Role of B-site ion on proton conduction in acceptor-doped Sm2B2O7-δ (B = Ti, Sn, Zr and Ce) pyrochlores and C-type compounds

被引：17
作者：
Eurenius, Karinh E. J. [1 ]
Ahlberg, Elisabet [1 ]
Knee, Christopher S. [1 ]
机构：
[1] Univ Gothenburg, Dept Chem, SE-41296 Gothenburg, Sweden
来源：
DALTON TRANSACTIONS | 2011年 / 40卷 / 15期
基金：
瑞典研究理事会;
关键词：
PEROVSKITE-TYPE OXIDES; CA2+-DOPED LA2ZR2O7; ELECTRICAL-PROPERTIES; HIGH-TEMPERATURE; CHARGE-CARRIERS; MOBILITY;
D O I：
10.1039/c0dt01347a
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Proton conduction in three pyrochlores, Sm1.92Ca0.08B2O7-delta, B = Ti, Sn, Zr and one phase with a related C-type fluorite superstructure, B = Ce, has been investigated. The samples were prepared by solid state reaction. Infrared spectroscopy measurements and thermogravimetric analysis were carried out to study the extent of proton dissolution and determine its dependence on the B-site ion. Electrochemical impedance spectroscopy, performed on heating and cooling pre-hydrated samples, confirmed significant levels of proton conduction for Sm1.92Ca0.08Ti2O7-delta and Sm1.92Ca0.08Sn2O7-delta up to T similar to 500 degrees C. In comparison the B = Zr and Ce samples revealed lower levels of proton conductivity, confined to temperatures below similar to 400 degrees C. Proton diffusion coefficients of 3.36 x 10(-8), 1.73 x 10(-9), 5.53 x 10(-10) and 2.78 x 10(-11) cm(2) s(-1) were determined at 300 degrees C for samples with B = Ti, Sn, Zr and Ce respectively. The proton mobility of Sm1.92Ca0.08Ti2O7-delta is therefore approximately one order of magnitude lower than that found in yttrium-doped perovskite phases such as BaZrO3 and BaCeO3.
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收藏
页码：3946 / 3954
页数：9
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