The single crystal elastic constants of selected structures from the Materials Project database were calculated in the density functional theory (DFT) approach with periodic unit cell and atomic basis sets, as implemented in the CRYSTAL17 code, 20 using the PBEsol exhangecorrelation function and POB double-𝜁 + polarization basis sets. After the unit cell of the material is fully relaxed, optimizing both atomic positions and unit cell parameters, the elastic constants of these relaxed structure are then calculated by applying adimensional strains of ±1%. The elastic stiffness matrices obtained were checked against Born's stability condition, namely that the symmetric stiffness tensor is positive-definite. The elastic tensors were then analyzed with the online ELATE application.