| 摘要 |
PROBLEM TO BE SOLVED: To enable a dielectric porcelain composition to have an appropriate size of dielectric coefficient, a high no-load Q value and a small temperature coefficient of resonance frequency and permit the temperature coefficient of the resonance frequency to arbitrarily vary around the center value of 0 by having a structure represented by a specific formula. SOLUTION: As starting materials, chemically high-purity Sm2 O3 , TiO2 , SnO2 and Nb2 O5 powders are weighed so that the composition ratio satisfies the general formula: Sm(Ti1-x Snx )NbO6 (0<=x<=0.6) to use as the main raw materials. One hundred pts.wt. of the main components are combined with at least one selected from oxides of Cr, Mn, Fe, Co, Ni and Cu as the sub-components in amounts <=1.0 pts.wt. (except 0 pts.wt.) calculated as Cr2 O3 , MnO2 , Fe2 O3 , Co2 O3 , NiO and CuO, additionally cobblestone and pure water are mixed, then dehydrated and dried. Then, the product is charged in an alumina crucible and calcinated at about 1,100 deg.C. The calcinated powder and pure water are subjected to wet crushing, then dehydrated, dried, combined with an organic binder, sieved and graded, molded with a pressure of 1 torn/cm<2> , then fired in the air at 1,300-1,500 deg.C for 2-50 hours. |
