Synthesis and structural characterization of perovskite type proton conducting BaZr1-xInxO3-δ (0.0≤x≤0.75)

被引:64
作者
Ahmed, I.
Eriksson, S-G.
Ahlberg, E.
Knee, C. S.
Berastegui, P.
Johansson, L-G.
Rundlof, H.
Karlsson, M.
Matic, A.
Borjesson, L.
Engberg, D.
机构
[1] Univ Gothenburg, Dept Chem, SE-41296 Gothenburg, Sweden
[2] Chalmers, Dept Environm Inorgan Chem, SE-41296 Gothenburg, Sweden
[3] Stockholm Univ, Arrhenius Lab, Dept Inorgan Chem, SE-10691 Stockholm, Sweden
[4] Uppsala Univ, Dept Chem Mat, SE-75121 Uppsala, Sweden
[5] Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden
关键词
X-ray diffraction; neutron diffraction; proton conductors; rietveld refinement; perovskite;
D O I
10.1016/j.ssi.2006.07.009
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Solid state sintering has been used to prepare the cubic perovskite structured compounds BaZr1-xInxO3-delta (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-delta for x=0.50, and that the maximum water uptake occurs below 300 degrees 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-delta, 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 degrees C, whilst these values were similar at higher temperatures i.e. T > 600 degrees C. (c) 2006 Published by Elsevier B.V.
引用
收藏
页码:1395 / 1403
页数:9
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