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Microwave dielectric ceramic LaYV2O8 with low loss, high thermal stability and ultralow dielectric constant
The invention discloses a microwave dielectric ceramic LaYV2O8 capable of realizing low temperature sintering and having low loss, high thermal stability and ultralow dielectric constant and a preparation method of the microwave dielectric ceramic LaYV2O8. The preparation method comprises steps as follows: (1), original powder of La2O3, Y2O3 and V2O5 with the purity higher than 99.9% in percentage by weight is weighed and proportioned according to composition of LaYV2O8; (2), the raw materials of the step (1) are subjected to wet ball-mill mixing for 12 h, a ball-mill medium adopts distilled water, and the raw materials after drying is presintered for 6 h in the air atmosphere at the temperature of 800 DEG C; (3), the powder prepared in the step (2) is pressed for forming after added with a binding agent and pelletized, and is sintered for 4 h in the air atmosphere at the temperature of 850-900 DEG C finally; the binding agent adopts a polyvinyl alcohol solution with the mass concentration of 5%, and the adding quantity of polyvinyl alcohol accounts for 3% of total mass of the powder. The prepared ceramic is sintered well at the temperature lower than 900 DEG C, the dielectric constant reaches 13.3-13.8, the Qf (quality factor) value of the microwave dielectric ceramic LaYV2O8 is up to 145,000-189,000 GHz, the temperature coefficient of resonance frequency is low, and the microwave dielectric ceramic LaYV2O8 has great industrial application value.
Microwave dielectric ceramic LaYV2O8 with low loss, high thermal stability and ultralow dielectric constant
The invention discloses a microwave dielectric ceramic LaYV2O8 capable of realizing low temperature sintering and having low loss, high thermal stability and ultralow dielectric constant and a preparation method of the microwave dielectric ceramic LaYV2O8. The preparation method comprises steps as follows: (1), original powder of La2O3, Y2O3 and V2O5 with the purity higher than 99.9% in percentage by weight is weighed and proportioned according to composition of LaYV2O8; (2), the raw materials of the step (1) are subjected to wet ball-mill mixing for 12 h, a ball-mill medium adopts distilled water, and the raw materials after drying is presintered for 6 h in the air atmosphere at the temperature of 800 DEG C; (3), the powder prepared in the step (2) is pressed for forming after added with a binding agent and pelletized, and is sintered for 4 h in the air atmosphere at the temperature of 850-900 DEG C finally; the binding agent adopts a polyvinyl alcohol solution with the mass concentration of 5%, and the adding quantity of polyvinyl alcohol accounts for 3% of total mass of the powder. The prepared ceramic is sintered well at the temperature lower than 900 DEG C, the dielectric constant reaches 13.3-13.8, the Qf (quality factor) value of the microwave dielectric ceramic LaYV2O8 is up to 145,000-189,000 GHz, the temperature coefficient of resonance frequency is low, and the microwave dielectric ceramic LaYV2O8 has great industrial application value.
Microwave dielectric ceramic LaYV2O8 with low loss, high thermal stability and ultralow dielectric constant
WANG DAN (author) / LI CHUNCHUN (author) / TANG YING (author)
2015-11-25
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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