Estudio de la conductividad iónica de Li+ en compuestos con estructura tipo NZP

Resumen

The preparation of LiZr2(P04)3 by a ceramic method and by a gel route leads to two different phases both with NZP structure but different lattice parameters. The ionic conductivity of the pressed and sintered disks for the two phases, in the range of 25-400°C, reveals different conductivity mechanisms. For the sample prepared by gel-route, a change in the activation energy is observed (from 0,17 eV to 0,42 eV) between 150 and 200°C but for the sample prepared by ceramic method the activation energy of 0.19 eV in the whole interval studied. The ac conductivity at 400°C of sintered pellets is 3.85*10"^ (S/cm) for the sample prepared by gel-route and 2.28*10"^ (S/cm) for the sample prepared on the ceramic route. Two non-stoichiometric samples prepared by gel-route show both a new different behaviour. LiZr2(P042(OH)3 presents an activation energy of 0.45 eV and an ionic conductivity at 400°C of 1.01*10-4 (S/cm); while for LijZr^ 75(P04)3 the activation energy is 0.57 eV and its ionic conductivity at 400°C is 1.46*10-4 (S/cm