
By H. Beck, H. -J. Güntherodt (auth.), Professor Dr. Hans Beck, Professor Dr. Hans-Joachim Güntherodt (eds.)
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Additional info for Glassy Metal II: Atomic Structure and Dynamics, Electronic Structure, Magnetic Properties
Example text
66] did not explicitly quote coordination numbers for a-FeTsP25 but it is clear from their data that values are generally lower than those observed in the crystal. 0 kg m-3 observed experimentally). '. ~J "~,'~' V Pd-Pd ~"~' " Eo-Eo 2~- 0 i 2 i 4, I i i 6 r/~ L 8 I I 10 I I I 2 I I 4 1 I I I 6 r/]~ 8 I 10 Fig. 21a, b. 39]. 31]. Both calculated distribution functions are based on the random trigonal prismatic model using cementite edge-sharing arrangements. Calculated and experimental data are in good agreement for Pd-Si but the P-Co P P D F shows a discrepancy near 4 A indicating the possibility of " F % p " edge-sharing arrangements in the glass.
32]). (r) was obtained by measuring the neutron scattering intensity from an alloy with a mixture of Ni isotopes, giving zero coherent scattering from Ni. 35]. pd(r) is not symmetrical, with a shoulder at high r values (this behaviour would be anticipated by comparison with crystalline Pd3Si). It seems likely, therefore, that the value of 9 is more accurate. 74]. 35], however. Firstly, there is no independent measurement of GGe_pd(r), but comparison with crystalline palladium-germanium alloys suggests a symmetrical Ge-Pd distribution.
30-1. b) ThermalBroadening A second contribution to the broadening of experimental RDFs, ~rth, results from the effects of thermal atomic motion. An average value of the thermal root mean square displacements (u2) 1/2 observed in crystalline solids gives some guide to the value of a,h. Due to correlation of the motion of near-neighbour atoms, (u-~)112 overestimates thermal broadening of the first two or three peaks in the R D F : near neighbours tend to vibrate with a small phase difference so that their separation is normally less than (u2) 1/2.