Structural phase transitions of SrF2 at high pressure

► The high-pressure study on SrF2 up to 50.3 GPa at room temperature. ► Two first-order phase transformations were observed at 6.8 and 29.5 GPa. ► The three stable structures are confirmed by Rietveld refinements. ► The cubic and orthorhombic phase co-exist at pressures down to ambient pressure. ► The bulk modulus indicates higher incompressibility of SrF2 under high pressure.