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Table 2 FTIR vibration modes of Clam shell powder 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 Gunasekaran et al. (2006) Islam et al. (2013) Hoque et al. (2013)
v 4—Symmetric CO3 2− deformation 708 712 706 705
v 2—Asymmetric CO3 2− deformation 855 874 857 853
Symmetric stretching vibration of CO3 2− 1082 1082 1080
v 3—Asymmetric CO3 2− deformation 1454 1425 1455 1421
v 1 + v 4—CO3 2− deformation 1786 1798 1794
2v 2 + v 4—CO3 2− deformation 2520 2514
H2O stretching mode 3743 3378