Encyclopaedie der mathematischen Wissenschaften und

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11]. 1 New Generation Scattering Experiments Neutron and X-ray scattering are still one of the most powerful techniques for characterizing the atomic-scale structure of amorphous solids, although they F. E. ), Physics of New Materials © Springer-Verlag Berlin Heidelberg 1998 36 3 Structure Characterization of Solid-State Amorphized Materials supply only the one-dimensional information on the radial average of pair correlations. 14] based on accelerators have reached the stage of routine use in condensed materials research.

In the Cu-Au system, for example, we have only the phase transitions of the latter type on a fcc lattice. We may also include some cases of the segregation in the latter where component metals have the lattice of the same type; Cu-Ag is a typical example. 43]. In order to construct a phase diagram, we need to compute the entropy of atomic disorder on a given lattice at finite temperatures besides that associated with lattice vibrations which can be taken into account by standard methods if necessary.

2 shows the variation in S(Q) for the MA process of 4Ni + 6V ~ Ni4V6 as a function of milling time. 12 ~ o~ 00 NN '-' N Ni40V60 MA Ni40V60 MA ~11 U') 10 9 8 7 6 5 4 3 2 1 0 o hour 50 hours Ni40V60 MA 100 hours Ni40V60 MA 200 hours Ni40V60 MA 400 hours Ni40V60 MA 800 hours 5 10 Q 15 (A -I 20 25 30 Fig. 2. Neutron total structure factors S(Q) for MA process of 4Ni (fcc) + 6V (bcc) ..... Ni4 V6 (amorphous) as a function of milling time appear only from the Ni fcc crystal. These Bragg peaks are quickly broadened apd modified with increasing milling time.

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