High-pressure X-ray diffraction study on the structure of NaCl melt using synchrotron radiation

Satoru Urakawa, Naoki Igawa, Osamu Shimomura, Hideo Ohno

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Molten NaCl was analyzed by high-pressure X-ray diffraction experiments using synchrotron radiation up to 5 GPa and 1600 °C along the melting curve. The interference function Qi(Q) and the correlation function g(r) were derived from the diffraction data. The first-neighbor distance r1 is about 2.7 Å and the second-neighbor distance appears around 1.4r1-1.5r1. The coordination number, CN, of the nearest neighbor ions increases with pressure from 3.5 at 0.1 MPa to 4.5 at 5 GPa. This is the evidence that the NaCl melt has a B1-like structure with large vacancies over this pressure range and becomes densified by an increase in CN as a result of second neighbor compaction.

Original languageEnglish
Pages (from-to)341-344
Number of pages4
JournalAmerican Mineralogist
Issue number3
Publication statusPublished - Mar 1999


ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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