Question: An X-ray diffraction (XRD) experiment is carried out on a crystalline solid having FCC structure at room temperature. The solid undergoes a phase transformation

$An X-ray diffraction (XRD) experiment is carried out on a crystalline solid$

An X-ray diffraction (XRD) experiment is carried out on a crystalline solid having FCC structure at room temperature. The solid undergoes a phase transformation on cooling to -20C and shows orthorhombic structure with small decrease in its unit cell lengths as compared to the FCC unit cell lengths. As a result the (311) line of the XRD G pattern corresponding to the FCC system (a) will split into a doublet (b) will split into a triplet (c) will remain unchanged (d) will split into two separate doublets

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