In the present study we synthesized conductive nanoscale [Ca24Al28O64]4+(4e-) (hereafter denoted as C12A7:e-) material, and reduced graphene oxide (rGO) was produced, which was unexpected; graphene oxide was removed after melting the sample. The conductivity of C12A7:e- composites synthesized at 1550 °C was 1.25 S cm-1, and the electron concentration was 5.5 × 1019 cm-3. The estimated BET specific surface area of the highly conductive sample was 20 m2 g-1. Pristine C12A7:e- electride was obtained by melting the composite powder, but the nano size of C12A7:e- particles could not be preserved; the value of conductivity was ∼28 S cm-1, electron concentration was ∼1.9 × 1021 cm-3, and mass density was 93%. For C12A7-x V x :e-, where x = 0.25 to 1, the conductivity improved to a maximum value of 40 S cm-1, and the electron density improved to ∼2.2 × 1021 cm-3; this enhancement in conductivity was also proposed by a theoretical study but lacked any associated experimental support.
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