| 摘要 |
A glass-free microwave dielectric ceramic that can be sintered at low temperature, and a manufacturing method thereof are provided. The glass-free microwave dielectric ceramic composition includes a composition represented by a formula, M2+N4+B2O6, wherein M is one element of Ba, Ca and Sr, and N is one element of Sn, Zr and Ti. The M may be replaced by two elements of Ba, Ca and Sr different from each other, to form a composition represented by a formula, (M1-x2+Mx2+)N4+B2O6, wherein 0<x<1. The N may also be replaced by two elements of Sn, Zr and Ti different from each other, to form a composition represented by a formula, M2+(N1-y4+Ny4+)B2O6, wherein 0<y<1. Furthermore, it is also possible to replace both of the M and N to form a composition represented by a formula, (M1-x2+Mx2+)(N1-y4+Ny4+)B2O6, wherein 0<x<1 and 0<y<1. In addition, the glass-free microwave dielectric ceramic composition may further includes 1 wt % to 7 wt % of a sintering agent represented by a formula, &bgr;CuO+γBi2O3, wherein 0.55<&bgr;<0.96 and 0.40<γ≦̸0.45. As such, the glass-free microwave dielectric ceramic composition may be sintered at a low temperature at lowest 875° C.
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