Elaboration and Physico-Chemical Characterizations of the Series of Nanomaterials: Lithium-Substituted NASICONS with General Formula Li3.2Zr2-y Si2.2–4y P0.8+4y O12 where (0 ≤ y ≤ 0.55)

The series of nanomaterials: lithium-substituted NASICONS with general formula Li3.2Zr2-ySi2.2–4y P0.8+4y O12 where 0 ≤ y ≤ 0.55, was synthesized by the sol-gel method which consisted in calcining the preliminary precursors at temperatures higher than their crystallization temperatures. The dried powders, at 373 K, of the five preliminary precursors were analyzed by coupled DTA-TGA in order to determine their crystallization temperatures and therefore leading to the estimation of their calcined temperatures. The calcined powders have been characterized by physico-chemical techniques: XRD and CIS. The XRD analyses show the obtaining of only the single phase without any detection of other phases as: ZrO2, SiO2, Li2O, ZrSiO4, Li3PO4, Li2SiO3 or Li2ZrO3, according to their JCPDS file cards and suggest that the decrease in the zirconium concentration does not modify the stability of the lithium-substituted NASICONS, whereas the complex impedance spectroscopy results have highlighted the best total electric conductivity for y value equal to 0.55.