Hydrothermal treatment of electrochemically synthesized nanocrystalline magnetic iron oxide powder

• Published in: Science of sintering Vol. 39; no. 1; pp. 85 - 91
• Main Authors: Vulicevic, Lj, Ivanovic, N., Maricic, A., Sreckovic, M., Vardic, S., Plazinic, M., Tomic, Z.
• Format: Journal Article
• Language: English
• Published: International Institute for the Science of Sintering, Beograd 2007
• Subjects: electrochemical synthesis; hydrothermal treatment; magnetic iron oxides
• ISSN: 0350-820X; 1820-7413
• DOI: 10.2298/SOS0701085V

Magnetic iron oxide nano-powders were synthesised electrochemically, using a low-carbon steel electrode immersed in a NaCl aqueous solution, at constant temperature of the electrolyte, pH and current density. In the second step, portions of the starting admixture were boiled at ~360 K during two hours and autoclaved at various temperatures. Both the starting powder and the treated ones were examined by a standard XRD method, then uniaxially pressed into pellets under 400 MPa, and their electric and magnetic behavior during non isothermal heating was analyzed. Nano-prahovi magnetnih oksida gvozdja su sintetizovani elektrohemijskim postupkom, uz koriscenje elektroda od niskougljenicnog celika uronjenih u vodeni rastvor NaCl pri konstantnoj temperaturi elektrolita, pH i gustine struje. U drugoj fazi eksperimenta, jedan deo dobijene suspenzije je zagrevan pri ~360 K tokom dva sata a drugi je hidrotermalno obradjen pod razlicitim uslovima pritiska i temperature. Polazni i naknadno hidrotermalno obradjeni uzorci su podvrgnuti standardnoj rendgenskoj difrakcionoj analizi. Presovanjem pri 400 MPa dobijeni su cilindricni kompakti koji su dalje korisceni za ispitivanje promene elektricnih i magnetnih osobina sintetizovanih uzoraka oksida gvozdja tokom njihovog neizotermskog zagrevanja.