Modelling and characterization of mixed ionic-electronic conduction in Gd2(Ti1 − xMnx)2O7 + y

Sol–gel synthesis, structure characterization and Raman spectroscopy of Gd2−2xBi2xTi2O7 solid solutions

“…Preparing sample by traditional solid-state reaction from a mixture of oxides (Gd 2 O 3 and TiO 2 ) generally requires repeat grinding and long firing cycles at temperatures higher than 1200 • C to achieve complete reaction. Recently, Tuller et al [20,21] reported oxide-ionic conductivity in Gd 2 Ti 2 O 7 pyrochlore, showing approximately 6.3 × 10 −4 S/cm at 1000 • C in air, and that A-and B-site doping improves the electrical property of stoichiometric Gd 2 Ti 2 O 7 . Sintering characteristics of the pyrochlores where promoted by A site deficiency.…”

Effect of ceria on properties of yttrium-doped strontium titanate ceramics

“…Measurements were made in flowing methane (5.5% in Ar) saturated with H 2 Oat308C at a rate of 30 cm 3 /min. The heating rate was 10 8C/min.…”

“…The electrical properties of oxides may be tailored by control of the composition and oxygen partial pressure [2]. This has been shown for fluorites, perovskites, and more complex structures [3][4][5]. The specific set of requirements which should be satisfied to optimize the behavior of oxide anodes includes good electronic and ionic conductivity, thermal stability over a rather wide range of oxygen partial pressure, sufficient catalytic activity, compatibility with solid electrolyte and other SOFC components, etc.…”

Cation size effects in oxygen ion dynamics of highly disordered pyrochlore-type ionic conductors

“…[1][2][3] Combining different A and B cation pairs, pyrochlores electrical behavior span from that typical of insulators or semiconductors to materials showing high ionic, electronic, or mixed conductivity. [4][5][6] The ideal pyrochlore cubic crystal structure ͑S.G. 227͒ might be derived from that of an anion deficient fluorite by doubling the unit cell, removing one out of every eight anions, and placing cations and anions in four crystallographically nonequivalent sites.…”