Structure evolution upon chemical and physical pressure in (Sr1−xBax)2FeSbO6

In the (Sr1−xBax)2FeSbO6 double-perovskite system the gradual structural transformation from the monoclinic I2/m to tetragonal I4/m, cubic Fm-3m and hexagonal P63/mmc structure is seen upon the isovalent larger-for-smaller A-site cation substitution. High-pressure treatment under 4 GPa extends stability of the cubic Fm-3m structure within a wider substitution range of x.247