Structural Evolution and Microwave Dielectric Properties of Ba 1- x Sr x Ti 4 O 9 , (0.0 ≤ x ≤ 0.06) Ceramics.

The structural, microstructural, and microwave dielectric properties of Ba 1- x Sr x Ti 4 O 9 , (0.0 ≤ x ≤ 0.06) ceramics samples synthesized by a conventional route were investigated. These structural, microstructural, and dielectric properties were recorded using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) and impedance analyzer spectroscopies. Ti-O octahedral distortion was observed due to Sr 2+ addition. The microwave dielectric properties were interrelated with various Sr 2+ concentrations. Excellent microwave dielectric properties, i.e., high relative permittivity (ϵ r = 71.50) and low dielectric loss (tan δ = 0.0006), were obtained.