M. GOLMOHAMMAD - Ceramic Engineering Department School of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
M. A. FAGHIHI SANI - Ceramic Engineering Department School of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
A. NEMATI - Ceramic Engineering Department School of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran

In this research, two-step sintering has been performed to consolidate nano-size BaSrTiO3 powders. The pressed green bodies were first heated at 1350°C to achieve a relative density of about 75%. Then they were cooled down and held at 1150°C for 0–16 h until they became fully dense. Application of two-step sintering for pure nanocrystalline BaSrTiO3 powders enabled the suppression of grain growth during the intermediate and final stages of sintering and production of near fully dense ceramics(higher than 99%) with 530nm grain size. In addition, effect of the grain size on electrical properties was studied. It was found that the dielectric constant decreased as the grain size decreased.

Nanocrystalline BaSrTiO3, two-Stepsintering electrical properties, grain growth