Binary and Ternary Alkali Graphite Intercalation Compounds: In-Situ X-Ray Study of Elastic and Electrostatic Effects on Staging

Abstract

We have studied stage transformations of binary potassium-graphite intercalation compounds by in-situ x-ray (00ℓ) scans. In the transition region of stages one and two, both stages coexist and all Bragg reflections exhibit resolution limited widths. The characteristics of the stage transformation are identical in intercalated HOPG and single crystals. This implies that the stage transformation is a direct process with no need of forming intermediate structures, favoring electrostatic interaction as the dominant stabilizer for pure stage donor compounds. We have also studied the elastic distortion due to potassium atoms substitutionally dissolved in rubidium intercalant layers. From the interlayer spacing variation we find a double force tensor Pzz = 0.36 eV for potassium defects in RbC8 in the small defect concentration region.

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Correspondence to M. E. Misenheimer.

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Misenheimer, M.E., Chow, P. & Zabel, H. Binary and Ternary Alkali Graphite Intercalation Compounds: In-Situ X-Ray Study of Elastic and Electrostatic Effects on Staging. MRS Online Proceedings Library 20, 283 (1982). https://doi.org/10.1557/PROC-20-283

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