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Ultralow-dielectric-constant microwave dielectric ceramic SmY2V3O12 having near-zero resonance frequency temperature coefficient
The invention discloses ultralow-dielectric-constant microwave dielectric ceramic SmY2V3O12 having a near-zero resonance frequency temperature coefficient and adopting a tetragonal zirconia structure as well as a preparation method of the microwave dielectric ceramic SmY2V3O12. The method comprises steps as follows: (1) original Sm2O3, Y2O3 and V2O5 powder with the purity higher than 99.9% (weight percentage) is weighed and prepared according to composition of the SmY2V3O12; (2) the raw material in Step (1) is subjected to wet ball milling and mixing for 12 h, distilled water serves as a ball milling medium, and pre-sintering is performed in the atmosphere at the temperature of 800 DEG C for 6 h after drying; (3) a binder is added to powder obtained in Step (2), granulation and compression molding are performed, and finally, sintering is performed in the atmosphere at the temperature of 850-900 DEG C for 4 h, wherein a polyvinyl alcohol solution with the mass concentration of 5% serves as the binder and the adding amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared ceramic is well sintered at the temperature lower than 900 DEG C, the dielectric constant is 10.7-11.4, the Qf (quality factor) value is up to 145000-193000 GHz, the resonance frequency temperature coefficient is low, and the ceramic has the great industrial application value.
Ultralow-dielectric-constant microwave dielectric ceramic SmY2V3O12 having near-zero resonance frequency temperature coefficient
The invention discloses ultralow-dielectric-constant microwave dielectric ceramic SmY2V3O12 having a near-zero resonance frequency temperature coefficient and adopting a tetragonal zirconia structure as well as a preparation method of the microwave dielectric ceramic SmY2V3O12. The method comprises steps as follows: (1) original Sm2O3, Y2O3 and V2O5 powder with the purity higher than 99.9% (weight percentage) is weighed and prepared according to composition of the SmY2V3O12; (2) the raw material in Step (1) is subjected to wet ball milling and mixing for 12 h, distilled water serves as a ball milling medium, and pre-sintering is performed in the atmosphere at the temperature of 800 DEG C for 6 h after drying; (3) a binder is added to powder obtained in Step (2), granulation and compression molding are performed, and finally, sintering is performed in the atmosphere at the temperature of 850-900 DEG C for 4 h, wherein a polyvinyl alcohol solution with the mass concentration of 5% serves as the binder and the adding amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The prepared ceramic is well sintered at the temperature lower than 900 DEG C, the dielectric constant is 10.7-11.4, the Qf (quality factor) value is up to 145000-193000 GHz, the resonance frequency temperature coefficient is low, and the ceramic has the great industrial application value.
Ultralow-dielectric-constant microwave dielectric ceramic SmY2V3O12 having near-zero resonance frequency temperature coefficient
FANG LIANG (Autor:in) / TANG YING (Autor:in) / FANG WEISHUANG (Autor:in)
25.11.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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