The effect of a gaseous oxygen concentration in a mixture with argon on plasmodynamic synthesis products in an iron–oxygen system is described. X-ray diffractometry and scanning and transmission electron microscopy data showed that the products contain three different modifications of iron oxide: magnetite Fe 3 O 4 , hematite α-Fe 2 O 3 , and ε-Fe 2 O 3 epsilon phase. A change in oxygen concentration leads to a significant change in the phase composition of the products and an increase in a yield of the ε phase.
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Сивков et al. (2017) studied this question.
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