Properties of Powders Synthesized from Aqueous Solutions of Sodium Silicate and Iron Sulfate

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发表日期：

2024年9月1日

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T. V. Safronova,
M. R. Akhmedov,
K. S. Zakharov,
E. A. Motorin,
T. B. Shatalova,
Ya. Yu. Filippov,
A. M. Murashko,
T. V. Filippova,
O. V. Boytsova,
I. V. Kolesnik,
O. T. Gavlina,
P. E. Kazin

摘要

The phase composition of the powder synthesized from aqueous solutions of sodium silicate Na₂SiO₃ and iron sulfate FeSO₄ at the molar ratio Fe/Si = 2, as determined by x-ray diffraction (XRD) data, included hydrated sodium iron sulfate Na₂Fe(SO₄)₂ · 4H₂O and an x-ray amorphous product based on hydrated iron and silicon oxides. The phase composition of the powder obtained by fourfold washing of the synthesized powder in distilled water was represented by an x-ray amorphous product.

Following firing in the air at temperatures ranging from 400 to 1200°C, hematite (Fe₂O₃) and cristobalite (SiO₂) were identified in powder samples and the corresponding ceramics. Following firing at 900°C in graphite powder bedding, the phase composition of ceramic samples included magnetite (Fe₃O₄), laihunite (Fe_4.74(SiO₄)₃), and fayalite (Fe₂SiO₄). The powder prepared from the product isolated from the mother liquor included hydrated sodium iron sulfate, Na₂Fe(SO₄)₂ · 4H₂O, and sodium iron sulfate hydroxide hydrate (metasideronatrite), Na₄Fe₂(SO₄)₄(OH)₂ · 3H₂O. Following heat treatment at 400°C, sodium iron sulfate (Na₃Fe(SO₄)₃) was identified as the predominant phase in the powder. Powders resulting from the interaction of aqueous solutions of sodium silicate and iron sulfate can be used in the manufacture of high-temperature dyes and materials with magnetic properties, the creation of analogs of lunar or Martian regolith, as well as the development of functional (cathode) materials for Na-ion batteries.