Structure and Magnetic Properties of the Nanocrystalline (Mechanically Alloyed) and Annealed Cementite

The structure, localization of C atoms in the lattice, magnetic moment per Fe atom, coercivity, and the hyperfine interaction parameters of the mechanically alloyed and annealed cementite at 525 and 775 K have been studied using X-ray diffraction, Mossbauer spectroscopy, and magnetic measurements. T...

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Main Authors: Yelsukov, E P, Ulyanov, A I, Ulyanov, A L, Chulkina, A A, Maratkanova, A N
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:The structure, localization of C atoms in the lattice, magnetic moment per Fe atom, coercivity, and the hyperfine interaction parameters of the mechanically alloyed and annealed cementite at 525 and 775 K have been studied using X-ray diffraction, Mossbauer spectroscopy, and magnetic measurements. The nanocrystalline cementite, (Fe3C)D, with a grain size L'10 nm is characterized by carbon atoms occupying both prismatic and octahedral interstices. In the cementite, Fe3C, annealed at 775 K, carbon atoms are localized only in prismatic interstices. Both types of cementite have an orthorhombic lattice (space group Pnma) and close magnetic moments per Fe atom and average hyperfine interaction parameters. The coercivity Hc of the Fe3C is three times higher than that of the (Fe3C)D cementite due to a large magnetocrystalline anisotropy constant.
ISSN:0094-243X
DOI:10.1063/1.3030848