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- W2024862930 startingPage "3311" @default.
- W2024862930 abstract "We have used x-ray diffraction to study the structure of stage-4 through stage-11 potassium-intercalated graphite as a function of temperature. The (00.L) diffraction patterns are analyzed in terms of the Hendricks-Teller model for a disordered one-dimensional crystal. Stage 4--5 samples are best described by phase separation of two different stages, while higher-stage samples are best described by a broad distribution of many stages. In plane, all samples show a high-temperature two-dimensional fluid structure of the potassium atoms. In the stage 4--6 samples, the fluid peak gradually sharpens on cooling and increases in intensity to form a two-dimensional incommensurate superlattice. This evolution is consistent with a second-order transition. By contrast, the higher-stage samples show a strongly first order, hysteretic transition to a commensurate ensuremath{surd}7 ifmmodetimeselsetexttimesfi{} ensuremath{surd}7 superlattice at 235 K. In all cases, the expansion of the two-dimensional lattice upon freezing agrees within experimental error with the 2--4?increase in out-of-plane density of potassium layers." @default.
- W2024862930 created "2016-06-24" @default.
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- W2024862930 date "1987-03-01" @default.
- W2024862930 modified "2023-09-26" @default.
- W2024862930 title "Structure of high-stage potassium-intercalated graphite" @default.
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- W2024862930 doi "https://doi.org/10.1103/physrevb.35.3311" @default.
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