“…There are 24 Raman active modes for the materials with the Pbnm space group, and they are 7 A g , 5 B 1g , 7 B 2g , and 5 B 3g . , Figure shows the temperature-dependent Raman spectra of the SmFeO 3 sample in the spectral range of 100–700 cm –1 from temperature 90 to 300 K. The mode assignments have been done according to the suggestion made by Weber et al The vibration modes A g (1) , A g (2) , and B 2g (2) at around 109, 142, and 157 cm –1 , respectively, are identified as a result of Sm–O bond stretching . The B 1g (2) , B 2g (3) , A g (4) , A g (5) , B 1g (4) , B 3g (3) , B 2g (5) , and A g (7) vibration modes that arise in the spectral range of 200–500 cm –1 are found to be mainly dominated by FeO 6 octahedron bending, squeezing, and scissoring-like bending. − The vibration mode around 624 cm –1 is attributed to the asymmetric stretching of the Fe–O bond, which is identified as B 2g (7) , although the behavior of this mode is similar to the A g mode …”