IR spectroscopy of barium hydrogen phosphate Original Research Article

The IR spectroscopic study on pelletised barium hydrogen phosphate (BHP) has been made. The distinct bands observed seem to be related with the PO bond of PO4 group. Around the ferroelectric transition at 315 K, the interionic band at 2650 cm−1 disappears on account of Ba⋯O ionic bond being broken. For the sample prepared at 500 K, the bands around 2000 and 2500 cm−1 appear intense, while broadening of bands due to various deformations like PO and PO–H takes place.