Promising LaMoO-LaMoO Composite Oxygen-Ionic Electrolytes: Interphase Phenomena.

The LaMoO-LaMoO composite materials represent a novel class of highly conductive materials demonstrating increased oxygen-ion conductivity. Extensive research of (100 - )LaMoO-LaMoO composites over a wide range of concentrations ( = 5, 10, 15, 20, 30, and 100) was carried out for the first time. An increase in conductivity, oxygen surface exchange coefficient, and oxygen diffusivity is observed for composites compared to individual oxides, which is associated with the segregation of different ions on the surface of the grains and the formation of a LaMoO new phase at the contact boundary of LaMoO and LaMoO.

Correlation between structure, surface defect chemistry and O/O exchange for LaMoO and La(MoO).

The LaMoO and La(MoO) powders were synthesized using a solid-state reaction method and used to prepare dense ceramics. X-ray photoelectron spectroscopy was used to study the chemical composition and charge numbers of the elements in the subsurface area of dense ceramics of lanthanum molybdates. The spectra were measured under an ultra-high vacuum of 7 × 10 atm at 30 °C and 600 °C, and under an oxygen atmosphere at 2 × 10 atm at 600 °C and 825 °C.