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Temperature-stable medium-dielectric constant microwave dielectric ceramic Li2SmNbO5
The invention discloses a temperature-stable medium-dielectric constant microwave dielectric ceramic Li2SmNbO5 which can be sintered at a low temperature, and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and mixing raw powder of Li2CO3, Sm2O3 and Nb2O5 with purity of more than 99.9% (weight percentage) according to the composition of Li2SmNbO5; (2) subjecting the raw materials in the step (1) to wet ball milling and mixing for 12 h, wherein a ball milling medium is distilled water, drying the obtained mixture and then pre-sintering the mixture in atmosphere at 800 DEG C for 6 h; and (3) adding a binder into powder prepared in the step (2), carrying out granulation, then carrying out compression molding and finally carrying out sintering in atmosphere at 850 to 900 DEG C for 4 h, wherein the binder is a polyvinyl alcohol solution with a mass concentration of 5%, and the addition amount of polyvinyl alcohol is 3% of the total mass of the powder. The microwave dielectric ceramic prepared in the invention is perfectly sintered at a temperature below 950 DEG C, and has a dielectric constant of 38.3 to 39.2, a quality factor (Qf) value of as high as 79000 to 91000 GHz, a small temperature coefficient of resonant frequency and a great industrial application value.
Temperature-stable medium-dielectric constant microwave dielectric ceramic Li2SmNbO5
The invention discloses a temperature-stable medium-dielectric constant microwave dielectric ceramic Li2SmNbO5 which can be sintered at a low temperature, and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and mixing raw powder of Li2CO3, Sm2O3 and Nb2O5 with purity of more than 99.9% (weight percentage) according to the composition of Li2SmNbO5; (2) subjecting the raw materials in the step (1) to wet ball milling and mixing for 12 h, wherein a ball milling medium is distilled water, drying the obtained mixture and then pre-sintering the mixture in atmosphere at 800 DEG C for 6 h; and (3) adding a binder into powder prepared in the step (2), carrying out granulation, then carrying out compression molding and finally carrying out sintering in atmosphere at 850 to 900 DEG C for 4 h, wherein the binder is a polyvinyl alcohol solution with a mass concentration of 5%, and the addition amount of polyvinyl alcohol is 3% of the total mass of the powder. The microwave dielectric ceramic prepared in the invention is perfectly sintered at a temperature below 950 DEG C, and has a dielectric constant of 38.3 to 39.2, a quality factor (Qf) value of as high as 79000 to 91000 GHz, a small temperature coefficient of resonant frequency and a great industrial application value.
Temperature-stable medium-dielectric constant microwave dielectric ceramic Li2SmNbO5
CHEN JINWU (author) / FANG LIANG (author) / WANG DAN (author)
2015-08-19
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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