Abstract
Abstract The growth of neodymium heptamolybdate crystals is described in the system Nd(NO3)3-MoO3-NH4OH-HNO3- Na2SiO3 using a single gel, single tube technique. The influence of pH, gel concentration and concentration of upper and lower reactants on the size, quality and nucleation density of the crystals is discussed. The techniques of concentration programming and seeded growth are used to enhance the crystal size. Factors influencing the formation of Liesegang rings during the growth are described. Both gel pH and temperature are observed to have a remarkable effect on Liesegang ring formation. The grown crystals are observed to exhibit varied morphology, for example platelets, cuboids, spherulites, crystal aggregates and coalesced crystals.
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