X ray diffraction analysis of molten KC1 and KBr under pressure: Pressure-induced structural transition in melt

Satoru Urakawa, Naoki Igawa, Osamu Shimomura, Hideo Ohno

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

The structures of molten KC1 and KBr were studied by energy dispersive X ray diffraction experiments under high temperature and high pressure using synchrotron radiation. The radial distribution function g(r) for molten KC1 and KBr was obtained at several points just above the melting temperatures up to 4 GPa. The second neighbor ionic distance decreases with pressure, although the nearest neighbor distance is almost constant. The coordination number of the nearest neighbor ions increases with pressure. Both melts transform from an open, simple-cubic-like structure into a more highly coordinated structure, probably a body-center-cubic-like structure. The structure of molten KC1 changes before the crystalline phase but the molten KBr transforms into a dense phase about the same time as the solid. In both KC1 and KBr melts the structural transition occurs over a narrow pressure range.

Original languageEnglish
Title of host publicationProperties of Earth and Planetary Materials at High Pressure and Temperature, 1998
EditorsMurli H. Manghnani, Takehiko Yagi
PublisherBlackwell Publishing Ltd
Pages241-248
Number of pages8
ISBN (Electronic)9781118664421
ISBN (Print)9780875900834
DOIs
Publication statusPublished - Jan 1 1997

Publication series

NameGeophysical Monograph Series
Volume101
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

ASJC Scopus subject areas

  • Geophysics

Fingerprint Dive into the research topics of 'X ray diffraction analysis of molten KC1 and KBr under pressure: Pressure-induced structural transition in melt'. Together they form a unique fingerprint.

  • Cite this

    Urakawa, S., Igawa, N., Shimomura, O., & Ohno, H. (1997). X ray diffraction analysis of molten KC1 and KBr under pressure: Pressure-induced structural transition in melt. In M. H. Manghnani, & T. Yagi (Eds.), Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998 (pp. 241-248). (Geophysical Monograph Series; Vol. 101). Blackwell Publishing Ltd. https://doi.org/10.1029/GM101p0241