TY - JOUR
T1 - Crystal structure of the high-temperature solid phases of choline tetrafluoroborate and iodide
AU - Ishida, Hiroyuki
AU - Ono, Hiroshi
AU - Ikeda, Ryuichi
PY - 1997
Y1 - 1997
N2 - 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.
AB - 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.
KW - Crystal structure
KW - Phase transition
KW - Powder X-ray diffraction
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U2 - 10.1515/zna-1997-8-923
DO - 10.1515/zna-1997-8-923
M3 - Article
AN - SCOPUS:0039969981
SN - 0932-0784
VL - 52
SP - 679
EP - 680
JO - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
JF - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
IS - 8-9
ER -