Pressure-induced structural change in liquid GeTe and liquid GeSe

Masatoshi Tomomasa, Takuya Higaki, Takazumi Hayakawa, Ayano Chiba, Kazuhiko Tsuji

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

X-ray diffraction has been measured up to 19 GPa for liquid GeTe and up to 15 GPa for liquid GeSe using synchrotron radiations. Static structure factor S(Q) and pair distribution function g(r) was obtained. Both S(Q) of liquid GeTe and liquid GeSe change their shape with increasing pressure, indicating anisotropic contraction of the local structure. A sharp change in S(Q) and g(r) was observed in liquid GeTe between 1.8 GPa and 4.0 GPa. Pressure dependences of S(Q) and g(r) of liquid GeSe change around 6 GPa. In liquid GeSe a small pre-peak was observed around 1.2 Å-1 up to 1.7 GPa which suggests the presence of the medium range order of covalent bond network. With increasing pressure the Peierls-type distortion becomes small and the bond angle decreases; the local structure becomes a rhombohedral structure. These pressure dependences of the structure of liquid GeTe and liquid GeSe are different from those of the crystals. These results are compared with those of other liquids and discussed in relation to the bonds between atoms in the liquids.

Original languageEnglish
Article number022007
JournalJournal of Physics: Conference Series
Volume121
Issue numberPART 2
DOIs
Publication statusPublished - 2008

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liquids
pressure dependence
covalent bonds
contraction
synchrotron radiation
distribution functions
diffraction
crystals
atoms
x rays

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pressure-induced structural change in liquid GeTe and liquid GeSe. / Tomomasa, Masatoshi; Higaki, Takuya; Hayakawa, Takazumi; Chiba, Ayano; Tsuji, Kazuhiko.

In: Journal of Physics: Conference Series, Vol. 121, No. PART 2, 022007, 2008.

Research output: Contribution to journalArticle

Tomomasa, Masatoshi ; Higaki, Takuya ; Hayakawa, Takazumi ; Chiba, Ayano ; Tsuji, Kazuhiko. / Pressure-induced structural change in liquid GeTe and liquid GeSe. In: Journal of Physics: Conference Series. 2008 ; Vol. 121, No. PART 2.
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