Synthesis and structural characterization of perovskite type proton conducting BaZr1−xInxO3−δ (0.0 ≤ x ≤ 0.75)
Artikel i vetenskaplig tidskrift, 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

Författare

Istaq Ahmed

Göteborgs universitet

Sten Eriksson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Elisabet Ahlberg

Göteborgs universitet

Christopher Knee

Göteborgs universitet

P. Berastegui

Arrhenius Laboratory

Lars-Gunnar Johansson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

H Rundlöf

Uppsala universitet

Maths Karlsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Lars Börjesson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Dennis Engberg

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Solid State Ionics

0167-2738 (ISSN)

Vol. 177 17-18 1395-1403

Ämneskategorier

Kemi

DOI

10.1016/j.ssi.2006.07.009

Mer information

Senast uppdaterat

2018-02-28