Abstract
Gadolinium orthoferrite GdFeO3 nanoparticles were synthesized by co-precipitation of gadolinium and iron(m) hydroxides in a free impinging-jets microreactor followed by thermal treatment of co-precipitation products. According to X-ray diffraction, the co-precipitated hydroxides were X-ray amorphous, and the content of key elements within their composition corresponded to the stoichiometry of GdFeO3. Powder X-ray diffraction of the product of thermal treatment of hydroxides at 750 °C for 4 h indicated on the formation of GdFeO3 nanocrystals with a perovskite-like orthorhombic structure and an average crystallite size of 27±3 nm. Scanning electron microscopy showed that the gadolinium orthoferrite nanocrystals had an isometric morphology, and their specific surface area was determined by the Brunauer—Emmett—Teller method to be 13.55 m2g−1. Mössbauer spectroscopy and vibrational magnetometry showed that the obtained GdFeO3 nanoparticles were superparamagnetic and were characterized by a bimodal distribution of the effective field, indicating on their core—shell-type composite structure. The study of the composition, structure, morphology, and magnetic behavior of the obtained gadolinium orthoferrite nanoparticles showed that they can be used as a basis for contrast agents for magnetic resonance imaging (MRI).
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Based on the materials of the XXI Mendeleev Congress on General and Applied Chemistry (September 9–13, 2019, St. Petersburg, Russia).
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1290–1295, July, 2020.
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Albadi, Y., Sirotkin, A.A., Semenov, V.G. et al. Synthesis of superparamagnetic GdFeO3 nanoparticles using a free impinging-jets microreactor. Russ Chem Bull 69, 1290–1295 (2020). https://doi.org/10.1007/s11172-020-2900-x
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DOI: https://doi.org/10.1007/s11172-020-2900-x