Synthesis, Structure and Electrical Properties of NASICON (LiSn2-xTix(PO4) (x = 0.4) Ceramic

Abstract

LiSn1.6Ti0.4(PO4) ceramic powder was synthesized via solid state reaction and investigated for electrical and dielectric properties for use as solid electrolyte. X-ray diffraction shows that rhombohedral R¯3 c NASICON-type structure with unreacted phase of SnO2. Impedance study in the temperature range 300 to740 K and frequency range 300 kHz - 3 GHz were carried out together with dielectric permittivity studies under the same condition. The determined bulk grain boundary conductivities are 1.39×10^1 S⁄(cm and 3.39×10^(-4) ) S⁄(cm at 740 K respectively) while their corresponding room temperature conductivities are 6.31×10^(-6) S⁄(cm and 1.72×10^(-6) ) S⁄(cm respectively.) Activation energies determined from Arrhenius plot are 0.67 eV and 0.78 eV for bulk and grain boundary,respectively. The dielectric constant E^1 has a values for NASICON and indicate that 〖LiSn〗_1.6 〖Ti〗_0.4 (〖PO〗_4 ) could be a promising candidate for application as solid electrolyte at elevated temperatures.