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Electrical Conductivity Improvement of Nd 2 Ce 2 O 7 Ceramic Co‐doped with Gd 2 O 3 and ZrO 2
Author(s) -
Liu Z.G.,
Ouyang J.H.,
Sun K.N.
Publication year - 2011
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201000184
Subject(s) - materials science , electrical resistivity and conductivity , analytical chemistry (journal) , ceramic , coprecipitation , conductivity , calcination , arrhenius equation , doping , atmospheric temperature range , activation energy , inorganic chemistry , chemistry , metallurgy , catalysis , chromatography , electrical engineering , engineering , physics , meteorology , biochemistry , optoelectronics
(Nd 1– x Gd x ) 2 (Ce 1– x Zr x ) 2 O 7 (0 ≤ x ≤ 0.5) ceramic powders synthesised by the chemical‐coprecipitation and calcination method were pressureless‐sintered at 1,973 K for 10 h in air. The structure and electrical conductivity of (Nd 1– x Gd x ) 2 (Ce 1– x Zr x ) 2 O 7 ceramics were investigated by the X‐ray diffraction and impedance spectroscopy measurements. (Nd 1– x Gd x ) 2 (Ce 1– x Zr x ) 2 O 7 (0 ≤ x ≤ 0.5) ceramics exhibit a single phase of defect fluorite‐type structure. The electrical conductivity of (Nd 1– x Gd x ) 2 (Ce 1– x Zr x ) 2 O 7 ceramics increases with temperature in the range 623–1,173 K following an Arrhenius law. At identical temperature levels, the measured electrical conductivity of (Nd 1– x Gd x ) 2 (Ce 1– x Zr x ) 2 O 7 ceramics varies with doping different Gd 2 O 3 and ZrO 2 contents and exhibits a maximum at x = 0.1.