Hydrothermal treatment of electrochemically synthesised nanocrystalline magnetic iron oxide powder
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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 behaviour during non isothermal heating was analysed.