The Vibrational Spectroscopy of the Valence Bonds of Cu-Doped TiO₂ Using Electronegativity Principle Quantitative Calculations

Table 5

Infrared spectra of the 2.5 mol%Cu-doped TiO₂ samples with the content and vibrational frequency of valence bonds.

The type of bond	Content (%)	Vibrational frequency (cm^−1)
TiA-O	21.23	1574.6, 1114.3, 666.94, 623.11, 574.02, 541.21, 509.79, and 458.99
TiR-O	18.56	1537.9, 1503.3, 1458.5, 1394.74, 848.4, 796.48, 748.65, and 710.29
H-O	7.34	1680.9 and 1633.4
Cu^iA-O	0.98	488.74
Cu^iR-O	1.34	609.31