For the orthorhombic and tetragonal alloy systems, the distortion angles in the corresponding alloy system will initiate from a large value, and the Pb–Br–Pb average distortion angle exhibits a decreasing trend with the reduction of the formation energy ( c.f.
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The stability of CsPb(Br<sub><i>x</i></sub>Cl<sub>1-<i>x</i></sub>)<sub>3</sub> all-inorganic mixed halide perovskites.
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