Urea is an attractive material for frequency conversion of high power lasers to UV but the
frequent use of urea (U) crystal at normal atmosphere is troublesome due to its hygroscopic
nature. The hygroscopic character of urea has been modified by making the solid solution
with m-dinitrobenzene (DNB). The phase diagram of DNB and U shows the formation of a
monotectic and a eutectic. There is also a large region of immiscibility, where two immiscible
liquid phases are in equilibrium with a liquid of single phase. The solubility of U, DNB and …