FABRICATION OF STRONTIUM SILICATE BY SOL-PRECIPITATION METHOD

Strontium silicate precursor powder was prepared by sol-precipitation. After TGA/DTA measurements, the powder was heated at 973K for 8 hours to obtain the corresponding compound. It is indicated from x-ray diffraction patterns that the major compound is SrSiO₃.

The preparatory conditions of forming strontium silicate powder in an alkaline solution, such as the effects of pH value and alkoxy ligand on the powder, have been studied.

In this study, it is indicated that:

(1) Using various alkoxy groups as the ligand, the less carbon number of alkoxy group has, the much faster of the hydrolysis is. It makes the particle size much bigger.

(2) In various pH values, the higher pH value has, the much faster of the hydrolysis is, and the larger of the particle size becomes.

(3) The sintering behaviours of various particle size powders are also investigated. The more carbon number of alkoxy group has, the bigger the grain size is, the more densification of the bulk density and the less of the linear shrinkage in sintering are. The electrical resistivity of the sintered body is 10⁴~10⁸ ohm-cm, belonging to a semiconductor material.

(4) From the variations of susceptibility with temperature analyzed by SQUID, we found that this compound is diamagnetism substance.

(5) The electrical resistivity and dielectric constant of SrSiO₃ are also determined.