Processing and microwave dielectric properties of Sr5Ta4TiO17 ceramics

• Main Authors: Manan Abdul, Ahmad Arbab Safeer, Ullah Atta, Shah Abid A
• Format: Article
• Language: English
• Published: Sciendo 2018-03-01
• Series: Materials Science-Poland
• Subjects: electron microscopy; sintering; microwave ceramics
• Online Access: https://doi.org/10.1515/msp-2017-0085

Sr5Ta4TiO17 ceramics was processed via solid state mixed oxide sintering route. X-ray diffraction revealed single phase formation of Sr5Ta4TiO17 ceramics that crystallized into an orthorhombic crystal structure with a space group Pnnm with lattice parameters of a = 5.681 Å, b = 32.542 Å and c = 3.968 Å, refined by the least squares method. The unit cell density (ρth) was 6.71 g/cm3. The microstructure consisted of plate-like grains and the average size was increased from 2 μm to 5 μm with an increase in sintering temperature from 1450 °C to 1575 °C. Optimum microwave dielectric properties, i.e. єr ~ 66,Qufo ~ 8500 GHz and τf ~ 180 ppm/°C, were achieved for Sr5TaTiO17 ceramics sintered at 1550 °C for 4 h.