Hydrothermal treatment of electrochemically synthesized nanocrystalline magnetic iron oxide powder
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 hou...
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Published in | Science of sintering Vol. 39; no. 1; pp. 85 - 91 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
International Institute for the Science of Sintering, Beograd
2007
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Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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ISSN: | 0350-820X 1820-7413 |
DOI: | 10.2298/SOS0701085V |