Abstract
The effect of hydrostatic pressure on electronic properties of graphite-nitric acid and graphite-antimony pentachloride intercalation compounds is studied. The compressibility along the c-axis of stage 3 graphite-HNO 3 is (5.0 ± 1.0) × 10 −3 kbar −1, which is about 1.7 times as large as that of pristine graphite. The compressibility in the basal plane is much smaller than along the c-axis in both cases. Two observed dHvA frequencies of stage 4 graphite-HNO 3, 1.9 × 10 6 and 5.8 × 10 5 Oe, have pressure coefficients ca. 1.8 × 10 −2 kbar −1 and nearly zero, respectively. Large negative pressure dependences are found in both c-axis and basal plane resistivities of graphite-HNO 3 and graphite-SbCl 5. An anomaly is found in the pressure dependence of resistivities of graphite-HNO 3 around 5 kbar, which is possibly related with some structural transition.
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