The perfection and defect structure of organic hourglass inclusion K2SO4 crystals

William M. Vetter, Hirono Totsuka, Michael Dudley, Bart Kahr

Research output: Contribution to journalArticle

Abstract

Hourglass inclusion crystals of K2SO4 were grown from aqueous solutions containing the dye acid fuchsin, and studied by synchrotron white-beam X-ray topography and reciprocal space mapping. Both self-nucleated and larger, seeded dye-included crystals were prepared, as well as comparable undoped crystals. While the dye modified the crystals' habit strongly, X-ray topographs showed it had no influence on their dislocation configurations, which were typical for solution-grown crystals. No kinematical contrast arising from the presence of the dye was observed that indicated dye-induced strain in the crystal lattice. Growth sector boundaries were visible in the dyed crystals but not in undoped crystals, implying there was a slightly higher lattice mismatch across growth sector boundaries in the dye-included crystals. Reciprocal space maps of small areas on an hourglass inclusion crystal within either a dye-included growth sector or an undoped growth sector showed single peaks with the same perfect crystal rocking curve width and no dilatation or tilt of the host lattice resulting from the dye's presence. These results showed hourglass inclusion crystals can be grown in which the presence of the dye disturbs the crystalline structure of the host salt minimally, and that hourglass inclusions have the nature of a solid solution.

Original languageEnglish (US)
Pages (from-to)498-506
Number of pages9
JournalJournal of Crystal Growth
Volume241
Issue number4
DOIs
StatePublished - Jun 2002

Keywords

  • A1. High resolution X-ray diffraction
  • A1. X-ray topography
  • B1. Potassium compounds
  • B1. Sulfonate dyes
  • B2. Dye inclusions
  • B2. Habit modifiers

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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