Electrical Properties, Defect Structures, and Ionic Conducting Mechanisms in Alkali Tungstate LiWO.

Discovery of new high-conductivity solid-state ionic conductors has been a long-lasting interest in the field of solid-state ionics for their important applications in solid-state electrochemical devices. Here, we report the mixed oxide-ion and Li-ion conductions, together with their conducting mechanisms in the LiWO material with triclinic symmetry. The process for the ionic identity is supported by several electrochemical measurements including electrochemical impedance spectroscopy, DC polarization, oxygen concentration cell, and theoretical analysis of neutron diffraction data and bond-valence-based energy landscape calculations.

Phase Evolution, Electrical Properties, and Conduction Mechanism of CaAlGaO (0 ≤ ≤ 14) Ceramics Synthesized by a Glass Crystallization Method.

Mayenite CaAlO, as an oxide-ion conductor, has the potential of being applied in many fields, such as solid-oxide fuel cells. However, its relatively low oxide-ion conductivity hinders its wide practical applications and thus needs to be further optimized. Herein, a new recently developed glass crystallization route was used to prepare a series of Ga-doped CaAlGaO (0 ≤ ≤ 14) materials, which is not accessible by the traditional solid-state reaction method.

Electrical properties of CaAlO synthesised through polymer assisted deposition and glass crystallization routes.

In this paper, two new methods, polymer assisted deposition (PAD) and glass crystallization (GC) methods were reported for the first time to prepare oxide ion conductor CaAlO, with their microstructures and electrical properties compared to that of a sample prepared by the traditional solid-state reaction (SSR) method. The results showed that these two new methods are effective for improving ceramic densities and oxide ion conductivities compared to the SSR method, and the ceramic prepared from the GC method in the present work possessed the highest level of ∼94% of the theoretical density and ∼1.0 × 10 S cm at 900 °C for the bulk conductivity.

Ga-doped CaAlO mayenite oxide ion conductors: synthesis, defects, and electrical properties.

Although mayenite CaAlO has been known as an oxygen ion conductor for several decades, its relatively low oxide ion conductivity limits its applications in electrochemical devices. Thus, many efforts have been made by researchers, employing a doping strategy, in order to further improve its ionic conductivity, but with little success. In this work, a series of pure phase CaAl Ga O (0 ≤ ≤ 1.