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Nikolaev, A. M.; Kovalenko, A. S.; Frolov, K. V.; Kopitsa, G. P.; Baranchikov, A. E.; Shilova, O. A.
Russian Journal of Physical Chemistry A, 07/2023, Letnik: 97, Številka: 7Journal Article
Iron oxide nanopowders are synthesized via chemical precipitation. It is shown that synthesis produces an iron oxide phase with a magnetite structure (either a magnetite–maghemite solid solution or a mixture of this solid solution and goethite). The sizes of the CSR and particles for the main phase are ~10–20 nm. The synthesized iron oxide powders have developed surfaces, specific surface area S BET ≈ 92 and 117 m 2 /g, and identical fairly large specific pore volumes ( = 0.35 cm 3 /g). It is shown that additional in situ ultrasonic treatment of the magnetic iron oxide nanoparticles in the mother liquor results in abrupt oxidation of iron(II) ions and creates a nonmagnetic impurity phase of goethite.
