Effect of urea on metastable zone width, induction time and nucleation parameters of ammonium dihydrogen orthophosphate

Enhancement of the metastable zone width in ammonium dihydrogen ortho phosp hate (ADP) was achieved by the addition of the organic compound Urea to ADP solution. The metastable zone width studies were carried out for various t emperature cooling rates and the nucleation parameters are studied. The ind uction period was studied and the critical nucleation parameters calculated based on classical theory for homogeneous nucleation are discussed. The cr itical nucleation parameters increase with the increase in concentration of doping.