Partial substitution for vanadium in Bi4V2O11 can lead to the stabilization at room temperature of one of the three polymorphs alpha, beta, gamma exhibited by the mother compound. A tentative classification of the BIMEVOX phases based on these structural polytypes is carried out, and a review of the different identified ways to stabilize the gamma-type phases, the most performant ones in term of oxide anion conduction, is proposed. The experimental results clearly indicate that the predominant parameter is not the size or the valence state of the dopant, but rather the structural parameter correlated with he ability for the dopant to regularize the diffusion slab between the Bi2O2 sheets in these layered materials.