PHASE TRANSITION IN Fe3O4 /Fe2O3 NANOCOMPOSITES BY SINTERING PROCESS

Abstract

PHASE TRANSITION IN Fe₃O₄/Fe₂O₃ NANOCOMPOSITES BY SINTERING PROCESS. Fe₃O₄ powders have been successfully produced by using coprecipitation method. The characterization using X-Ray Diffraction method resulted in the size of Fe₃O₄ powders of 9.1 ± 0.3 nm. Samples were then formed into pellete and powders. Heat treatment at temperature 600 ^oC of powder samples for 1 hour and 2 hours give maghemite and hematite phases, but heat treatment at temperature 700-800 ^oC for 1 hour, 2 hours and 3 hours give only one phase namely hematite. Heat treatment at temperature 600 ^oC, 700 ^oC and 800 ^oC of pelletes for 1 hour, 2 hours and 3 hours give also only one phase which is hematite. Quantitative analysis using MAUD program resulted in Fe₃O₄/Fe₂O₃ composites with changing crystal size at increasing temperature.