Synthesis and structural characterization of perovskite type proton conducting BaZr1−xInxO3−δ (0.0 ≤ x ≤ 0.75)
Journal article, 2006

Solid state sintering has been used to prepare the cubic perovskite structured compounds BaZr1−xInxO3−δ (0.0 ≤ x ≤ 0.75). Analysis of X-ray powder diffraction (XRPD) data reveals that the unit cell parameter, a, increases linearly with an increased Indium concentration. XRPD data was also used to demonstrate the completion of sample hydration, which was reached when the materials showed a set of single-phase Bragg-peaks. Dynamic thermogravimetric analysis (TGA) data showed that approx. 89% of the total number of available oxygen vacancies can be filled in BaZr1−xInxO3−δ for x = 0.50, and that the maximum water uptake occurs below 300 °C. Rietveld analysis of the room temperature neutron powder diffraction (NPD) data confirmed the average cubic symmetry (space group Pm-3m), and an expansion of the unit cell parameter after the hydration reaction. The strong O–H stretch band, 2500–3500 cm− 1, in the infrared absorbance spectrum clearly manifests the presence of protons in the hydrated material. Proton conductivity of hydrated BaZr1−xInxO3−δ, x = 0.75 was investigated during heating and cooling cycles under dry argon atmosphere. The total conductivity during the heating cycle was nearly two orders of magnitude greater than that of cooling cycle at 300 °C, whilst these values were similar at higher temperatures i.e. T > 600 °C.

Perovskite

X-ray diffraction

Neutron diffraction

Proton conductors

Rietveld refinement

Author

Istaq Ahmed

University of Gothenburg

Sten Eriksson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Elisabet Ahlberg

University of Gothenburg

Christopher Knee

University of Gothenburg

P. Berastegui

Arrhenius Laboratory

Lars-Gunnar Johansson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

H Rundlöf

Uppsala University

Maths Karlsson

Chalmers, Applied Physics, Condensed Matter Physics

Aleksandar Matic

Chalmers, Applied Physics, Condensed Matter Physics

Lars Börjesson

Chalmers, Applied Physics, Condensed Matter Physics

Dennis Engberg

Chalmers, Applied Physics, Condensed Matter Physics

Solid State Ionics

0167-2738 (ISSN)

Vol. 177 17-18 1395-1403

Subject Categories

Chemical Sciences

DOI

10.1016/j.ssi.2006.07.009

More information

Latest update

2/28/2018