In Situ X-Ray Investigations of Staging and Sequencing In Potassium-Graphite Intercalation Compounds

Experimental investigations, using 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 (GREATERTHEQ) 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. However, the transition between stage n and stage n+1 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 transition becomes more continuous.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Misenheimer, Mark Eugene

• Physics, Condensed Matter

Language dc:language

eng

Identifier

(UMI)AAI8521837

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/77381