New Oxygen-Deficient Perovskite La(Al0.5Zn0.5)O2.75: Synthesis, Structure, and Transport Properties

The solid-phase synthesis of oxygen-deficient perovskite La(Al0.5Zn0.5)O-2.75 is performed for the first time. The perovskite crystallizes in space group Pm3m with a lattice parameter of 3.7932 angstrom. The cationic composition of the phase is confirmed via chemical analysis. It is shown that lanthanum alumina zincate has a mixed type of conductivity in the region of high oxygen partial pressures and temperatures above 500 degrees C, while oxygen-ion transport predominates at temperatures below 400 degrees C. Introducing zinc into the B-sublattice of perovskite allows high-density ceramics (>95%) to be obtained.