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

Takeshi Usuki, Keiji Itoh, Yasuo Kameda, Osamu Uemura

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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
Volume39
Issue number11
Publication statusPublished - Nov 1998
Externally publishedYes

Fingerprint

Neutron diffraction
neutron diffraction
Liquids
liquids
Diffraction
diffraction
Chemical analysis
liquid alloys
Distribution functions
distribution functions
melting
Melting
shift
Atoms
atoms

Keywords

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

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Usuki, T., Itoh, K., Kameda, Y., & Uemura, O. (1998). Neutron diffraction study of liquid As-Se and As-Te systems. Materials Transactions, 39(11), 1135-1139.

Neutron diffraction study of liquid As-Se and As-Te systems. / Usuki, Takeshi; Itoh, Keiji; Kameda, Yasuo; Uemura, Osamu.

In: Materials Transactions, Vol. 39, No. 11, 11.1998, p. 1135-1139.

Research output: Contribution to journalArticle

Usuki, T, Itoh, K, Kameda, Y & Uemura, O 1998, 'Neutron diffraction study of liquid As-Se and As-Te systems', Materials Transactions, vol. 39, no. 11, pp. 1135-1139.
Usuki, Takeshi ; Itoh, Keiji ; Kameda, Yasuo ; Uemura, Osamu. / Neutron diffraction study of liquid As-Se and As-Te systems. In: Materials Transactions. 1998 ; Vol. 39, No. 11. pp. 1135-1139.
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