Molten Salt Synthesis of Bi2SiO5 Powders Based on Uniform Experiment

Abstract

In this article, Bi2SiO5 powders were prepared by molten salt method. Via uniform experiment, the effects of various technological parameters (sintering temperature, holding time, excessive contents of Bi2O3 by weight, and ratios of salts) on synthesis of Bi2SiO5 powders were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermal analysis. Forming mechanism of sheets was discussed. According to the analysis of XRD and SEM, the sample mainly contains Bi2SiO5 phase when the temperature is 650°C, holding time is 2.5 h, excessive content of Bi2O3 is 5 wt%, and the ratio of salts is 50 wt%. Interface reacting mechanism can be used to explain the coarsening process of bismuth silicate sheets produced in molten salt synthesis. In addition, dissolution–precipitation mechanism also plays an important role in the synthesis of bismuth silicate sheets.