Abstract
The synthesis of gillespite BaFeSi4O10 was investigated under various experimental conditions: temperature 300–400 °C; pressure 0.1–1 kbar; duration of treatment 92–160 h. The run products were characterized by X-ray powder diffraction, scanning and transmission electron microscopy with an energy-dispersive spectrometer and differential scanning calorimetry (DSC). At 1 kbar for 160 h of treatment, an increase in temperature from 300 to 400 °C was found to increase the abundance and degree of crystallinity of gillespite even if a further decrease in pressure or reaction time may hinder gillespite formations. The effects of experimental conditions on the presence of other accessory phases and the yield and size of gillespite crystals were also discussed. Further characterization by DSC was carried out to determine the thermal stability of synthesized gillespite.
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