EFFECT OF SYNTHESIS PROCEDURE ON THE STRUCTURE OF SODIUM ZIRCONIUM SILICOPHOSPHATES

Solgel, hydrothermal, and classical hightemperature solidstate synthesis techniques were used to prepare stoichiometric and nonstoichiometric phases in the nasicon system, Na1+xZr2SixP3xO12. The results of neutron and Xray powder data were used to explain the stoichiometry and structure of nasicon. These results suggest that the formation of nasicon is pathdependent. The results of the solgel 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 solgel products having the more ordered structures. The formula Na1+4y+xZr2yzSixP3xO122Zis proposed to account for the observed stoichiometry. Significant differences are evident in the roomtemperature conductivities as well as in the lowtemperature (25 to 180C) activation energies for the conduction process. However, above 180C both the slopes of the log versus 1/T lines and the conductivities are very similar. 1987 The American Ceramic Society

EFFECT OF SYNTHESIS PROCEDURE ON THE STRUCTURE OF SODIUM ZIRCONIUM SILICOPHOSPHATES Academic Article