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

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Table 2 FTIR vibration modes of Clam shell powder and references

Assignments	Vibrational frequencies (cm⁻¹)
Assignments	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	–