Optically Active Crystal Vibrations of the Alkali-Metal Nitrates

Abstract

The infrared and Raman spectra for the three alkali-metal nitrates LiNo3, NaNO3, and KNO3 have been measured in the region from 1600 to 30 wavenumbers, and a normal-coordinate analysis has been made for these compounds with a special emphasis on the rotational and translational lattice modes in the crystal. All three compounds were studied as D3d6 models and a modified Urey–Bradley force field was used in the calculations. The intramolecular and interaction force constants for all three nitrates are given. The effect of the interaction potential constants on the NO3− ion is discussed as well as the effect of the metal ion–nitrate ionic interaction in the crystal from a comparison of the calculated force constants. Although there are large changes in the rotational and translational lattice frequencies when comparing one alkali-metal nitrate with another, the lack of force constant dependence is interesting.

Evaluation of the water sorption and controlled‐release potential of binary polymeric beads of starch and alginate loaded with potassium nitrate as an agrochemical

“…. 28 The previously mentioned bands were observed at wave numbers that were shifted a little bit, which confirmed the blend nature of the material as reported elsewhere. 29 …”

Selective synthesis on structures and morphologies of BixFeyOz nanomaterials with disparate magnetism through time control

“…This vibration is characteristic of octahedral FeO 6 groups in the perovskite compounds [28], thus proving the existence of FeO 3 3− . While the broad band at around 3400 cm −1 is attributed to the antisymmetric and symmetric stretching of bond H 2 O and OH groups, the band at 1632 cm −1 is corresponding to the bending vibrations of H 2 O [37,38], and the band at 1336 cm −1 is ascribed to NO 3 [39]. …”

Effect of Y-doping on optical properties of multiferroics BiFeO3 nanoparticles

“…The broad band at 3,000-3,600 cm -1 arose from the anti-symmetric and symmetric stretching of bond H 2 O and OH -1 groups, while a band at 1,700 cm -1 corresponded to the bending vibrations of H 2 O (Slamovich et al 1996;Li et al 1989). The band at around 1,390 cm -1 was due to the presence of trapped nitrates (Nakagawa and Walter 1969). The bands around 1,300 cm -1 possibly correspond to the formation of esters during the condensation reaction between ethylene glycol and maleic acid in the sol-formation process.…”