ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Synthesis, structural, and magnetic properties of R3(Fe,Cr)29 intermetallic compounds (R=Ce,Nd) and their nitrides are reported. The Ce3(Fe,Cr)29 sample was single phase while the R=Nd ingot contained significant contamination by secondary phases. X-ray analysis reveals the monoclinic Nd3(Fe,Ti)29-type structure with space group A2/m. The unit cell dimensions for the parent R=Ce compound are a=10.513(2) A(ring), b=8.478(1) A(ring), c=9.657(1) A(ring), β=96.75(1)°, and V=854.70 A(ring)3. In the case of Ce a relative unit cell expansion of 6.5% is observed upon nitrogenation. The Curie temperature is 326 K for Ce and 432 K for Nd and becomes 612 and 633 K for Ce–nitride and Nd–nitride, respectively. The room temperature magnetization at 5 T is 58.2 A m2/kg for Ce and 104.1 A m2/kg for Nd and increases after nitrogenation to 109.8 and 127.2 A m2/kg for Ce and Nd, respectively. The average hyperfine field of the R=Ce compound at 85 K is 19.2 T. X-ray diffraction measurements on a magnetically aligned powder of Ce3(Fe,Cr)29 indicate that the magnetocrystalline anisotropy of the iron sublattice is most likely an in-plane type. Mössbauer spectrum analysis provided evidence that the Cr enters the dumbbell sites. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.362302
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