Preparation method for microwave dielectric resonator with laminated structure

A preparation method for a microwave dielectric resonator with a laminated structure, wherein a composition expression of the microwave dielectric resonator is as follows:

• y·ZnTi0.95Sc0.05Nb2O8-x·TiO2-y·ZnTi0.95Sc0.05Nb2O8,
• where a range of x is 0.03-0.05 grams (g), y is (1−x)/2 g;
• and
• wherein the preparation method comprises:
• step 1:
• weighing materials consisting of zinc peroxide (ZnO2), titanium dioxide (TiO2), scandium oxide (Sc2O3) and niobium oxide (Nb2O8) according to a chemical equation expressed as follows:
• ZnTi0.95Sc0.05Nb2O8,
• then mixing the materials to obtain a mixture, followed by sequentially ball-milling, drying, crushing, sieving, and then performing first pre-sintering to obtain preliminarily synthesized ZnTi0.95Sc0.05Nb2O8 dielectric ceramic powder with a mangan-tantalite structure,
• wherein a temperature of the first pre-sintering is in a range of 900-950° C., a time of the first pre-sintering is in a range of 4-6 hours (h);
• step 2:
• weighing TiO2, followed by sequentially ball-milling, drying, crushing, sieving, and then performing second pre-sintering to obtain preliminarily synthesized TiO2 dielectric ceramic powder with a rutile structure, wherein a temperature of the second pre-sintering is in a range of 900-950° C., a time of the second pre-sintering is in a range of 4-6 h;
• step 3:
• adding polyvinyl alcohol into the preliminarily synthesized ZnTi0.95Sc0.05Nb2O8 dielectric ceramic powder with the mangan-tantalite structure obtained from the step 1, followed by sequentially ball-milling, drying, crushing, and sieving to thereby obtain granulated ZnTi0.95Sc0.05Nb2O8 dielectric ceramic powder;
• and adding polyvinyl alcohol into the preliminarily synthesized TiO2 dielectric ceramic powder with the rutile structure obtained from the step 2, followed by sequentially ball-milling, drying, crushing, and sieving to thereby obtain granulated TiO2 dielectric ceramic powder;
• step 4:
• adding the granulated ZnTi0.95Sc0.05Nb2O8 dielectric ceramic powder and the granulated TiO2 dielectric ceramic powder into a mold, to thereby obtain a ceramic green body with a three-layer structure, wherein a bottom layer of the three-layer structure is filled with the granulated ZnTi0.95Sc0.05Nb2O8 dielectric ceramic powder, a middle layer of the three-layer structure is filled with the granulated TiO2 dielectric ceramic powder, and a top layer of the three-layer structure is filled with the granulated ZnTi0.95Sc0.05Nb2O8 dielectric ceramic powder;
• and
• step 5:
• sintering the ceramic green body with the three-layer structure obtained from step 4 at a temperature in a range of 1100-1140° C. for 4-8 h to obtain the microwave dielectric resonator with the laminated structure.