Pressure-induced structural changes in liquid Ge33Te 67 and liquid Ge15Te85

Jumpei Nakamura, Ayano Chiba, Kazuhiko Tsuji

Research output: Contribution to journalArticle

Abstract

We have performed energy-dispersive X-ray di.raction measurements for liquid Ge33Te67 up to 9 GPa and observed a pressure dependence of the structure for the first time. We confirmed that the structure is diferent from the Ge(Te1/2)4 tetrahedral network in any pressure at the temperature higher than 740 °C. We observed a small expansion in the bond length with increasing pressure up to 2.4 GPa. We also investigated the pressure dependence of the structure of liquid GGe 15Te85 at constant temperature at around 730 °C. The pressure dependence was found to be similar to that of liquid Ge 33Te67, i.e., we confirmed that the structure is different from the tetrahedral network in this high temperature. Although the structure at 730 °C at ambient pressure is regarded as a "densely packed" structure in comparison to the lower-temperature structure, we clarified that the structure is still highly compressible.

Original languageEnglish
Article number064604
JournalJournal of the Physical Society of Japan
Volume79
Issue number6
DOIs
Publication statusPublished - 2010 Jun

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pressure dependence
liquids
expansion
x rays
temperature
energy

Keywords

  • Liquid Ge-Te alloy
  • Peierls distortion
  • Pressure
  • Structure
  • X-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pressure-induced structural changes in liquid Ge33Te 67 and liquid Ge15Te85. / Nakamura, Jumpei; Chiba, Ayano; Tsuji, Kazuhiko.

In: Journal of the Physical Society of Japan, Vol. 79, No. 6, 064604, 06.2010.

Research output: Contribution to journalArticle

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N2 - We have performed energy-dispersive X-ray di.raction measurements for liquid Ge33Te67 up to 9 GPa and observed a pressure dependence of the structure for the first time. We confirmed that the structure is diferent from the Ge(Te1/2)4 tetrahedral network in any pressure at the temperature higher than 740 °C. We observed a small expansion in the bond length with increasing pressure up to 2.4 GPa. We also investigated the pressure dependence of the structure of liquid GGe 15Te85 at constant temperature at around 730 °C. The pressure dependence was found to be similar to that of liquid Ge 33Te67, i.e., we confirmed that the structure is different from the tetrahedral network in this high temperature. Although the structure at 730 °C at ambient pressure is regarded as a "densely packed" structure in comparison to the lower-temperature structure, we clarified that the structure is still highly compressible.

AB - We have performed energy-dispersive X-ray di.raction measurements for liquid Ge33Te67 up to 9 GPa and observed a pressure dependence of the structure for the first time. We confirmed that the structure is diferent from the Ge(Te1/2)4 tetrahedral network in any pressure at the temperature higher than 740 °C. We observed a small expansion in the bond length with increasing pressure up to 2.4 GPa. We also investigated the pressure dependence of the structure of liquid GGe 15Te85 at constant temperature at around 730 °C. The pressure dependence was found to be similar to that of liquid Ge 33Te67, i.e., we confirmed that the structure is different from the tetrahedral network in this high temperature. Although the structure at 730 °C at ambient pressure is regarded as a "densely packed" structure in comparison to the lower-temperature structure, we clarified that the structure is still highly compressible.

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