Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route

Effect of zinc doping on electrical properties of LaAlO3 perovskite

“…S5a). The capacity calculated for this semicircle correlated well with the data presented in [11], where the same second semicircle was assigned to the grain boundary response too. The evolution of impedance spectra for different temperature ranges is shown in Fig.…”

“…We can assume that this semicircle corresponds to a bulk response. We made this conclusion on the basis of the comparison with the data, presented in [11], since in many respects we have similar results : i) the average grain size of LaAlO 3 was found to be ~1 μm ; ii) the capacitance for high-frequency semicircle is determined to be ∼10 −11 F/cm ; iii) the values of the conductivity of the undoped samples agree well (Fig. 4b).…”

“…But in some studies, the cubic structure was stabilized at room temperature. A cubic modification was obtained by the mechanochemical [11] and the Pechini methods [15]. The morphology of the sample was investigated using scanning electron microscopy (SEM).…”

“…The modification of compounds with the general formula of A 3+ B 3+ O 3 is the most simple implementation of this approach [6][7][8][9]. The lanthanum aluminate LaAlO 3 (LAO) can be a promising perovskite material in this trend due to its high chemical stability [10][11][12][13]. The systems based on LaAlO 3 can be good ionic or mixed conductors by adding suitable dopants [12].…”

“…The possibility of introducing various dopants into the La 3+ or Al 3+ −sublattices of LaAlO 3 has been proven in several works. The substitutions of lanthanum by alkaline-earth elements (Ca, Sr, Ba) [7,11,14,15], aluminum by magnesium [7,15,16], and simultaneous cosubstitutions into both sublattices [7][8][9]12,13,15,16] have been made. Thus, it was shown that the acceptor doping of LaAlO 3 produces a deficiency in the oxygen sublattice and, respectively, induces oxygen-ionic transport.…”