Study of LaFeO₃ perovskite material by high-pressure Raman scattering

Subtle Structural Changes in LaFeO3 at High Pressure

“…Previous high‐pressure Raman work showed the disappearance of one A g mode and the appearance of a new mode at ≈180 cm −1 at around 4 GPa, and suggested that this is an indicator of the progression of a second‐order Pnma – Ibnm phase transition occurring around 16 GPa. [ 48 ] We see no evidence of this mode appearing in our current study up to a pressure of 7.6 GPa. It should be noted that sample volume, and compression rate, can influence the observed structural changes.…”

“…[ 43 ] Raman patterns are in agreement with ambient pressure and pressure‐dependent Raman spectra previously reported for orthoferrites and LaFeO 3 . [ 42,44–48 ] Mode symmetries are assigned according to a previous ambient pressure study. [ 42 ]…”

Specific features of structural, magnetic, Raman and Mössbauer: Properties of La0.57Nd0.10Sr0.18Ag0.15FeO3 ferrite nanoparticules

“…5 a), the characteristic Raman bands of the LaFeO 3 structure dominate the spectrum. These bands are observed at 102.8, 148.2 and 172.1 cm −1 , which are ascribable to La-sites vibrations [26][27][28][29] , as well as at 253.0, 281.4, 395.9, 435.5 and 657.9 cm −1 , which originate in the Fe-sites. The frequencies of these bands match well the previously reported values (110, 145 and 170 cm −1 , in the case of the La-sites related vibrations [26][27][28][29] , and 255, 285, 400, 430 and 640 cm −1 for the Fe-sites [27][28][29] ).…”

“…These bands are observed at 102.8, 148.2 and 172.1 cm −1 , which are ascribable to La-sites vibrations [26][27][28][29] , as well as at 253.0, 281.4, 395.9, 435.5 and 657.9 cm −1 , which originate in the Fe-sites. The frequencies of these bands match well the previously reported values (110, 145 and 170 cm −1 , in the case of the La-sites related vibrations [26][27][28][29] , and 255, 285, 400, 430 and 640 cm −1 for the Fe-sites [27][28][29] ). The 395.9 and 435.5 cm -1 bands are ascribable to O-Fe-O bending vibrations, while that observed at 657.9 cm −1 is assigned to the O-Fe-O stretching modes [27][28][29][30][31] .…”