Although Goldschmidt tolerance aspects can semi-quantitatively forecast structural distortion on the basis of steric hindrance in 3D perovskites, It's not at all simple to use to 2nd perovskites, as the layered segregated structures in 2nd perovskites enable the incorporation of larger sized natural cations in the inorganic cages26,27,28,29,30. The obvious https://crithitceramics.com/product/fireball/