TY - JOUR
T1 - The perfection and defect structure of organic hourglass inclusion K2SO4 crystals
AU - Vetter, William M.
AU - Totsuka, Hirono
AU - Dudley, Michael
AU - Kahr, Bart
N1 - Funding Information:
Topography was carried out at the Stony Brook Synchrotron Topography Facility, Beamline X19-C, at the NSLS, which is supported by the US Department of Energy.
PY - 2002/6
Y1 - 2002/6
N2 - 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.
AB - 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.
KW - A1. High resolution X-ray diffraction
KW - A1. X-ray topography
KW - B1. Potassium compounds
KW - B1. Sulfonate dyes
KW - B2. Dye inclusions
KW - B2. Habit modifiers
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U2 - 10.1016/S0022-0248(02)01325-8
DO - 10.1016/S0022-0248(02)01325-8
M3 - Article
AN - SCOPUS:0036609154
SN - 0022-0248
VL - 241
SP - 498
EP - 506
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 4
ER -