Chemistry Reference
In-Depth Information
(a)
(b)
(c)
Velocity mms
-1
57
Fig. 6.20
In-beam Mössbauer spectra of
Fe in a a-Zr, b Sc, and c Pb
Fig. 6.21 Cage motion of Fe at interstitial equivalent positions. Fitting parameters for Mössbauer
spectra of Fe in a-Zr as functions of temperature, and a possible model to explain the temperature
dependence: a resonance areas, b quadrupole splitting DEq, and c center shifts d [
31
]
''cage sites'' as is shown in Fig.
6.21
d. This cage motion is considered as a
precursor to the long-range interstitial diffusion.
In the case of Sc in Fig.
6.20
b, there seems to be a similar cage motion
accompanied by both a quadrupole relaxation and a strong decrease of the area on
the doublet at the right hand side at 300 and 450 K. In the case of Pb, on the other
hand, the singlet shows a slight line broadening above 250 K, which could be due
