Oxide ion conductivity of double doped lanthanum gallate perovskite type oxide

ABSTRACTAn La1-xSrxGa1-y-zMgyCozO3-(x+y+z)/2 (LSGMCO) has attracted much attention because it can be useable as an electrolyte of a solid oxide fuel cell due to its high oxide ion conductivity. We prepared LSGMCO thin films on silica glass and LaAlO3 single crystal substrates by pulsed laser deposition and evaluated their properties. LSGMCO thin films deposited at 800°C were poly-crystal and the deposition pressure affected their surface morphologies. In the case of the LaAlO3 single crystal substrate, a c-axis oriented LSGMCO thin film was obtained. DC conductivity and complex impedance of LSGMCO thin films were measured in vacuum atmosphere to investigate the effect of the crystal orientation on the oxide ion conductivity. It was revealed that resistance at a grain boundary of films is more dominant compare with the grain interior.

Download Full-text

Oxide ion conductivity in perovskite type Sr2ScAlO5 and related compounds

Solid State Ionics ◽

10.1016/0167-2738(92)90250-s ◽

1992 ◽

Vol 53-56 ◽

pp. 748-753 ◽

Cited By ~ 6

Author(s):

Y. Takeda ◽

N. Imanishi ◽

R. Kanno ◽

T. Mizuno ◽

H. Higuchi ◽

...

Keyword(s):

Ion Conductivity ◽

Oxide Ion Conductivity ◽

Related Compounds ◽

Perovskite Type ◽

Oxide Ion

Download Full-text

Oxide-ion conductivity of the perovskite-type solid-solution system, (Ba1−x−ySrxLay)2In2O5+y

Solid State Ionics ◽

10.1016/s0167-2738(02)00495-2 ◽

2002 ◽

Vol 154-155 ◽

pp. 571-576 ◽

Cited By ~ 41

Author(s):

K Kakinuma

Keyword(s):

Solid Solution ◽

Ion Conductivity ◽

Solution System ◽

Oxide Ion Conductivity ◽

Solid Solution System ◽

Perovskite Type ◽

Oxide Ion

Download Full-text

High Oxide Ion Conductivity of (Ba1-x-ySrxLay)InO2.5+y/2 Members Derived from the Ba2In2O5 System

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.242-244.159 ◽

2005 ◽

Vol 242-244 ◽

pp. 159-168 ◽

Cited By ~ 1

Author(s):

Katsuyoshi Kakinuma ◽

Hiroshi Yamamura ◽

Tooru Atake

Keyword(s):

Ion Mobility ◽

Ion Conductivity ◽

Ion Conductor ◽

Oxide Ion Conductor ◽

Oxide Ion Conductivity ◽

Maximum Value ◽

Solid Solution System ◽

Perovskite Type ◽

Oxide Ion ◽

Key Parameter

We have discovered a high oxide ion conductor within the perovskite-type (Ba1-x-ySrxLay)InO2.5+y/2 solid-solution system. The system was derived from brownmillerite-type Ba2In2O5, which possessed a ordered oxide ion vacancies. When we doped La3+ into the Ba site, the vacancy changed to a disordered state. The oxide ion conductivity increased with the amount of doped La3+, reaching a maximum value of 0.12 (S/cm) at 800 oC in (Ba0.3Sr0.2La0.5)InO2.75, a level exceeding that of yttria-stabilized zirconia. The oxide ion conductivity of this system was strongly dependent on the unit cell free volume, which appears to be the key parameter governing oxide ion mobility.

Download Full-text

Ionic Conductivity Study on the New High Oxide Conducting Perovskite LaGaO3

MRS Proceedings ◽

10.1557/proc-527-503 ◽

1998 ◽

Vol 527 ◽

Author(s):

G.V.M. Kiruthika ◽

U.V. Varadaraju

Keyword(s):

Activation Energy ◽

Ionic Conductivity ◽

Single Phase ◽

Ion Conductivity ◽

Lanthanum Gallate ◽

Migration Energy ◽

Ion Migration ◽

Oxide Ion Conductivity ◽

Unit Cell Size ◽

Oxide Ion

ABSTRACTOxide ion conductivity studies have been done on the Lanthanum Gallate based compounds. Yttrium substitution at the Ga site has been attempted to increase the unit cell size. Single phase was obtained for limited Y substituion i.e., La0.9Sr0.1Ga0.7Y0.1Mg0.2O3-x. It is found that the activation energy for the oxide ion conductivity has decreased for this composition. Based on the tolerance factor and B-site radius values, the migration energies were obtained for the LaGaO3 based perovskites. It is observed that migration energy has been significantly reduced upon substitution at the B-site. Absence of an enhancement in the conductivity with Yttrium substitution could be due to the vaccancy ordering inhibiting the oxide ion migration.

Download Full-text