Mg-Ta Dielectric Ceramic Composition for Low-Temperature RF MLCC Sintering
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Solution Overview
Problem
MgTa2O6-based ceramics face challenges in maintaining excellent dielectric properties at lower sintering temperatures, which is necessary for RF MLCCs with M2G temperature characteristics, due to high sintering temperatures and increased dielectric loss when attempting to reduce these temperatures.
Innovation Solution
A Mg-Ta based dielectric ceramic with a modifier (A+12CO3—B2+O—C3+2O3—SiO2) is used, where A=Li2CO3 and K2CO3, B=BaO, MnO, CuO, and C=B2O3, Al2O3, with a mass ratio of 31:17:36:16, added in a range of 1-2 wt.%, prepared via a solid-state method at 1050-1150°C, maintaining a Trirutile structure and achieving stable dielectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the sintering temperature of MgTa2O6-based ceramic is reduced, then the energy consumption and manufacturing cost are decreased, but the dielectric loss increases and dielectric properties deteriorate
Solution Approach 1:
The patent applies parameter changes by systematically varying the composition ratios of multiple modifiers (B2O3, Al2O3, SiO2, Li2CO3, K2CO3, BaO, MnO, CuO) to optimize the sintering temperature and dielectric properties. By adjusting the specific proportions of these modifiers, the invention achieves a balance between lowering sintering temperature and maintaining low dielectric loss, resolving the contradiction between energy efficiency and material performance.
Solution Approach 2:
The patent employs composite materials by creating a multi-component modifier system combined with MgTa2O6 base ceramic. The composite modifier composition (containing B2O3, Al2O3, SiO2, Li2CO3, K2CO3, BaO, MnO, CuO in specific ratios) works synergistically to lower the sintering temperature while maintaining excellent dielectric properties, effectively resolving the contradiction between reduced processing temperature and preserved material performance.
2Ease of manufacture
If the sintering temperature of MgTa2O6-based ceramic is reduced, then the manufacturing process becomes more accessible and equipment requirements are lowered, but the dielectric constant stability and temperature coefficient control are compromised
Solution Approach 1:
The patent utilizes parameter changes by precisely controlling the composition ratios of eight different modifiers to achieve optimal sintering behavior. This systematic parameter optimization enables low-temperature sintering while maintaining stable dielectric constant and temperature coefficient, making the manufacturing process more accessible without compromising material stability.
Solution Approach 2:
The multi-component modifier system acts as an intermediary that facilitates low-temperature sintering while preserving dielectric stability. These modifiers mediate between the base MgTa2O6 ceramic and the sintering process, enabling accessible manufacturing conditions while maintaining composition stability and desired electrical properties.
3Device complexity
If traditional single-modifier approaches are used to lower sintering temperature, then the process simplification is achieved, but the dielectric loss and temperature coefficient control are insufficient
Solution Approach 1:
The patent employs a composite modifier system containing eight different oxides and carbonates in specific proportions. This composite approach provides superior dielectric property reliability compared to single-modifier systems, as the synergistic interaction among multiple components enables precise control of dielectric loss and temperature coefficient while maintaining compositional stability.
Solution Approach 2:
The patent applies local quality by assigning specific functional roles to different modifiers within the composite system. Each component (B2O3, Al2O3, SiO2, Li2CO3, K2CO3, BaO, MnO, CuO) contributes specific properties that collectively enhance dielectric reliability, allowing the system to achieve reliable performance through distributed functional specialization rather than uniform composition.
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 achieves a reduced sintering temperature while maintaining excellent dielectric properties, with a dielectric constant of 20-28, dielectric loss of 1.7×10−4 to 5.0×10−4, and a quality factor Q×f of 16000-45000 GHz, meeting the M2G temperature characteristics and being suitable for industrial application.
Implementation Method 1
a sintering temperature of the Mg—Ta based dielectric ceramic is in a range of 1050° C. to 1150° C.
Implementation Method 2
a dielectric constant of the Mg—Ta based dielectric ceramic is in a range of 20 to 28
Data Source
AI summary
A Mg—Ta based dielectric ceramic for multi-layer ceramic capacitor (MLCC) and a low-temperature preparation method thereof are provided. By providing a glass additive with high matching with a Mg—Ta ceramic, a modifier A+12CO3—B2+O—C3+2O3—SiO2 (A=Li, K; B=MnO, CuO, BaO; C=B, Al) is intruded in to a main material MgO—Ta2O5, which can significantly reduce the sintering temperature and provide a negative temperature coefficient of dielectric constant of −100±30 ppm/° C., and reduce the deterioration factors of loss caused by an additive for sintering, and prepare a dielectric material applied to RF MLCC with low loss, low cost and good process stability.