Crystal structure of the high-temperature solid phases of choline tetrafluoroborate and iodide

Hiroyuki Ishida, Hiroshi Ono, Ryuichi Ikeda

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2 Citations (Scopus)

Abstract

The crystal structure of the highest- and second highest-temperature solid phases of choline tetrafluoroborate and iodide was determined by X-ray powder diffraction. The structure in the highest-temperature phase of both salts is NaCl-type cubic (a = 10.16 (2) Å, Z = 4 for tetrafluoroborate; a = 10.08 (2) Å, Z = 4 for iodide). The second highest-lemperature phase of tetrafluoroborate and iodide is CsCl-lype cubic (a = 6.198 (6) Å and Z = 1) and tetragonal (a = 8.706 (2) Å, c = 6.144 (6) Å, and Z = 2), respectively. DSC was carried out for the iodide, where the presence of three solid-solid phase transitions was confirmed. Enthalpy and entropy changes of these transitions were evaluated.

Original languageEnglish
Pages (from-to)679-680
Number of pages2
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume52
Issue number8-9
Publication statusPublished - Aug 1 1997

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Keywords

  • Crystal structure
  • Phase transition
  • Powder X-ray diffraction

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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