文摘
Srn+1TinO3n+1 (n=1, 2) ceramics with tetragonal Ruddlesden–Popper structure were prepared via a standard solid-state reaction process, and their microstructures and microwave dielectric properties were investigated systematically. The phase composition, grain morphology, and densification behavior were explored using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Outstanding microwave dielectric properties were achieved in the present ceramics: εr=42, Q × f=145 200 GHz, τf=130 ppm/°C for Sr2TiO4, and εr=63, Q × f=84 000 GHz, τf=293 ppm/°C for Sr3Ti2O7, respectively. The present ceramics might be expected as excellent candidates for next-generation medium-permittivity microwave dielectric ceramics after the further optimization of τf value.