Mechanisms of Ionic Conduction in Solid Electrolytes

Thin Films of Bismuth Vanadates with Modifiable Conduction Properties

“…An Arrhenius-like behavior is observed plotting ln[τ peak (s)] vs 1/T (Figure 8b). This phenomenon indicates that a thermally activated relaxation process occurs, 25,26 with an activation energy E a,τ ) 10.381 ( 2‚10 -3 kJ mol -1 . It is interesting to note that E a,τ is very close to the activation energy E a,σ determined by the conductivity Arrhenius plot.…”

Conductivity, Thermal Stability and Morphology of a New Z-IOPE Inorganic-Organic Network with the Formula [FexSny(CH3)2y(CN)zClv(C2nH4n+2On+1)Kl]

“…[16] Once again, the pseudo-activation energy for conduction of about 2 kJ N mol -1 , determined from the conductivity data (E a ) is quite similar to that determined from conductivity relaxation times (E peak ). Furthermore, the site relaxation energy height barrier (E s-r ) is 61.5% lower than the E a and E peak values (Table 2), thus proving that charge migration in the material is regulated mainly by segmental motion [31] and not by ion hopping processes between the sites present in the material [30,32,33] along the PEG 600 polyethereal chain (intrachain hopping) or between different chains (interchain hopping). It was reported [30] that conductivity due to ion hopping is "successful" when the "initial site relaxation rate" = 1/ s 2 = r s in the host material is higher than the "initial backhop rate" = 1/s* = r b of the ion.…”

“…[31] However, a limited contribution to the overall charge migration mechanism by ion hopping [30,32,33] between equivalent coordination sites is not to be excluded. Finally, owing to its conductivity of ca.…”

Self-Diffusion of Lithium in LiAlSi2O6 Glasses Studied Using Mass Spectrometry

“…In order to optimize the efficiency of such ion conductors, it is of considerable importance to identify the mechanisms which control the ionic transport in glass . Ionic mobility in different oxide glass systems has been intensively studied in the past, resulting in different, although often complementary, mechanistic models proposed. − Among these, a model to describe alkali-ionic transport through silicate glass network has been proposed by Greaves and Ngai according to which mobile alkali ions move through the structure by network hopping, i.e., places with lower Coulomb barrier facilitate alkali ion diffusion. To which extent such a model could realistically be applied to aluminosilicate glasses where Li is the only alkali present remains to be experimentally established.…”