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Microwave dielectric ceramic Li3MgBi5O10 with ultralow dielectric constant and preparation method thereof
The invention discloses a high-quality and stable microwave dielectric ceramic Li3MgBi5O10 with an ultralow dielectric constant and a preparation method thereof, wherein the dielectric ceramic can be sintered at a low temperature. The preparation method comprises the following steps: (1) weighing the following powder with purity (weight percentage) of 99.9% or more: Li2O3, MgO, and Bi2O3 according to the composition of Li3MgBi5O10; (2) subjecting the raw materials prepared in the step (1) to 12 hours of wet ball milling to mix the powder, wherein distilled water is taken as the medium of ball milling, drying the mixture, and then pre-burning the mixture at a temperature of 700 DEG C in atmosphere for 6 hours; (3) adding an adhesive into the powder obtained in the step (2), carrying out granulation, pressing, moulding, and finally sintering the granules at a temperature of 750 to 800 DEG C in atmosphere for 4 hours; wherein the adhesive is a polyvinyl alcohol solution with a mass concentration of 5%, and the added polyvinyl alcohol accounts for 3% of the total weight of the powder. The prepared ceramic can be well sintered at a temperature of 800 DEG C, the dielectric constant can reach 11.7 to 12.6, the quality factor (Qf) value can reach 71000 to 93000 GHz, the temperature coefficient of resonance frequency is small, and thus the provided microwave dielectric ceramic has a great application value in industry.
Microwave dielectric ceramic Li3MgBi5O10 with ultralow dielectric constant and preparation method thereof
The invention discloses a high-quality and stable microwave dielectric ceramic Li3MgBi5O10 with an ultralow dielectric constant and a preparation method thereof, wherein the dielectric ceramic can be sintered at a low temperature. The preparation method comprises the following steps: (1) weighing the following powder with purity (weight percentage) of 99.9% or more: Li2O3, MgO, and Bi2O3 according to the composition of Li3MgBi5O10; (2) subjecting the raw materials prepared in the step (1) to 12 hours of wet ball milling to mix the powder, wherein distilled water is taken as the medium of ball milling, drying the mixture, and then pre-burning the mixture at a temperature of 700 DEG C in atmosphere for 6 hours; (3) adding an adhesive into the powder obtained in the step (2), carrying out granulation, pressing, moulding, and finally sintering the granules at a temperature of 750 to 800 DEG C in atmosphere for 4 hours; wherein the adhesive is a polyvinyl alcohol solution with a mass concentration of 5%, and the added polyvinyl alcohol accounts for 3% of the total weight of the powder. The prepared ceramic can be well sintered at a temperature of 800 DEG C, the dielectric constant can reach 11.7 to 12.6, the quality factor (Qf) value can reach 71000 to 93000 GHz, the temperature coefficient of resonance frequency is small, and thus the provided microwave dielectric ceramic has a great application value in industry.
Microwave dielectric ceramic Li3MgBi5O10 with ultralow dielectric constant and preparation method thereof
LI CHUNCHUN (author) / WANG DAN (author) / SU HEPING (author)
2016-01-13
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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