Reinvestigation of the system C4A.nH2O C4A.Co2.nH2O |
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Authors: | R Fischer H-J Kuzel |
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Affiliation: | Bundeskriminalamt, Wiesbaden, Germany;Mineralogisches Institut der Universität Erlangen-Nürnberg, Erlangen, Germany |
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Abstract: | The system C4A.nH2O C4A.CO2.nH2O has been reinvestigated at 22°, 100 % and 65 % relative humidity. Formation conditions, composition and crystallographic properties of the phases C4A.nH2O, C4A.1/2CO2.nH2O, C4A.CO2nH2O and their dehydration products have been studied by X-ray and elektron diffraction, infrared and Raman spectroscopy, dynamic weight-loss curves and differential thermal analysis. Only very limited solid solution occurs in the system. X-ray single crystal studies showed the quaternary compound C4A.1/2CO2.12H2O to be trigonal with space group R3c or Rc, lattice parameters . C4A.CO211H2O is triclinic with . Indexed powder diffraction data of both compounds are given. |
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