T. Rajalakshmi et al., CHARACTERIZATION OF UREA SINGLE-CRYSTALS, Materials science & engineering. B, Solid-state materials for advanced technology, 39(2), 1996, pp. 111-115
The electro-optic coefficients were measured using a sensitive modulat
ion technique for urea single crystals. IR and Raman studies have been
carried out to identify the molecules NH2, NCN and C=O vibrational fr
equencies. The dielectic measurements have been made using the bridge
method. It is found that the dielectric constant and dielectric loss d
ecrease with increasing frequency.