Short range order and topology of Te-rich amorphous Ge-Sb-Te alloys
arxiv(2024)
Abstract
The structure of evaporated amorphous Ge_xSb_xTe_100-2x (x = 6, 9,
13) alloys was investigated by neutron diffraction, X-ray diffraction and
extended X-ray absorption spectroscopy (EXAFS) at the Ge, Sb and Te K-edges.
Large scale structural models were generated by fitting the experimental
datasets (5 for each composition) simultaneously in the framework of the
reverse Monte Carlo simulation technique. It was found that the alloys are
chemically ordered (Ge and Sb have predominantly Te neighbors) and within the
experimental uncertainty each component satisfies the 8-N rule. A comparison
with the pair correlation functions of melt quenched Ge_20Te_80
revealed that the first minimum of g_TeTe(r) is shallower in the
ternary alloys than in Ge_20Te_80. On the other hand, the separation of
the first and second coordination environments of Ge atoms is stronger in the
Ge-Sb-Te alloys investigated.
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