Fig. 2: Crystallographic properties and microscopic morphology of MXPOs.
From: Ultra-high entropy rare earth phosphate against environmental corrosion
a The Raman spectra of MXPOs reflect the distortion of the P-O polyhedral. Intercepts of 950–1050 cm−1 were made to observe changes in the symmetric stretching vibrational peaks representing P-O bonds. b Taking the element Ce as an example, the XPS spectra show that the rare earth ions in the MXPOs are all in the + 3-valence state. c, d The sintered surface and elemental distribution of M75X25PO and its flat surface after polishing make it easy to distinguish between porosity and impurities. (for further detail see Supplementary Note. 4). e, f High-resolution lattice fringing images of M75X25PO and XPO in as well as the corresponding diffraction images of the SAED modes (inset figures). The plane spacing calculated by the Fourier transform of the image and the position of the polycrystalline rings obtained by diffraction can be corresponded to the standard data representing the M and X phases. SAED scale bar, 5 nm−1. g The particles of M75X25PO in which the distribution of the elements.
