What is NASICON material?

What is NASICON material?

NASICON is an acronym for sodium (Na) Super Ionic CONductor, which usually refers to a family of solids with the chemical formula Na1+xZr2SixP3−xO12, 0 < x < 3. NASICON compounds have high ionic conductivities, on the order of 10−3 S/cm, which rival those of liquid electrolytes.

What is NASICON structure?

The NASICON structure consists of a skeletal array of atoms which are stabilised by electrons, donated by alkali ions partially occupying sites in a three-dimensionally linked interstitial space [1]. The NASICON structure is said to be rhombohedral (R3c), except in the intervals 1.8 < x < 2.2 [8, 10].

What does NASICON stand for?

NASICON is an acronym for sodium superionic conductors of the general formula AnB2(PO4)3, where B is generally a TM ion or elements like Zr, Ge, Sn, etc. From: Structural Chemistry of Glasses, 2002.

A pure Na + super ion conductor (NASICON) phase is confirmed by X-ray diffraction (XRD) analysis, and its primary particle size is down to 70 nm by optimizing evaporation rate of the solvent.

How to synthesize Fe3+ based NASICON materials?

The Fe3+based NASICON materials were synthesized using citric acid: ethylene glycol mixture (CA:EG). The metal cations were complexed by citric acid (C6H8O7) and pH of the resultant solution is adjusted in the range 7-8 using ammonia solution.

What is a NASICON type ion conductor?

NASICON type ion conductors have been tested widely in energy applications for instance in electric vehicles. High ion conductivity and stability of phosphate units are advantages of NASICON over other electrolyte materials (Hong, 1976). Among the batteries those based on lithium show the best performance.

How do NASICON structures crystallize at high temperatures?

Generally, NASICON structures crystallize in thermally stable rhombohedral symmetry. But, members of A3M2(PO4)3family (where A=Li, Na and M=Cr, Fe) crystallize in monoclinic modification of Fe2(SO4)3-type structure and show reversible structural phase transitions at high temperatures (d’Yvoire et al.,1983).