Table 4: The Progress in the Optical Density Values of the Assignment Groups on Zn-c-SBF, Measured According to Kubelka- Munk Function

Zn-c-SBF
Group Assignment	Wavenumber 1/λ cm-1	“Kubelka-Munk” Units
		Zn-2p	Zn-3p	Zn-4p	Zn-5p
OH stretching vibration	3387	0.031	0.053	0.766	2.049
OH bending vibration	626	0019	0.010	0.345	0.458
H-O-H scissors	1635 - 1645	0008	0.012	0.305	0551
“C-O” stretch ν3	1400 - 1456	0.220	0.145	0.490	1.375
“out-of-plane” C-O bending vibration ν2	873	0.060	0.066	0.124	0.081
“in-plane” C-O bending vibration	710	0.017	0.011	0.060	0.045
PO43- stretching vibration ν3	1083	0.025	0.075	0.355	1.151
PO43- stretching vibration ν1	960	0.016	0.051	0.090	0.093
PO43- bending vibration ν4	562	0.015	0.014	0.069	0.090
PO4-3 bending vibration ν2	485	0.017	0.045	0.032	0.019
HPO4-2	767	0.011	0.005	0.066	0.019