Invar properties of the interstitial carbides of Nd{sub 2}Fe{sub 17}

Journal Article · Wed Nov 01 04:00:00 EST 1995 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.489704· OSTI ID:186955

Zhang, X D; Shumsky, M G; James, W J ^[1]; Yelon, W B ^[2]

---

1. Univ. of Missouri, Rolla, MO (United States). Graduate Center for Materials Research
2. Univ. of Missouri, Columbia, MO (United States). Research Reactor Center

High-temperature x-ray diffraction experiments from 50 C to 400 C have been carried out to measure the thermal variations of the lattice parameters of Nd{sub 2}Fe{sub 17}C{sub x} (x = 0.5, 1.0), which has the rhombohedral structure of the Th{sub 2}Zn{sub 17} type, space group R{bar 3}m. The interstitial carbides Nd{sub 2}Fe{sub 17}C{sub x}, together with their parent Nd{sub 2}Fe{sub 17}, exhibit Invar-like thermal expansion anomalies below their Curie temperatures, {Tc}. Although the introduction of carbon into Nd{sub 2}Fe{sub 17} leads to lattice expansion and enhancement of {Tc}, the observed positive spontaneous magnetostriction of the carbides is comparable with that of Nd{sub 2}Fe{sub 17}. It is proposed that such a spontaneous magnetostriction can be ascribed to the occurrence of some short Fe-Fe distances and the strong distance dependence of the positive and negative interactions.

• OSTI ID: 186955
• Report Number(s): CONF-950404--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 6Pt2 Vol. 31; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EXPERIMENTAL DATA
IRON CARBIDES
LATTICE PARAMETERS
MAGNETIC PROPERTIES
NEODYMIUM CARBIDES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K