Even though Goldschmidt tolerance components can semi-quantitatively forecast structural distortion on the basis of steric hindrance in 3D perovskites, It's not necessarily simple to use to second perovskites, because the layered segregated constructions in 2nd perovskites enable the incorporation of larger organic and natural cations into the inorganic cages26,27,28,29,30. The https://crithitceramics.com/product/fireball/