Hexagonal $ABC$ as semiconducting ferroelectrics
  We use a first-principles rational-design approach to identify a previously-unrecognized class of ferroelectric materials in the $P63mc$ LiGaGe structure type. We calculate structural parameters, polarization and ferroelectric well depths both for reported and as-yet hypothetical representatives of this class. Our results provide guidance for the experimental realization and further investigation of high-performance materials suitable for practical applications. 
Joseph W. Bennett, Kevin F. Garrity, Karin M. Rabe, and David   Vanderbilt
cond-mat.mtrl-sci