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The work function of the electride [Ca24Al28O64]4+(e-)4 is presented (see figure). The intrinsic value of ca. 2.4 eV is close to that of potassium regardless of its high chemical stability under ambient atmosphere. This property originates from the intrinsic nature of electrons in 3D connected sub-nanometer-sized cages having a positive charge.
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Toda et al. (2007) studied this question.
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