Figure 48: Effect of value on HFD shape extracted from room temperature Mössbauer spectrum for small Fe particles. (a) = 0.01 T ( = 0, l = 0.36 mms−1, HR = 1.612, = 2.066); (b) = 0.1 T ( = 0, l = 0.35 mms−1, HR = 1.873, = 2.401); (c) = 0.5 T ( = 0, l = 0.34 mms−1, HR = 1.707, ).