Structural and Electrochemical Properties of Lanthanum Silicate Apatites La₁₀Si_6−x−0.2Al_xZn_0.2O_27−δ for Solid Oxide Fuel Cells (SOFCs)

Table 3

Comparison of activation energy E_a and preexponential factor k of La₁₀Si_6−x−0.2Al_xZn_0.2O_27−δ (x = 0.2 and 0.4) with literatures.

	La10Si5.4Al0.4Zn0.2O26.6 (this work)	La10Si5.6Al0.2Zn0.2O26.7 (this work)	La9.6Si5.7Mg0.3O26.1 [44]	La10(SiO4)6O3 [39]	La10Si6O27 [70]	La9.50Si6O26.25 [70]
Activation energy, (eV)	0.35	0.30	0.43	0.65 ± 0.1	0.67	0.35
Preexponential factor, k (Skcm^−1)	18281	10216	—	—	—	—