaZrTiO3 powder; and (iv) molding the synthesized BaZrTiO3 powder and sintering the molded body to form a BaZrTiO3 solid solution.