The Effects of Sintering Temperature on the Physical and Electrical Properties of SrTiO₃ Ceramics Prepared Via Sol-Gel Combustion Method

Abstract

The SrTiO₃ ceramics was prepared via sol-gel combustion method by using citric acid as a fuel. Cubic perovskite structures of SrTiO₃ were obtained at 600°C. The SrTiO₃ powder was compacted into disks under pressure of 110 MPa, the pellets were sintered at 900–1300°C and the dwelling times were variable. The result shows that the density grain size and dielectric constant increased corresponding with the increasing of dwelling times. The grain size was about 124–300 nm. The SrTiO₃ sintered at 1300°C for 4 h shows the highest dielectric constant (ϵ_r = 382), dielectric loss tangent (tanδ < 0.5) and the density was about 4.42 g/cm³.

Keywords:

• SrTiO₃
• sol-gel
• dielectric constant