Observation of carboxylic groups in the lattice of sintered Ba2YCu3O7-y high-Tc superconductors.
Observation of carboxylic groups in the lattice of sintered Ba2YCu3O7-y high-Tc superconductors.
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DOI：
10.1103/physrevb.36.7148
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发表时间：
1987-11
期刊：
影响因子：
--
通讯作者：
Parmigiani;Chiarello;Ripamonti;Goretzki;Roll
中科院分区：
文献类型：
--
作者：
Parmigiani;Chiarello;Ripamonti;Goretzki;Roll
This study reports for the first time the experimental evidence that stable carboxylic groups are present in the lattice of sintered ${\mathrm{Ba}}_{2}\mathrm{Y}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}y}$ superconducting oxides. The carboxylic groups likely originated in the incomplete calcination of the BaC${\mathrm{O}}_{3}$ precursor powder and they could be responsible for the oxygen over-stoichiometry observed in these materials. Further experimental investigations are required concerning in particular the sites of carboxylic groups in the Ba-Y-Cu-O lattice and their effects on the tetragonal-orthorhombic instability.
This study reports for the first time the experimental evidence that stable carboxylic groups are present in the lattice of sintered ${\mathrm{Ba}}_{2}\mathrm{Y}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}y}$ superconducting oxides. The carboxylic groups likely originated in the incomplete calcination of the BaC${\mathrm{O}}_{3}$ precursor powder and they could be responsible for the oxygen over-stoichiometry observed in these materials. Further experimental investigations are required concerning in particular the sites of carboxylic groups in the Ba-Y-Cu-O lattice and their effects on the tetragonal-orthorhombic instability.