| Summary: | 碩士 === 國立臺北科技大學 === 資源工程研究所 === 96 === For the widespread commercialization of satellite communications today and in view of its future advancement, cell phone must become miniaturized and light weight, so the development of low temperature co-fired ceramic of high dielectric constant has become more important.
Barium titanate, BaTiO3 has many kinds of crystal structures; few researchers to date have focused on a high-temperature hexagonal polymorph (h-BaTiO3).In this study, traditional solid-state reaction method was used to incorporate Mn dopant (x=0.15) to stabilize hexagonal BaTiO3 and then mix different aids to reduce the sintering temperature and still retain the best microwave dielectric properties. So, the microstructures and properties of the Ba(Ti1-xMnx)O3 samples are analyzed by measuring dielectric parameters, XRD and SEM .
The results show that Bi2O3, B2O3, Li2CO3 and (5ZnO•2B2O3) can effectively reduce the sintering temperature and keep the main phase as hexagonal. Good microwave dielectric properties of εr = 54.4, Q • f =3448 GHz and τf =254.5 ppm/℃can be obtained for 10wt% B2O3 doped Ba(Ti0.85Mn0.15)O3 ceramics sintered at 1100℃ for 2h.
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