The stage-1 alkali metal-graphite intercalation compounds, MC
8 (M=K, Rb, Cs), were prepared from Grafoil, and then ternary compounds were obtained by additional intercalation of ammonia. The electrical conductivity of those compounds were determined. The conductivity of KC
8 decreased considerably along with ammoniation in the region of ammonia content,
nNH3/
nK, less than 0.2. Similar behavior of conductivity change was also observed for RbC
8 for
nNH
3 /
n K≤ 0.4, except for slight decrease in the early stage up to
nNH
3/
nK=0.1. In contrast, the conductivity of CsC
8 decreased slightly by ammoniation in the region of
nNH
3/
nK≤0.6.
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