Despite the fact that Goldschmidt tolerance factors can semi-quantitatively predict structural distortion on the basis of steric hindrance in 3D perovskites, it is not easy to use to second perovskites, because the layered segregated buildings in 2D perovskites allow the incorporation of larger natural cations in the inorganic cages26,27,28,29,thirty. The https://crithitceramics.com/product/fireball/