Meixi Biology stated that magnesium oxide significantly improves the performance of high-frequency electronic devices in LTCC electronic low-dielectric low-temperature co-fired ceramics through mechanisms such as dielectric control, low-temperature sintering assistance, and thermal expansion matching.
Magnesium oxide has a dielectric constant of approximately 9-10, and when compounded with other low-dielectric components, it can effectively lower the overall dielectric constant. Magnesium oxide also has a low dielectric loss, approximately 0.0001 to 0.001, which helps reduce the energy dissipation of high-frequency signals and enhances device efficiency.
Magnesium oxide can serve as a sintering aid by reacting with the glass phase to form a low-melting-point liquid phase. For example, by combining with borosilicate glass, it promotes densification between ceramic particles and lowers the sintering temperature. The addition of magnesium oxide can refine the grain size, preventing performance degradation caused by excessive grain growth at high temperatures, thereby achieving high densification at lower temperatures.
Magnesium oxide has a relatively high coefficient of thermal expansion (CTE), and by compounding it with other low-expansion components, the overall CTE can be adjusted to closely match that of silicon, enhancing the thermal reliability of the device. The inclusion of magnesium oxide can also increase the mechanical strength of LTCC electronic low-dielectric low-temperature co-fired ceramics, such as flexural strength, which enhances the device’s resistance to impact during packaging and use.
Magnesium oxide exhibits excellent chemical stability in high-temperature and humid environments, which improves the anti-aging properties of LTCC electronic low-dielectric low-temperature co-fired ceramics and extends device life.