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Disentangled structural and vibrational characteristics of methylammonium halide perovskite MAPbBr3-Cl with x = 0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"> <mml:mrow> <mml:mo>∼</mml:mo> </mml:mrow> </mml:math> 3 studied by X-Ray diffraction and Raman scattering