Effect of perovskite impurity addition on microwave dielectric properties of Ba(Mg/sub 1/3/Ta/sub 2/3/)O/sub 3/-Ba(Ni/sub 1/3/Ta/sub 2/3/)O/sub 3/ ceramics

Microwave dielectric properties in the system Ba(Mg/sub 1-x/3/Ni/sub x/3/Ta/sub 2/3/)O/sub 3/-yBaZrO/sub 3/ or Ba(Mg/sub 1-x/3/Ni/sub x/3/Ta/sub 2/3/)O/sub 3/-zBaSnO/sub 3/ were investigated with an emphasis on the sintering behavior, phase relations and microstructure-property relationships. The increase of Q value of 13000 at 6 GHz while achieving zero /spl tau//sub f/ occurred when y=0.05. The addition of excess MgO had a detrimental effect on Q value improvement, which is attributable to the segregation of excess MgO along grain boundaries. The appearance of Ba/sub 1/2/TaO/sub 3/ second phase would have negative effect on the improvement of and value. Therefore, the fabrication of ceramics without any second phase should be crucial in obtaining improved microwave performance.