Effect of Synthesis Procedure on the Structure of Sodium Zirconium Silicophosphates
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Sol‐gel, hydrothermal, and classical high‐temperature solid‐state synthesis techniques were used to prepare stoichiometric and nonstoichiometric phases in the nasicon system, Na1+xZr2SixP3‐xO12. The results of neutron and X‐ray powder data were used to explain the stoichiometry and structure of nasicon. These results suggest that the formation of nasicon is path‐dependent. The results of the sol‐gel preparations confirmed that stoichiometric nasicon can be formed but is unstable. There are definite structural differences among the products prepared by different techniques, with the sol‐gel products having the more ordered structures. The formula Na1+4y+xZr2‐y‐zSixP3‐xO12‐2Zis proposed to account for the observed stoichiometry. Significant differences are evident in the room‐temperature conductivities as well as in the low‐temperature (25° to 180°C) activation energies for the conduction process. However, above 180°C both the slopes of the log σversus 1/T lines and the conductivities are very similar. 1987 The American Ceramic Society
author list (cited authors)
MOINI, A., & CLEARFIELD, A.