Abstract
Potassium-graphite intercalation compounds with 7 different compositions ranging from KC300 to KC24 were prepared from exfoliated graphite sheet (Grafoil). Resistivity, magnetoresistance and hydrogen-sorption capacity of these compounds were determined. KC300 and KC250 showed semi-conductive temperature dependence of the resistivity as well as host Grafoil, while KC168 and more rich compounds showed metallic behavior. Dependence of the resistivity and magnetoresistance on the potassium concentration was divided into two regions with a critical concentration at about KC60-70. Both of these properties decreased considerably with increasing potassium concentration below this critical concentration, and then became almost constant above it. A remarkable correlation between transport properties and hydrogen-sorption capacity was suggested.
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