Structure and conductivity of acceptor doped La2BaZnO5 and Nd2BaZnO5
Artikel i vetenskaplig tidskrift, 2015

The effect of calcium substitution on the structure and electrical conductivity of Ln(2 - x)Ca(x)BaZnO(5 - delta), Ln = La and Nd, has been studied. Differing trends with respect to dependence of the unit cell volume were observed as a function of Ca substitution. For both series of materials the limit of Ca substitution was estimated to be x approximate to 0.2. The electrical conductivity was studied in the temperature range of 1000-350 degrees C using electrochemical impedance spectroscopy in argon and oxygen atmospheres and via isotherms between 400 and 1000 degrees C as function of oxygen pressure and the water vapour pressure. A marked increase in conductivity of approx. two orders of magnitude was explained by the presence of oxygen vacancies in the calcium doped samples. At pO(2) < 10(-12) atm atm the x = 0.15 materials are predominantly oxygen ion conductors, and La1.85Ca0.15BaZnO5 - delta displays a peak conductivity of 0.002 S cm(-1) at 1000 degrees C. The materials display a rise in conductivity in oxidizing conditions, indicating a significant p-type contribution.

DY

Mixed conductor

Oxide ion conductor

SOFC

SYSTEM

Physical

P176

CHEL C

TRANSPORT

HO

Synthesis

V42

ND

ER

Condensed Matter

1982

Impedance spectroscopy

JOURNAL OF SOLID STATE CHEMISTRY

Chemistry

Physics

OXIDE-ION CONDUCTORS

ELECTROLYTES

PEROVSKITE

Författare

MD khairul Hoque

Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

R. Haugsrud

Universitetet i Oslo

Christopher Knee

Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Solid State Ionics

0167-2738 (ISSN)

Vol. 272 160-165

Ämneskategorier

Oorganisk kemi

Drivkrafter

Hållbar utveckling

DOI

10.1016/j.ssi.2015.02.001