In:
Journal of Physics: Condensed Matter, IOP Publishing, Vol. 33, No. 24 ( 2021-06-16), p. 244002-
Abstract:
The short-range order in liquid Si, Ge and binary Si x –Ge 1− x alloys ( x = 0.25, 0.50, 0.75) was studied by x-ray diffraction and reverse Monte Carlo simulations. Experiments were performed in the normal and supercooled liquid states by using the containerless technique of aerodynamic levitation with CO 2 laser heating, enabling deeper supercooling of liquid Si and Si–Ge alloys than previously reported. The local atomic structure of liquid Si and Ge resembles the β -tin structure. The first coordination numbers of about 6 for all compositions are found to be independent of temperature indicating the supercooled liquids studied retain this high-density liquid (HDL) structure. However, there is evidence of developing local tetrahedral ordering, as manifested by a shoulder on the right side of the first peak in S ( Q ) which becomes more prominent with increasing supercooling. This result is potentially indicative of a continuous transition from the stable HDL β -tin (high pressure) phase, towards a metastable low-density liquid phase, reminiscent of the diamond (ambient pressure) structure.
Type of Medium:
Online Resource
ISSN:
0953-8984
,
1361-648X
DOI:
10.1088/1361-648X/abf593
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2021
detail.hit.zdb_id:
1472968-4
detail.hit.zdb_id:
228975-1
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