Open AccessTexture and electrical transport properties of Ba and Ag double substituted BaxAgyCa3-x-yCo4O9 oxide
Author(s) -
Feipeng Zhang,
Lu Qing-Mei,
Jiuxing Zhang,
Xinan Zhang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.2697
Subject(s) - materials science , electrical resistivity and conductivity , texture (cosmology) , scanning electron microscope , spark plasma sintering , analytical chemistry (journal) , oxide , stoichiometry , diffraction , orientation (vector space) , sintering , composite material , optics , metallurgy , chemistry , chromatography , artificial intelligence , computer science , electrical engineering , image (mathematics) , engineering , physics , geometry , mathematics
Doublesubstituted BaxAgyCa3-x-yCo4O9 bulks were fabricated by nitric acid solgel and spark plasma sintering, and the phase composition, orientation, texture and electrical transport properties of the bulks were investigated by means of X-ray diffraction,scanning electron microscope and electrical resisitivity measurement. The result shows that silver which does not belong to the stoichiometric compounds BaxAgyCa28Co4O9 is distributed in the matrix. The degree of orientation increases with increasing ratio of Ba to Ag for the doublesubstituted bulk. The orientation of BaxAgyCa28Co4O9 y>0 bulks is prominently lower than that of Ca3Co4O9 and the orientation of Ba02Ca28Co4O9 bulk is higher than that of Ca3Co4O9 bulk. The electrical transport mechanism of the bulk with x=y=01 is changed slightly. The Ba01Ag01Ca28Co4O9 bulk exhibits simultaneously lowered orientation and moderately low resistivity and the resistivity reaches 73 mΩ·cm at 973 K. The Ag02Ca28Co4O9 bulk exhibits lowest orientation and lowest resistivity, reaching 63 mΩ·cm at 973 K.