Abstract
Crystalline samples of α-zirconium phosphate, (α-ZrP, α-Zr(HPO4)2·H2O) have been prepared by decomposition of zirconium fluoride complexes in the presence of phosphoric acid under a variety of conditions. The crystallinity and morphology have been shown to depend on a number of factors including the F−/Zr4+ ratio, the concentration of Zr4+ ions, the material of the reaction vessel and the reaction temperature. Under conditions of rapid precipitation small plate-like crystals of α-ZrP are produced whereas under conditions of slow crystallisation larger crystals with a lower aspect ratio are formed. The relative intensities of the d002, d110 and d112 reflections observed by X-ray powder diffraction show a correlation with the crystal morphology as determined by SEM.
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