“…The peaks at 28.5°, 33.3°, 47.6°, 56.5°, 58.6°, 69.1°, 76.1°, 78.6°, and 88.3° correspond to the (111), (200), (220), (311), (222), (400), (331), (420), and (422) planes of the CeO 2 crystal phase, respectively [8]. The appearance of these peaks implies that CeO 2 exhibits a cubic fluorite structure.…”