ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The moments of the Au frequency spectrum have been calculated in the usual manner from available thermodynamic data. These results are expressed in terms of the effective Debye temperatures, ΘD(n). Unlike many materials, the values of ΘD(n) for Au increase monotonically with increasing n. Values of the characteristic temperature associated with the Debye–Waller factor are determined [ΘM(0, V0) = 171 ± 2°K and ΘM(300, V300) = 163 ± 1°K], and the temperature dependence of ΘM(T, VT) is estimated. Our results are compared with recent Mössbauer and X-ray data. The comparison with the Mössbauer measurements, which were performed at 4.2 ≤ T ≤ 100°K., yields a value of ̃4.4 for the internal conversion coefficient, α, for the 77 keV, γ-ray line of Au197, this agrees well with a recent independent determination of α = 4.23 ± 0.09. However, our results for ΘM(T, VT) disagree, to within quoted estimates of error, with the results of published X-ray measurements. It is suggested that additional X-ray experiments extending to low temperatures would help to resolve these discrepancies.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739471001037
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