Pressure-induced structure change of molten KCI

Satoru Urakawa, Naoki Igawa, Norimasa Umesaki, Kazuo Igarashi, Osamu Shimomura, Hideo Ohno

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Abstract

Energy-dispersive X-ray diffraction experiments of molten KCl under high pressure have been carried out by using synchrotron radiation. The diffraction profiles of molten KCl were acquired just above the melting temperature of KCl up to 4 GPa. The reduced structure factor S(Q)'s for molten KCl do not show any change in their primary features, except for a gradual increase in the first peak intensity with increasing pressure. This implies that molten KCl does not show a first-order phase transition, such as the B1-B2 transition, found in solid KCl, but that the local structure in molten KCl must be changed by compression. According to a molecular-dynamics simulation, this change of S(Q) can be explained by a continuous increase in the coordination number of the nearest-neighbor ions in molten KCl with pressure.

Original languageEnglish
Pages (from-to)375-382
Number of pages8
JournalHigh Pressure Research
Volume14
Issue number4-5
Publication statusPublished - Dec 1 1996

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Keywords

  • Coordination number
  • Molten salt
  • Potassium chloride
  • Synchrotron radiation
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Urakawa, S., Igawa, N., Umesaki, N., Igarashi, K., Shimomura, O., & Ohno, H. (1996). Pressure-induced structure change of molten KCI. High Pressure Research, 14(4-5), 375-382.