  Recently, the electride materials, with excess anionic electrons confined in
their empty space, have received a growing attention due to their promising
applications in catalysis, nonlinear optics and spin-electronics. However, the
utilization of electride materials is limited by their thermal instability.
Here we introduce an alternative way to achieve the localized anionic electron
states via the removal of high symmetric Wyckoff sites of anions from the
existing sodalite compounds. Using four halide sodalites as the parental
structures, our simulation reveals that the materials after the removal of
anionic halide sites exhibit typical electride behaviors that are characterized
by the existence of localized electronic states near the Fermi level. Compared
to most previously studied electrides, these materials are expected to be more
thermally stable due to the complex structural framework and thus promising for
practical applications. Among them, Na$_4$(AlSiO$_4$)$_3$ manifests magnetic
electronic structure. We demonstrate that this magnetism originates from a
highly localized excess electron state surrounded by electronpositive alkaline
cations. Our results suggest Na$_4$(AlSiO$_4$)$_3$ could be a promising
spintronics component, thus encouraging further experimental study.
