Concentration of WO3 Aqueous Effect on APT Crystal

The concentration of WO3 directly influences the over –saturation of the solution which has an important effect upon both the speed of nucleation and crystal growth. It is show that the higher the concentration of WO3, the larger the over-saturation of the solution, the smaller the APT crystal obtained. We have observed with microscope that the crystal obtained of WO3 has three shapes agglomerates of small cubic particles; needle crystals and tabular –like. This is because in the high over-saturation (NH4)2WO3 aqueous, the supply of APT solute for APT crystalline grains growing is uneven, so that on the active centers of the crystal-edges and the crystal pinpoints, there are more chances to receive APT solute for growing rapidly. Therefore, the needle crystals and tabular-like crystals are formed easily.

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