Synthesis and electrical properties of Li1+ x M x Ti2– x (PO4)3 (where M =Sc, Al, Fe, Y; x =0.3) superionic ceramics |
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| Authors: | Antonija Dindune Zaiga Kanepe Edvardas Kazakevi&#;ius Algimantas Ke&#;ionis Janis Ronis and Antanas Orliukas |
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| Institution: | (1) Institute of Inorganic Chemistry, Riga Technical University, Miera iela 34, 2169 Salaspils, Latvia,;(2) Department of Physics, Vilnius University, Saulėtekio al. 9, 2040 Vilnius, Lithuania, |
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| Abstract: | Compounds of the system Li1+
x
M
x
Ti2–
x
(PO4)3 (where M=Sc, Al, Fe, Y; x=0.3) were synthesized by a solid-state reaction and studied by X-ray diffraction. The ceramic samples were sintered and investigated
by complex impedance spectroscopy in the frequency range 106–1.2×109 Hz in the temperature range 300–600 K. Two relaxation dispersions related to the fast Li+ ion transport in bulk and grain boundaries were found. The activation energies of the bulk conductivity and relaxation frequency
were obtained from the slops of Arrhenius plots. The values of the activation energies of the bulk ionic conductivity and
relaxation frequency were found to be very similar in all the materials investigated. That can be attributed to the fact that
the temperature dependences of the bulk conductivity are caused only by the mobility of the fast Li+ ions, while the number of charge carriers remains constant with temperature.
Electronic Publication |
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| Keywords: | Solid electrolyte ceramics Fast ion transport Ionic conductivity |
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