Hydrothermal and solid state synthesis of sodium zirconium silicophosphates
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Nasicon has been prepared hydrothermally from zirconium phosphate, Zr(HPO4)2·H2O, and Na4SiO4 in excess NaOH at 300°C. If the excess NaOH is omitted a pre-cursor phase forms which on heating to 1200°C yiels Nasicon. In its hydrated form Nasicon is hexagonal but on dehydration reverts to monoclinic. The triphosphate, NaZr2((PO4)3, is part of a solid solution system, Na1+4xZr2-x(PO4)3 with 1 > x > 0.12. This implies that the sodium zirconium silicophosphates may also exist in zirconium deficient form. © 1981.
author list (cited authors)
Clearfield, A., Jerus, P., & Cotman, R. N.