Effect of synthesis procedure on the structure of sodium zirconium silicophosphates

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1987.tb00075.x· OSTI ID:6173780

Moini, A; Clearfield, A ^[1]

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1. Texas A and M Univ., College Station (USA)

Sol-gel, hydrothermal, and classical high-temperature solid-state synthesis techniques were used to prepare stoichiometric and nonstoichiometric phases in the nasicon system, Na{sub 1+x}Zr{sub 2}Si{sub x}P{sub 3{minus}x}O{sub 12}. 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 Na{sub 1+4y+x}Zr{sub 2{minus}y{minus}z}Si{sub x}P{sub 3{minus}x}O{sub 12{minus}2z} is proposed to account for the observed stoichiometry. Significant differences are evident in the room-temperature conductivities as well as in the low-temperature (25{degree} to 180{degree}C) activation energies for the conduction process. However, above 180{degree}C both the slopes of the log {sigma} versus 1/T lines and the conductivities are very similar.

• OSTI ID: 6173780
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 2:2; ISSN ACEME; ISSN 0883-5551
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
HYDROTHERMAL SYNTHESIS
INFORMATION
MEDIUM TEMPERATURE
MICROSTRUCTURE
NEUTRON DIFFRACTION
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SILICON PHOSPHATES
SODIUM COMPOUNDS
SODIUM PHOSPHATES
SOL-GEL PROCESS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM PHOSPHATES