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SHS in the Si–N–O System Containing Iron Salts

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Abstract

SHS in 3Si–SiO2–nAdd mixtures, where Add = FeCl3⋅6H2O or Fe2(C2O4)3⋅5H2O and n = 0.015–0.09 М, under 10 MPa of nitrogen gas was studied by XRD, SEM/EDS, and chemical analysis. The addition of gasifying salts decreased combustion temperature and improved phase composition of combustion products. In case of FeCl3⋅6H2O and n = 0.09 М, total yield of silicon oxynitrides Si2N2.2O0.8 and Si2N2O attained a value of 94 wt %, due to the presence of added iron. Crystal structure of the earlier unknown Si2N2.2O0.8 phase detected in combustion products derived from 3Si–SiO2–nFeCl3⋅6H2O mixtures was established by XRD analysis and crystallographic modeling.

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Authors and Affiliations

  1. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    T. V. Barinova, D. Yu. Kovalev & S. V. Konovalikhin

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  1. T. V. Barinova
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  2. D. Yu. Kovalev
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  3. S. V. Konovalikhin
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Correspondence to T. V. Barinova, D. Yu. Kovalev or S. V. Konovalikhin.

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Translated by Yu. Scheck

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Barinova, T.V., Kovalev, D.Y. & Konovalikhin, S.V. SHS in the Si–N–O System Containing Iron Salts. Int. J Self-Propag. High-Temp. Synth. 30, 65–72 (2021). https://doi.org/10.3103/S1061386221020035

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