Structure and conductivity of acceptor doped La2BaZnO5 and Nd2BaZnO5
Journal article, 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.

SYSTEM

TRANSPORT

Mixed conductor

Physical

SOFC

PEROVSKITE

Impedance spectroscopy

ELECTROLYTES

ER

Oxide ion conductor

Chemistry

JOURNAL OF SOLID STATE CHEMISTRY

OXIDE-ION CONDUCTORS

Condensed Matter

Synthesis

1982

P176

HO

CHEL C

V42

Physics

DY

ND

Author

MD khairul Hoque

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

R. Haugsrud

University of Oslo

Christopher Knee

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Solid State Ionics

0167-2738 (ISSN)

Vol. 272 160-165

Subject Categories

Inorganic Chemistry

Driving Forces

Sustainable development

DOI

10.1016/j.ssi.2015.02.001

More information

Latest update

5/8/2018 6