Invar Properties of the Interstitial Carbides of Nd₂Fe₁₇

Author

X. D. Zhang
Mark G. Shumsky
William Joseph James, Missouri University of Science and TechnologyFollow
William B. Yelon, Missouri University of Science and TechnologyFollow

Abstract

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 Nd₂Fe₁₇C_x (x = 0.5, 1.0), which has the rhombohedral structure of the Th₂Zn₁₇ type, space group R3^-m. the interstitial carbides Nd₂Fe₁₇C_x, together with their parent Nd₂Fe₁₇, exhibit Invar-like thermal expansion anomalies below their Curie temperatures, T_c. Although the introduction of carbon into Nd₂Fe₁₇ leads to lattice expansion and enhancement of T_c, the observed positive spontaneous magnetostriction of the carbides is comparable with that of Nd₂Fe₁₇. 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.

Recommended Citation

X. D. Zhang et al., "Invar Properties of the Interstitial Carbides of Nd₂Fe₁₇," IEEE Transactions on Magnetics, Institute of Electrical and Electronics Engineers (IEEE), Jan 1995.

The definitive version is available at https://doi.org/10.1109/20.489704

Department(s)

Chemistry

Second Department

Physics

International Standard Serial Number (ISSN)

0018-9464

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1995 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 1995