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Single crystals of Gadolinium Samarium Oxalate (GSO) are grown by gel method. The crystals are pale yellowish in colour. Morphology and size of the crystals are found to depend on pH of the medium, gel density, concentration of the reactants and acidity of the feed solution. The crystallinity of the grown sample was confirmed by X-ray diffraction studies and the lattice parameters were determined. X-ray diffractogram shows well defined peaks. IR spectrum confirms the presence of water molecules and carboxylic group. EDAX analysis confirms the presence of Gd and Sm in the sample. The thermal decomposition behaviour of the crystal was analysed using TGA and DTA studies.

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Jnfluence of different parameters like concentration of the outer electrolyte, age of the gel and impurities added to the outer electrolyte on the periodic precipitation of lead carbonate crystals in silica gel are presented. Increase of outer electrolyte concentration has the effect of increasing z2/t value while it decreases with increase of the gel age. Impurities added to the outer electrolyte delay the time of formation of the rings. All these observed results are explained.