Stage Stability and Stage Transformation of SbCl₅-Graphite Intercalation Compounds

Abstract

Stage stability and stage transition in SbCl₅-graphite intercalation compounds have been investigated by use of the in situ X-ray diffraction technique. A precise isotherm of stage n has been determined for stages up to 6. The stage-stability range in chemical potential Δμ(n) is evaluated from the isotherm. A comparison of Δμ(n) with the theoretical results of the electrostatic interlayer interaction model gives the ionicity of 1⁄4<f<1⁄2 for SbCl₅-graphite intercalation compounds. A very narrow two-phase region is observed in the stage transition region, in which two single-stage phases coexist in thermal equilibrium.