TY - JOUR UR - http://stacks.iop.org/0953-8984/27/i=22/a=225403 T1 - Anisotropy in the Raman scattering of a CaFeO 2.5 single crystal and its link with oxygen ordering in Brownmillerite frameworks A1 - Andrea Piovano and Monica Ceretti and Mark R Johnson and Giovanni Agostini and Werner Paulus and Carlo Lamberti Y1 - 2015 SP - 225403 JF - Journal of Physics: Condensed Matter VL - 27 IS - 22 SN - 0953-8984 N2 - Periodic DFT calculations allow an understanding of the strong orientation-dependent Raman spectra of oriented CaFeO 2.5 single crystals. Modes involving the oscillation of the apical oxygen (O ap ) atoms perturb the induced electric dipoles. These are formed by anisotropy in the charge distribution and are found to be strongly enhanced when the electric field of the linearly polarized laser line is parallel to the b axis. For the CaFeO 2.5 ordered system, strong polarizability of these modes corresponds to strong Raman intensities. Conversely, the apical oxygen disorder observed in low-temperature oxygen-conducting SrFeO 2.5 destroys the long-range coherence of the respective Raman modes, which consequently show a strongly reduced intensity. This study provides a vibrational tool to discriminate between ordered and disordered isomorporphous ABO 2.5 Brownmillerite frameworks. Furthermore, in combination with DFT calculations, we have found that the weakening of the interlayer interactions is responsible for the loss of ordering in Brownmillerite compounds. ER -