Wavenumbers, cm^–1 for sample (1)

Wavenumbers, cm^–1 for sample (2)

Wavenumbers, cm^–1 for sample (3)

Type of Vibration

3697.84 cm⁻¹

3696.87 cm⁻¹

3696.87 cm⁻¹

C-H bond stretching (symmetric and asymmetric) (-CH₂ and CH₃)

3620.7 cm⁻¹

3620.7 cm⁻¹

3619.73 cm⁻¹

C-H bond stretching (symmetric and asymmetric) (-CH₂ and CH₃)

3426.89 cm⁻¹

3422.06 cm⁻¹

3420.14 cm⁻¹

The broad band around 3354 cm⁻¹ can be assigned to O-H and N-H stretching

1636.3 cm⁻¹

1637.27 cm⁻¹

1636.3 cm⁻¹

C=C band

1031.1 cm⁻¹

1031.7 cm⁻¹

1033.66 cm⁻¹

Corresponds to the production of silanol groups (Si-OH stretch) or SiO₂ impurity

912.165 cm⁻¹

912.165 cm⁻¹

Al-OH bending vibration

796.457 cm⁻¹

Which might be attributed to the intense twinning

673.035 cm⁻¹

Si-O symmetrical bending vibration

535.15 cm⁻¹

534.19 cm⁻¹

536.114 cm⁻¹

Si-O-Al stretching

470.55 cm⁻¹

470.55 cm⁻¹

468.687 cm⁻¹

Si-O asymmetrical bending vibration