Oxide ion conductivity in some substituted rare earth pyrozirconates

Preparation of double-doped BaCeO3and its application in the synthesis of ammonia at atmospheric pressure

“…The similarity of these microstructural features to those reported in Ref. [14] suggests that the enhancement in ionic conductivity in doped perovskitetype oxides could be attributed to improvements of both grain interior and grain boundary conductivities, by resolving the total conductivity into the grain interior and grain boundary contributions.…”

Influence of CaO on structure and electrical conductivity of pyrochlore-type Sm2Zr2O7

“…There have been some efforts to improve the conductivity of Gd 2 Zr 2 O 7 by substitution at the Gd site. Gd 2 Zr 2 O 7 doped with 5 and 10 mol% Sr at the Gd site had a higher total-conductivity than pure Gd 2 Zr 2 O 7 in the temperature range of 773-1023 K [13]. Mandal et al [14] prepared (Gd 1−x Nd x ) 2 Zr 2 O 7 (0 ≤ x ≤ 1.0) by a solid state reaction route, and found a significant enhancement of ionic conductivity in (Gd 0.5 Nd 0.5 ) 2 Zr 2 O 7 at 622-696 K. Electrical properties were investigated in a La substituted fluoriteGd 2 Zr 2 O 7 , and a peak in ionic conductivity was found for the (Gd 0.8 La 0.2 ) 2 Zr 2 O 7 at 1073 K [15].…”

Influence of MoO3 doping on structure and electrical conductivity of defect fluorite-type Gd2Zr2O7

“…van Dijk et al [15,16] prepared Gd x Zr 1−x O 2−x/2 (0.2 < x < 0.6) ceramics, * Corresponding author. and found that the stoichiometric Gd 2 Zr 2 O 7 had a maximum in ionic conductivity and a minimum in activation energy at temperatures between 773 and 1023 K. Gd 2 Zr 2 O 7 ceramics doped with different cations at A sites were widely investigated as potential solid electrolytes for SOFCs [17][18][19][20][21][22]. Gd 2 Zr 2 O 7 doped with 5 and 10 mol% Sr showed a higher electrical conductivity than undoped Gd 2 Zr 2 O 7 in the temperature range of 773-973 K [17].…”

“…and found that the stoichiometric Gd 2 Zr 2 O 7 had a maximum in ionic conductivity and a minimum in activation energy at temperatures between 773 and 1023 K. Gd 2 Zr 2 O 7 ceramics doped with different cations at A sites were widely investigated as potential solid electrolytes for SOFCs [17][18][19][20][21][22]. Gd 2 Zr 2 O 7 doped with 5 and 10 mol% Sr showed a higher electrical conductivity than undoped Gd 2 Zr 2 O 7 in the temperature range of 773-973 K [17]. A significant increase in electrical conductivity was found by suitable substitution of Sm or Nd at the Gd site in Gd 2 Zr 2 O 7 ceramic [18,19].…”