Interstitial modification of rare-earth intermetallics

Authors

• Ralph Skomski, University of Nebraska-LincolnFollow
• S. Murray, Trinity College, Dublin, Ireland
• S. Brennan, Trinity College, Dublin, Ireland
• J.M.D. Coey, Trinity College, Dublin, Ireland

Document Type

Article

Date of this Version

May 1993

Comments

Published by Am Inst of Physics. J. Appl. Phys. 73 (1993) 6940-6942. Copyright 1993. Permission to use. http://www.aip.org/.

Abstract

Interstitial modification of R₂Fe₁₇Z_x is studied with R=Y, Sm, and Z=N, C, B, Si, and S. Equilibrium interstitial concentrations are calculated using a lattice gas model. For gas-solid reaction a low solubility is obtained at high temperatures, whereas a solid-solid reaction is predicted to yield R₂Fe₁₇Z_1.5 in the high-temperature limit. Theoretical results are compared with data on Sm₂Fe₁₇C_x produced by solid-solid reaction at 500 °C. Volume expansions up to 4.8% were obtained, which corresponds to x≈2. The concentrations of interstitial boron and silicon are much lower.