Neutron diffraction study of liquid As-Se and As-Te systems

Takeshi Usuki, Keiji Itoh, Yasuo Kameda, Osamu Uemura

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8 Citations (Scopus)


The neutron diffraction measurement in liquid AsxSe1-x and AsxTe1-x alloys with x=0.20∼0.571 has been carried out to analyze the local atomic arrangement in these liquid alloys. The first sharp diffraction peak (FSDP) of the structure factor, S(Q), in the liquid As-Se alloys was observed at all x, indicating that existing structural units are partially connected as in the amorphous state, while, the FSDP in the liquid As-Te alloys almost disappears, particularly, in the Te rich composition range. The first peak of atomic pair distribution function, g(r), in the liquid As-Se alloys is well-resolved, reflecting the strong As-Se covalent bondings. On the other hand, the first peak of g(r) in the liquid As-Te alloys is broadened and its position largely shifts with x. Results by the least square analysis for diffraction intensities have been summarized as follows: The connecting AsSe3/2 pyramidal unit, which is the basic structural element at As2Se3, is formed over a wide composition range in the As-Se alloys but bondings between like atoms such as Se-Se and As-As are present only in the limited composition range. On the other hand, in the liquid As-Te alloys both As-As and Te-Te bondings, in addition to the As-Te one, can be observed at all x containing As2Te3. The results have also pointed out that the metallic property of the liquid As-Te alloys is attributable to the change of the bonding nature relating to Te on melting.

Original languageEnglish
Pages (from-to)1135-1139
Number of pages5
JournalMaterials Transactions, JIM
Issue number11
Publication statusPublished - Nov 1998
Externally publishedYes


  • Liquid As-chalcogen alloys
  • Local atomic arrangement
  • Neutron diffraction
  • Pair distribution function
  • Structure factor

ASJC Scopus subject areas

  • Engineering(all)


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