Ultra-low dielectric constant microwave dielectric ceramic EuY2V3O12 with low loss and high thermal stability

The invention discloses a tetragonal-zirconia-structured ultra-low dielectric constant microwave dielectric ceramic EuY2V3O12 with low loss and high thermal stability and a preparation method thereof. The preparation method comprises the steps of (1) weighing and batching original powder with the purity being above 99.9 percent (weight percentage) of Eu2O3, Y2O3 and V2O5 according to the constitute of EuY2V3O12; (2) performing wetted ball grinding and mixing on the material of the step (1) for 12 hours, wherein a ball milling medium is distilled water, and pre-sintering at an 800 DEG C of air atmosphere for 6 hours after drying; (3) adding a binding agent into the powder prepared in the step (2) and pelleting, then performing compression moulding, and finally sintering for 4 hours at an 850 to 900 DEG C of air atmosphere; the binding agent adopts a polyvinyl alcohol solution with the mass concentration being 5 percent, and the additive amount of polyvinyl alcohol accounts for 3 percent of the total mass of the powder. The ceramic prepared by the preparation method is well sintered at the temperature below 900 DEG C, the dielectric constant reaches 10.3 to 10.7, the quality factor Qf value of the ceramic reaches up to 156000 to 188000GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great application value in industry.