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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