50 mol% indium substituted BaTiO3: Characterization of structure and conductivity
Journal article, 2012

BaTi0.5In0.5O3-delta was prepared by solid state reaction at 1400 degrees C. Rietveld analysis of high resolution X-ray powder diffraction data indicated phase pure as-prepared material that adopts a cubic perovskite structure with a = 4.1536(1) angstrom. Thermogravimetric analysis revealed the presence of significant levels of protons in the as-prepared material and 57% of the theoretically achievable protonation was attained on exposure to a humid environment at 185 degrees C. After hydration the cell parameter increased to 4.1623(1) angstrom. Electrical conductivity was measured both with fixed and variable frequency ac impedance methods as a function of temperature, oxygen-, water vapour- and heavy water vapour partial pressures. In the temperature range 400-800 degrees C a slight increase in the total conductivity with increasing oxygen partial pressure is encountered, characteristic of a contribution from p-type charge carriers. The effect of the water vapour pressure on conductivity below 600 degrees C is much more prominent indicative of dominant proton conduction. At 300 degrees C the total conductivity in wet O-2 was estimated to be 9.30 x 10(-5) S/cm. At T > 800 degrees C the material is a pure oxide ion conductor.

ba2in2o5-rectangle

baceo3

Proton conductivity

Perovskite

X-ray diffraction

quantum molecular-dynamics

oxides

temperature protonic conductors

perovskites

bazro3

Barium titanate

transport

Brownmillerite

Impedance

hydrogen

Author

Seikh Mohammad Habibur Rahman

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Christopher Knee

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Istaq Ahmed

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Sten Eriksson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

R. Haugsrud

University of Oslo

International Journal of Hydrogen Energy

0360-3199 (ISSN)

Vol. 37 9 7975-7982

Subject Categories

Chemical Sciences

DOI

10.1016/j.ijhydene.2011.12.139

More information

Latest update

5/8/2018 6