Metastable <I>bcc</I> Fe&ndash;Mn Alloys Produced by rf Sputtering

Abstract

Fe1-xMnx alloy films obtained by rf sputtering technique have been investigated by X-ray diffraction, magnetization and Mossbauer effect measurements. The single bcc phase extends up to about x=0.2, while a bcc-fcc mixed phase appears for x=0.2-0.26. The lattice constants of the bcc phase are about 0.5% larger than those of the bulk specimens. The magnetization decreases monotonically with increasing x in the bcc phase, while it decreases sharply in the bcc-fcc mixed phase. These results are consistent with the Mossbauer spectra of these alloy films. The volume fraction of bcc and fcc phases has been estimated from Mossbauer analyses as well as magnetization measurements.

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

“…103520, I m‐3 m(229)). Sumiyama et al reported that annealing a FeMn alloy at 670 K enabled a phase separation into thermal equilibrium bcc and fcc phases due to the enhanced atomic diffusion, especially in case of Fe‐rich FeMn alloys, which is in accordance with our finding that body‐centered cubic (bcc)– face‐centered cubic (fcc) mixed phases simultaneously appear in the Fe‐rich FeMn alloy structures obtained by LAL of FeMn in ethanol. We speculate that bcc and fcc mixed Fe‐rich FeMn alloy particles are the core and FeMn 2 O 4 structures are the shell of the core–shell particles for the following reasons.…”

Magnetic Properties of Metastable α-Mn-Type Mn1–yFey Alloys Produced by Vapor Quenching

“…The phase boundaries of the vapor quenched alloys are much different from the equilibrium phase diagram of Mnl-,Pe, alloys a t 290 K [3] : in the vapor quenched alloys, the single a-Mn-type phase is obtained for 0 5 y < 0.7 and the single a-Fe-type b.c.c. phase for 0.8 < y 5 1.0 [2), whereas the single phase regions of both the a-Mn-type and the cr-Fe-type b.c.c. are narrow in the equilibrium phase diagram [3].…”

“…solid solution of the cr-Fe type has been extended for 0.8 < y 5 1.0 and a b.c.c.-f.c.c. mixed phase has been obtained for 0.7 < y < 0.8 [2], whereas in the equilibrium phase diagram the single b.c.c. phase is stable only for y > 0.97 a t room temperature [3].…”

Structural and Magnetic Study of Fe-15,83%Mn-2,18%V and Fe-18,50%Mn-2,27%Cu Alloys

“…It is well known in Mössbauer spectroscopy that these six peaks indicates that the material represent ferromagnetic properties (or antiferromagnetic). In the studies and Sumiyama et al (1981) carried out, although the austenite (γ) and martensite (ε) phases of Fe-Mn alloys generally showed paramagnetic properties, α̕ phase is ferromagnetic. Therefore, the sextets belong to α̕ martensite phase in Fig.5.…”