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Zabel, Hartmut Misenheimer, Mark Eugene 2011-06-06T16:16:52Z 2011-06-06T16:16:52Z 10000-01-01 1985 Experimental investigations, us i n9 x-ray diffraction techniques, have been made into the phenomenon of staging in graphite intercalation compounds. These studies have been performed in situ by means of a two-zone, high-temperature, x-ray furnace. The transition from stage 1 to stage 2 is found to be a two-phase process which does not require intermediate steps. For stage n, n > 2, stage mixing is shown to occur in thermodynamic equilibrium. The amount and relative concentration of admixed stages is seen to be a continuous function of the thermodynamic parameters. Hm~ever, the transition between stage n an~ stage n+l still exhibits a discontinuity which can be characterized as a gap in the allowed concentrations for stage admixing. The size of this gap decreases with increasing stage, i.e., the trans i ti on becomes more continuous. Various proposed theories for staging are discussed. It is concluded that the intercalate-intercalate screened coulomb interaction is the stabilizing force for staging. Stage mixing is seen to be a direct consequence of finite domain size and entropy. It is unclear whether the discontinuous nature of the stage transitions is a true miscibility gap resulting from a first-order transition or whether it is an apparent miscibility gap resulting from the particular form of a predicted second-order transition for staging transitions. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T16:16:52Z No. of bitstreams: 1 1985_misenheimer.pdf: 2951205 bytes, checksum: faa8cdb9db61bd05c24302f60ea9a479 (MD5) Made available in DSpace on 2011-06-06T16:16:52Z (GMT). No. of bitstreams: 1 1985_misenheimer.pdf: 2951205 bytes, checksum: faa8cdb9db61bd05c24302f60ea9a479 (MD5) Previous issue date: 1985 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-06T16:16:52Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:14:20-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 864938 http://hdl.handle.net/2142/25293 en 1985 Mark Eugene Misenheimer in situ x-ray investigations staging sequencing potassium-graphite intercalation compounds In situ x-ray investigations of staging and sequencing potassium-graphite intercalation compounds Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.