Ga-doped Ca₁₂Al₁₄O₃₃mayenite oxide ion conductors: synthesis, defects, and electrical properties

Abstract

The bulk conductivity of Ca12Al14O33 can be apparently enhanced by Ga-doping on the Al sites.

Electrical properties of Ca12Al14O33synthesised through polymer assisted deposition and glass crystallization routes

“…[21][22][23] Nevertheless, its relatively low cost of raw materials makes it still competitive if the oxide ion conductivity could be improved. To this end, several works using a cation doping strategy have been carried out, such as zinc single doping or zinc and phosphorus co-doping, 24,25 irondoping, 26 cobalt-doping, 27 gallium-doping, 28 and vanadiumdoping 29 on Al atom sites. For the zinc-, phosphorus-, or irondoped materials, an even lower conductivity was observed when compared to that of parent Ca 12 Al 14 O 33 .…”

Electrical Properties, Defect Structures, and Ionic Conducting Mechanisms in Alkali Tungstate Li2W2O7

“…Conventional solid-state oxide-ion conductors are primarily found in crystalline oxides with high crystallographic symmetries and oxygen vacancies or interstitials as mobile lattice defects, representatives of which with oxygen vacancies are fluorite-structured yttria-stabilized zirconia (YSZ) and perovskite-structured strontium and magnesium co-doped LaGaO 3 (LSGM). − Those with oxygen interstitials have been found in apatite-structured materials, − melilite-structured materials, − and, more recently, reported Ba 7 Nb 4 MoO 20 -based hexagonal perovskite-related oxides …”

Phase Evolution, Electrical Properties, and Conduction Mechanism of Ca12Al14–xGaxO33 (0 ≤ x ≤ 14) Ceramics Synthesized by a Glass Crystallization Method

“…Among these new structural families, the mayenite Ca 12 Al 14 O 33 material demonstrates the lowest oxide-ion conductivity, even inferior to that of YSZ at a given temperature. − Nevertheless, its relatively low cost of raw materials makes it still competitive if the oxide-ion conductivity could be improved. To this end, several works using a cation doping strategy have been carried out, such as zinc single doping or zinc and phosphorus codoping, , iron doping, cobalt doping, gallium doping, and vanadium doping on Al atom sites. While the zinc-, phosphorus-, or iron-doped materials exhibit even lower conductivities to that observed for the parent Ca 12 Al 14 O 33 , the cobalt-, gallium-, and vanadium-doped samples, possess slightly improved conductivities, even though the narrow solid solution hindered their further conductivity enhancements.…”