Abstract
The phase structure, ions valence state and microwave dielectric properties of Ba4(Ce x Sm1−x )9.3Ti18O54 (0 ≤ x ≤ 0.9, BCST) ceramics sintered in air and nitrogen have been investigated. BCST (x ≤ 0.1) ceramics sintered in air only exhibited peaks associated with tungsten bronze phase structure. A secondary CeO2 phase appeared for x = 0.5, while CeO2 and Ba2Ti9O20 phases coexisted for the ceramics with x = 0.9. In contrast, ceramics fired in nitrogen exhibited tungsten bronze phase structure for all compositions from x = 0 to 0.9 within the solid solution. The chemical structure analysis exhibited that, all the sample possessed mixed ion valance states of Ce4+/Ce3+ and Ti4+/Ti3+ cations upon oxygen vacancy formations. It is found that incorporation of cerium could significant improve the Q × f values of BCST ceramics sintered in nitrogen with good microwave dielectric properties (Q × f ∼7536 GHz, e r ∼78, and τ f ∼24.61 ppm/°C) at x = 0.5.
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