Oxygen diffusion in Mg-doped Sm and Gd zirconates with pyrochlore structure

The Gd2−xMgxZr2O7−x/2 Solid Solution: Ionic Conductivity and Chemical Stability in the Melt of LiCl-Li2O

“…The possibility of obtaining high-density ceramics is an important requirement for the electrochemical applications. The using of magnesium as a dopant for the compounds with the pyrochlore structure has been reported in the several studies [30][31][32][33][34], although the Mg 2+ -substituted solid solution based on Gd 2 Zr 2 O 7 has not been studied yet.…”

“…Mg 2+ -doped Sm and Gd zirconates with composition Sm 1.9 Mg 0.1 Zr 2 O 6.95 and Gd 1.9 Mg 0.1 Zr 2 O 6.95 were studied by V. Sadykov et al [34] in terms of their diffusion properties as promising materials for solid oxide fuel cells (SOFCs). It has been proven that the materials are oxide ionic conductors.…”

Structural and transport properties of Nd tungstates and their composites with Ni0.5Cu0.5O obtained by mechanical activation

“…6), the diffusion coefficient values along grain boundaries are close for the NWO and NLWO samples with high effective activation energy (Table 4). For the NWMO sample, the effective activation energy for the diffusion coefficient along grain boundaries is lower probably due to the difference in the W-O and Mo-O binding energy and/or the Mo cation effect on the extended defect features such as oxygen vacancy ordering or clustering, 29,30 thin secondary phase film segregation along grain boundaries [31][32][33] and the probable effect on the porous structure. 34 Within the frame of this model, the nonuniformity of the bulk oxygen mobility was revealed.…”

Effect of Li and Li-RE co-doping on structure, stability, optical and electrical properties of bismuth magnesium niobate pyrochlore

“…Materials with the pyrochlore-type structure (A 2 B 2 O 6 O', Fd3m space group), due to their chemical and structural diversity, can possess dielectric properties [1][2][3][4][5][6][7][8] and electronic [9][10][11][12], proton [11][12][13][14][15][16][17], and oxygen [18][19][20] types of conductivity varying in a broad range. These properties, in combination with the high thermal stability of the pyrochlore materials, make them suitable for various applications such as ceramic capacitors [3][4][5][6], electrodes or electrolytes in solid oxide fuel cells (SOFC) [20][21][22][23], sensors [23,24], energy storage materials [25], etc.…”

“…Additionally, the rare earth cation with a smaller ionic size promotes the formation of a conduction channel for oxygen ions of a larger diameter [15]. The oxygen transport usually is activated above 250 • C but displays the Arrhenius-type behavior lgσ = f (10 3 /T) above 360-400 • C [10,20,31]. The oxygen ion conductivity is caused by simultaneous oxygen migration through 48f-48f and 48f-8a sites [10,31].…”