SrZrO3 Glass Ceramic for High Q Value and Low-Temperature Sintering
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Solution Overview
Problem
The existing glass ceramic compositions, such as those described in Japanese Unexamined Patent Application Publication No. 5-217426, have limitations in achieving high Q values, with a maximum Q value of about 5,000 GHz, and face challenges in maintaining dielectric constant stability and low-temperature sintering while ensuring good radio-frequency characteristics.
Innovation Solution
A glass ceramic composition comprising SrZrO3 ceramic and Li2O—MgO—ZnO—B2O3—SiO2-based glass, with specific weight percentage ranges, and optionally including SrTiO3, BaZrO3, Mg2SiO4, TiO2, and ZrO2, which allows for low-temperature sintering and enhances Q values without increasing the temperature coefficient of dielectric constant, enabling improved radio-frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a Li2O-RO-B2O3-SiO2-based glass is added to (Ca, Sr)(Zr, Ti)O3-MnO-SiO2 ceramic, then the Q value increases to about 5,000 GHz, but further improvement in Q value is limited
Solution Approach 1:
The patent changes the chemical composition parameters of the glass phase by introducing specific metal oxides (MgO: 20-50 wt%, ZnO: 5-20 wt%, B2O3: 16-29 wt%) in controlled ratios. This parameter optimization transforms the glass composition to achieve Q values exceeding 5,000 GHz while maintaining dielectric constant stability, directly resolving the limitation of the prior art.
Solution Approach 2:
The patent creates a composite material system combining SrZrO3 ceramic with a specifically formulated Li2O-MgO-ZnO-B2O3-SiO2 glass phase. This composite structure leverages the high dielectric constant of SrZrO3 and the low loss characteristics of the optimized glass, achieving synergistic improvement in Q value and dielectric stability that overcomes the prior art's performance ceiling.
2Temperature
If glass ceramic composition is fired at about 1,000°C or lower, then low-temperature sintering is achieved, but maintaining high Q value and dielectric constant stability becomes challenging
Solution Approach 1:
The patent modifies the glass composition parameters to include specific ratios of MgO (20-50 wt%), ZnO (5-20 wt%), and B2O3 (16-29 wt%), which lower the melting and sintering temperatures of the glass phase. This enables effective sintering at 1,000°C or lower while the SrZrO3 ceramic phase and optimized glass composition work together to maintain high Q values, resolving the contradiction between low-temperature processing and performance maintenance.
3Temperature
If glass ceramic composition is fired at about 1,000°C or lower, then low-temperature sintering is achieved, but dielectric constant stability with respect to temperature becomes difficult to maintain
Solution Approach 1:
The patent employs a composite material system where SrZrO3 ceramic provides dielectric constant stability and the Li2O-MgO-ZnO-B2O3-SiO2 glass phase enables low-temperature sintering. The synergistic interaction between these components allows the material to be sintered at 1,000°C or lower while maintaining stable dielectric constant characteristics across temperature ranges, simultaneously achieving both low-processing temperature and performance stability.
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 proposed glass ceramic composition achieves high Q values, stable dielectric constants, and reduced conductor resistance losses, resulting in enhanced radio-frequency performance and reliability of monolithic ceramic electronic components.
Implementation Method 1
The glass ceramic composition can be fired at a temperature of about 1,000° C. or lower. As a result of the firing, a glass ceramic sintered body having a high relative dielectric constant, a characteristic that the dielectric constant is stable with respect to temperature, and a high Q value can be obtained.
Data Source
AI summary
A glass ceramic composition includes a SrZrO3 ceramic, a Li2O—MgO—ZnO—B2O3—SiO2-based glass, Mg2SiO4 in an amount of about 5 to 40 weight percent, and a SrTiO3 ceramic in an amount in the range of about 0 to about 6 weight percent of the total. The Li2O—MgO—ZnO—B2O3—SiO2-based glass accounts for about 1 to about 12 weight percent of the total.