Abstract
The 57Fe Mössbauer effect in Tm 2Fe 17N χ was measured in the temperature range 4.2–600 K. The temperature dependence of the 57Fe Mössbauer spectra shows a hyperfine field anomaly around the spin reorientation temperature ( T SR ≈ 190 K) where the easy magnetization direction changes from parallel to c ( T < T SR) to perpendicular to c ( T > T SR). At 4.2 K the 57Fe hyperfine field was found to have slightly increased after charging Tm 2Fe 17 with nitrogen. The 169Tm Mössbauer spectrum of Tm 2Fe 17N χ was measured at 4.2 K. From the quadrupolar splitting it was derived that interstitial solution of nitrogen atoms considerably increased the second-order crystal field parameter ( A 2 o≈300 Ka o −2 ) although the value reached is not much larger than found before in Tm 2Fe 17C.
Published Version
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