Composite Powders Synthesized from the Water Solutions of Sodium Silicate and Different Calcium Salts (Nitrate, Chloride, and Acetate).

Composite powders were synthesized from the water solutions of sodium silicate and different calcium salts (nitrate, chloride, and acetate) at a Ca/Si molar ratio of 1.0. According to the XRD data, all the synthesized powders included hydrated calcium silicate Ca_1,5SiO_3,5·xH₂O (Ca/Si molar ratio = 1.5) and calcium carbonate CaCO₃ (Ca/Si molar ratio = ∞). The presence of H₂SiO₃ or SiO₂·xH₂O in the synthesized powders was assumed to be due to the difference between the Ca/Si molar ratio of 1.0 specified by the synthesis protocol and the molar ratio of the detected products. Reaction by-products (sodium nitrate NaNO₃, sodium chloride NaCl, and sodium acetate NaCH₃COO) were also found in the synthesized powders after filtration and drying. According to the XRD data phase composition of all powders after washing four times consisted of the quasi-amorphous phase and calcium carbonate in the form of calcite. Calcium carbonate in the form of aragonite was detected in powders synthesized from calcium chloride CaCl₂ and calcium nitrate Ca(NO₃)₂ before and after washing. Synthesized powders containing reaction by-products and washed powders were used for the preparation of ceramics at 900, 1000, and 1100 °C. The phase composition of the ceramic samples prepared from the washed powders and powder containing NaCl after firing at 900 and 1000 °C consisted of β-wollastonite β-CaSiO₃, and, after firing at 1100 °C, consisted of both β-wollastonite β-CaSiO₃ and pseudo-wollastonite α-CaSiO₃. The phase composition of the ceramic samples prepared from powders containing sodium nitrate NaNO₃ and sodium acetate NaCH₃COO after firing at 900, 1000, and 1100 °C consisted of calcium sodium silicates, i.e., Na₂Ca₂Si₃O₉ (combeite) and Na₂Ca₃S_i2O₈. Synthesized and washed composite powders can be used for the preparation of biocompatible materials, in the technology of construction materials, and as components of lunar soil simulants. [ABSTRACT FROM AUTHOR]