Preparation of Hydrated Strontium Silicates from Silica Hydrogel Isolated from Serpentines and Their Thermal Transformations
- Authors: Beglaryan H.A.1,2, Melikyan S.A.1, Terzyan A.M.1, Isahakyan A.R.1, Zulumyan N.H.1
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Affiliations:
- Institute of General and Inorganic Chemistry
- Erevan State University
- Issue: Vol 63, No 11 (2018)
- Pages: 1395-1402
- Section: Synthesis and Properties of Inorganic Compounds
- URL: https://journal-vniispk.ru/0036-0236/article/view/169068
- DOI: https://doi.org/10.1134/S0036023618110025
- ID: 169068
Cite item
Abstract
Interaction between silica hydrogel isolated from serpentines (Mg(Fe))6[Si4O10](OH)8, sodium hydroxide NaOH, and strontium chloride SrCl2 in aqueous medium was studied by DTA and X-ray powder diffraction (XRD). Stirring of the boiling aqueous suspension prepared from these reagents under the atmospheric pressure for 2 h yields hydrated strontium silicate species: Sr3Si2O7 · 4H2O and Sr3Si2O7 · 3H2O or their mixtures, whose heating to 810–825°C is accompanied by some phase transformations: strontium metasilicate Sr3Si3O9 or strontium orthosilicate Sr2SiO4 is formed after bound water is removed in the range 250–350°C, and strontium silicate SrSiO3 is formed at higher temperatures. Sr2SiO4 single phase is observed upon heat treatment to 700–750°C. The optimal molar ratio of the reagents was found to favor Sr2SiO4 formation.
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About the authors
H. A. Beglaryan
Institute of General and Inorganic Chemistry; Erevan State University
Author for correspondence.
Email: Hayk_b@ysu.am
Armenia, Yerevan, 0051; Yerevan, 0025
S. A. Melikyan
Institute of General and Inorganic Chemistry
Email: Hayk_b@ysu.am
Armenia, Yerevan, 0051
A. M. Terzyan
Institute of General and Inorganic Chemistry
Email: Hayk_b@ysu.am
Armenia, Yerevan, 0051
A. R. Isahakyan
Institute of General and Inorganic Chemistry
Email: Hayk_b@ysu.am
Armenia, Yerevan, 0051
N. H. Zulumyan
Institute of General and Inorganic Chemistry
Email: Hayk_b@ysu.am
Armenia, Yerevan, 0051
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