Quenched equilibrium states of Cu–31.1 at.% Zn and Cu–22.4 at.% Zn single crystals (prepared with the Cu-65 isotope) were investigated by elastic diffuse neutron scattering. The diffuse intensity showed maxima which are attributed to the flat portions of the Fermi surface in the <110> directions. Short–range order parameters and linear displacement parameters were obtained from a fit to the measured data. Pair interaction energies were determined based on the inverse Monte–Carlo method. An ordered low-temperature phase Cu3Zn with the DO23 structure is suggested.
Das System H /MoOä" wird Raman‐spektroskopisch im Bereich Z 1.14 (Säuregrad der Lösung) bei Ausgangskonzentrationen zwischen 0.02‐2 M M003,′ und Fremdsalzkonzentra tionen zwischen 2 [MoOä′]‐3 M M[C1,NO3] (M: Li, Na, K, NH4, Mg/2) untersucht.
Gallium arsenide crystals exhibit specific electrical and optical properties important for both electronic and optical device applications. However its material characteristics are still of significant interest to the electric industry. Beryllium is commonly used as a p-type dopant in GaAs grown by molecular beam epitaxy to increase thermal stability and to shorten the lifetimes of charge carriers. The aim of the presented paper is to find how the beryllium is incorporated into gallium arsenide lattice and study the microscopic structures around the beryllium atoms. High resolution X-ray study of GaAs:Be was already reported in our paper [3] indicating that Be position in the crystal lattice may play important role. Some reflections like (002) and (006), called quasi-forbidden reflections, have very small intensity due to the small difference in scattering factors between gallium and arsenic. The integral intensity of these reflections is very sensitive to composition and hardly sensitive to crystal lattice defects. The X-ray quasi-forbidden reflection method is based on comparison quasi-forbidden reflection intensities for the investigated crystal and for the ideal reference crystal [4]. References [1] G.
Phase separation of quenched supersaturated Ni-(9.5-12.0)at.% Ti single crystals was followed by small-angle neutron scattering during in-beam aging at 773, 813 and 853 K. With the incident beam along <110>, scattering maxima in directions were observed from the earliest stages of decomposition. While the results obtained at 773 K may be compatible with the general features of spinodal decomposition, a two-phase model with homogeneous precipitation in a depleted matrix is more appropriate at 813 and 853 K. Though scaling may be shown to hold, the aging kinetics is considerably slower than expected, which is related to a stabilizing effect of elastic coherency stresses.
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