Table 2.

FT-IR analysis of the (Ho_1-xLa_x)₂O₃ nanopowder.

Maximum of absorption band, cm−1	Assignments [41]
3700–3000	OH− stretch
1650–1630	H–O–H bend (ν2)
1515	CO32− ν3 asymmetric stretch
1398	CO32− ν3 symmetric stretch
1384 (narrow)	NO3− symmetric stretch
1077	CO32− ν1 symmetric stretch
847	CO32− ν2 out-of-plane deformation
556	Ho–O lattice vibration