For the Pt3O1-CeO2(111) and Pt3O5-CeO2(111) structures, a new motif appears where an oxygen is located between the three platinum atoms. This is favorable because it forms three linear O-Pt-O motifs with the oxygen positions in the surface, which confers enough stability to the particle to compensate the differences between the Pt-Pt bond length and the distance between surface oxygen atoms.