Whilst Goldschmidt tolerance variables can semi-quantitatively predict structural distortion on The premise of steric hindrance in 3D perovskites, it is not clear-cut to apply to second perovskites, since the layered segregated structures in 2nd perovskites enable the incorporation of larger organic and natural cations to the inorganic cages26,27,28,29,30. The clear https://crithitceramics.com/product/fireball/