Thumbnail
Access Restriction
Open

Author Williams, Brent ♦ Clifford, Dustin ♦ Carpenter, Everett E. ♦ El-Gendy, Ahmed A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CONTROL ♦ COOLING ♦ CRYSTAL-PHASE TRANSFORMATIONS ♦ CRYSTALS ♦ IRON CARBIDES ♦ MORPHOLOGY ♦ NANOSTRUCTURES ♦ ORTHORHOMBIC LATTICES ♦ OXIDES ♦ SYNTHESIS ♦ TEMPERATURE RANGE 0400-1000 K ♦ THICKNESS ♦ X-RAY DIFFRACTION
Abstract A phase transition, from orthorhombic Fe{sub 3}C to hexagonal Fe{sub 7}C{sub 3}, was observed using a wet synthesis mediated by hexadecyltrimethylammonium chloride (CTAC). In this study, CTAC has been shown to control carbide phase, morphology, and size of the iron carbide nanostructures. Fe{sub 7}C{sub 3} hexagonal prisms were formed with an average diameter of 960 nm, the thickness of 150 nm, and Fe{sub 3}C nanostructures with an approximate size of 50 nm. Magnetic studies show ferromagnetic behavior with M{sub s} of 126 emu/g, and H{sub c} of 170 Oe with respect to Fe{sub 7}C{sub 3} and 95 emu/g and 590 Oe with respect to Fe{sub 3}C. The thermal studies using high temperature x-ray diffraction show stability of Fe{sub 7}C{sub 3} up to 500 °C. Upon slow cooling, the Fe{sub 7}C{sub 3} phase is recovered with an intermediate oxide phase occurring around 300 °C. This study has demonstrated a simple route in synthesizing iron carbides for an in depth magnetic study and crystal phase transition study of Fe{sub 7}C{sub 3} at elevated temperatures.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-21
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 120
Issue Number 3


Open content in new tab

   Open content in new tab