Effects of CaO additives on the structure and properties of Ba6−3xSm8+2xTi18O54 (x = 0.5) ceramics

The tungstenbronze-type-like Single-phase polycrystalline ceramics Ba_6−3xSm_8+2xTi₁₈O₅₄ (x = 0.5) doping with Ca ions had been prepared through the conventional solid-state reaction process. The phases and structure of the ceramics were analyzed through X-ray diffraction and scanning electron microscopy. The microwave dielectric properties of the ceramics were studied using a network analyzer. In this paper, the quality factor (Q × f) by substituting Ca ions for Ba ions in (Ba_1−αCa_α) Sm₂Ti₄O₁₂ solid solutions in A1-sites was reported. In addition, the relationship between crystal structure and microwave dielectric properties was discussed from the viewpoint of structural formula and occupational state of large cations such as Ba, Ca ions in A1-sites.