Giant moment of Fe16N2 as evidenced by 57Fe NMR studies.

Abstract

A nuclear-magnetic-resonance study of ${\mathrm{Fe}}_{16}$${\mathrm{N}}_{2}$, ${\mathrm{Fe}}_{4}$N, and bcc \ensuremath{\alpha}-Fe phases, along with magnetization experiments on samples containing these phases, show that the average Fe moment for ${\mathrm{Fe}}_{16}$${\mathrm{N}}_{2}$ is between 2.7${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$ and 2.9${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$. This is in contrast to previous studies which report values ranging from 2.3${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$ to 3.5${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$. The results reported here indicate an average Fe moment for ${\mathrm{Fe}}_{16}$${\mathrm{N}}_{2}$ which is significantly enhanced compared with that for \ensuremath{\alpha}-Fe, and a moment for Fe atoms at the 4d sites which is greater than 3.0${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$. \textcopyright{} 1996 The American Physical Society.