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Table 4 FTIR vibration modes of HA sintered at 200 °C and references

From: The usability of ark clam shell (Anadara granosa) as calcium precursor to produce hydroxyapatite nanoparticle via wet chemical precipitate method in various sintering temperature

Assignments Vibrational frequencies (cm−1)
FTIR result Salma et al. (2010) Singh and Purohit (2011) Kamalanathan et al. (2014)
PO4 3− bending v 4 565 560, 599 567 568
PO4 3− stretching v 3 1024 1046 1046 1038
CO3 2− group v 3 1454 1424, 1424 1422 1421
OH structure 3744 1637, 3100–3700 3431 3425