THE USE OF HYDROTHERMAL PROCEDURES TO SYNTHESIZE NASICON AND SOME COMMENTS ON THE STOICHIOMETRY OF NASICON PHASES
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NASICON was prepared by a two step process. In the first step zirconium phosphate an Na4SiO4 are treated hydrothermally at 300C. This produced a hydrated phase with approximate composition Na4Zr2Si2.25P1.8O15H2O which could be indexed on the basis of an orthorhombic cell with a=8.743(1), b=10.317(4), c=7.317(1) A . Upon heating this orthorhombic phase to 1100C, P2O5 splits out to yield monoclinic NASICON of composition Na3.3Zr1.65Si1.9P1.1O11.5. This formula reflects both a deficiency of ZrO2 and Zr4+, compensated by Na+ for charge balance, over that required by Na1+xZrx2SixP3-xO12. It is proposed that both a NASICON series of the latter type and the defect type described in this paper exist, with the stoichiometric one being unstable and regarding to the defect structure upon heating. 1983.
author list (cited authors)
CLEARFIELD, A., SUBRAMANIAN, M. A., WANG, W., & JERUS, P.
complete list of authors
CLEARFIELD, A||SUBRAMANIAN, MA||WANG, W||JERUS, P