Preparation of sodium zirconium phosphates of the type Na1+4xZr2−x (PO4)3
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Sodium zirconium phosphates of the type Na1+4x Zr2-x (PO4)3 were prepared from mixtures of Na3PO4-ZrO2-ZrP2O7 in sealed platinum tubes at temperatures of 900 - 1200°C. Stoichiometric NaZr2 (PO4)3 (x = 0) was found not to exist. Instead, a solid solution in the range x = 0.02 - 0.06 was found, with a slight difference in unit cell dimensions obtained. A second solid solution region was found with x = 0.88 - 0.93. At still higher values of x, a stoichiometric phase with hexagonal unit cell dimensions of a = 9.152(1) A ̊ and c = 21.844(1) A ̊ was obtained. Finally a phase of composition Na7Zr0.5 (PO4)3 was synthesized at the highest values of x. Attempts to prepare Na5+x ZrSix-P3-xO12 always yielded NASICON and Na7Zr0.5 (PO4)3. © 1983.
author list (cited authors)
Clearfield, A., Guerra, R., Oskarsson, A., Subramanian, M. A., & Wang, W.