Microwave Dielectric Properties for Ba(Mg_<1/3>Ta_<2/3>)O_3-A(Mg_<1/2>W_<1/2>)O_3(A=Ba, Sr, and Ca) Ceramics (<Special Issue> FERROELECTRIC MATERIALS AND THEIR APPLICATIONS)

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For a high-Q dielectric resonator at microwave frequencies, complex perovskite-structured Ba(Mg_<1/3>Ta_<2/3&g;)O_3-A(Mg_<1/2>W_<1/2>)O_3 (A=Ba, Sr, and Ca) ceramics have been developed. A(Mg_<1/2>W_<1/2>)O_3 effects on the crystal structure, microstructure, and microwave characteristic of Ba(Mg_<1/3>Ta_<2/3>)O_3 (BMT) were investigated. Ba(Mg_<1/2>W_<1/2>)O_3 (BMW) decreased the temperature coefficient of resonant frequency (TCF) for BMT. Sr(Mg_<1/2>W_<1/2>)O_3 (SMW) and Ca(Mg_<1/2>W_<1/2>)O_3 (CMW) increased it. Zero TCF was obtained for the BMT/BMW=95/5 composition. With 0.5 mol% BMW content, dielectric loss quality, Q_d, reached a maximum (40000 at 10 GHz).
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1994-09-30