Table 2. Characteristic transmittance infrared bands of Zr-HAP with different concentrations of zirconia.

x = 0.0	x = 0.2	x = 0.4	x = 0.6	x = 0.8	x = 1.0	Assignment	References
—	427.5	—	—	—	—	Zr–O stretching mode	28
447.5	—	—	—	—	443.2	ν2 bending mode PO43− ions	35,41
—	—	—	—	—	461	Zr-O stretching mode	37
467.9	466.7	468	468.4	468	467.7	ν2 Vibration O–P–O	33,38
—	—	—	—	—	525.1	Zr–O stretching mode	28
562.8	563.3	563.4	562.4	563.97	563.3	ν4 bending mode of O–P–O	33
602.5	602.9	603	602.8	603.3	602.2	ν4 bending mode of O–P–O mode	33,34
874	874.4	874	873.4	873.5	872	ν2 of vibrations of CO32−	33
1030.3	1031.3	1031.8	1031.5	1031.6	1031.6	ν3 anti-symmetric stretch of PO43−	34,35,42
1421.8	1422.98	1421.7	1423.2	1423	1421.7	ν3 of CO32− ion	33,38
1453.7	—	—	—	—	—	Vibrations of CO32−	33,38
1632.1	1642.96	1640.6	1633.5	1634.1	1631.1	Absorbed water	43
3434.8	3434.96	3437.8	3439.4	3434.7	3428.4	The vibrations of OH−	35,43,45