Abstract
Growth aspects of pure and Calcium doped Zinc hydrogen phosphate single crystals from silica gel by the process of single diffusion technique are discussed. Crystals with different morphologies and effect on various parameters like gel pH, and gel ageing, gel density and concentration of reactants on the growth of pure and Calcium doped ZnHPO 4 crystals were studied. Laser Raman spectra of the pure and Calcium doped ZnHPO 4 crystals are recorded and the vibrational assignments have been made with possible explanations. Thermo gravimetrical analysis is undertaken to study the thermal stability of the grown crystals. The photoluminescence measurement shows that the material is suitable for photonic devices. The crystals grown were characterized by Laser Raman spectrum, TG/DTA, EDAX and Photoluminescence.
Highlights
Single crystals are the backbone of the modern technological revolution
The supernatant solutions of Zn (NO3) 2.6H2O (Zinc Nitrate – AR Grade) and Ca(NO3) 2.4H2O (Calcium Nitrate – AR Grade) at a required mole solution was slowly added along the walls of the test tubes over the set goals and tightly closed to prevent evaporation
Synthesis of pure zinc hydrogen phosphate (ZnHPO4) and calcium doped ZnHPO4 crystals in the form of single crystal were achieved by single diffusion technique at room temperature
Summary
The art of growing crystals in silica gel medium is not new for researchers because of its simplicity, low cost and crystals can be grown at room temperature. The principle relies on the slow migration of crystal constituents (ions) through silica gel so that a very slow reaction occurs with the formation of a sparingly soluble compound. When the concentration of this compound exceeds the solubility limits, crystals will be formed, the main function of the silica gel being to control the flow of reacting ions [1-5]. 8 hrs 12 hrs 24 hrs pH = 5 – poly crystals pH = 6 – good needle & platelet pH = 7 – 2x3mm single Lissegang rings form diffusion technique at room temperature. The following expected reaction takes place in the growth columns and growth procedure is listed in the Tables 1 & 2
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