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- W1990570010 abstract "The basal-plane resistivities ensuremath{rho} of stage-2--4 potassium-graphite intercalation compounds (K-GIC's) have been measured as functions of temperature T and pressure p using a contactless method. The pressure range investigated was 0--1.4 GPa. For stage-2 K-GIC (${mathrm{KC}}_{24}$) measurements were made in the temperature range 90--300 K, while for the higher-stage materials the range was mainly limited to 245--300 K. In all cases ensuremath{rho} increases with p through the anomalous regime near the phase transitions, whereas densuremath{rho}/dp is always negative in the stable high-p (high-stage) phases. Approximate p-T phase diagrams are deduced from anomalies in ensuremath{rho} corresponding to the staging and in-plane order-disorder transitions, respectively. In all cases the slopes dp/dT of the phase boundaries for the high-pressure staging transitions are such that the transitions extrapolate to positive T at atmospheric p, although no such transitions have been reported. The low-p staging-ordering phase boundary of ${mathrm{KC}}_{24}$ is particularly complex, involving segments with both dp/dTensuremath{rightarrow}0 (125200 K) and dp/dTensuremath{rightarrow}ensuremath{infty} (Tensuremath{approxeq}125 K). The p-T diagrams are compared with recent structural experiments and models. We suggest that the complexity of the ${mathrm{KC}}_{24}$ phase diagram is attributable to the weakly incommensurate in-plane structure at low p and T." @default.
- W1990570010 created "2016-06-24" @default.
- W1990570010 creator A5015908812 @default.
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- W1990570010 date "1987-05-15" @default.
- W1990570010 modified "2023-10-18" @default.
- W1990570010 title "Pressure-temperature phase diagrams of stage-2–4 potassium-graphite intercalation compounds deduced from anomalies in the basal-plane resistivity" @default.
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- W1990570010 doi "https://doi.org/10.1103/physrevb.35.8231" @default.
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