XANES Study on the Evolution Among Different Copper Species, CuI, CuII and CuIII, in CuBa2YCu2O6+z Upon Oxygen Loading
XANES Study on the Evolution Among Different Copper Species, CuI, CuII and CuIII, in CuBa2YCu2O6+z Upon Oxygen Loading
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XANES 研究 CuBa2YCu2O6 z 中不同铜形态（CuI、CuII 和 CuIII）在氧负载下的演化
DOI：
10.1023/a:1023438118364
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发表时间：
2003
影响因子：
2
通讯作者：
J. M. Chen
中科院分区：
文献类型：
--
作者：
Y. Morita;M. Karppinen;H. Yamauchi;R. Liu;J. M. Chen
用X-射线吸收近边结构(XANES)谱跟踪了CuI随着Cu2YCu2O6+z中过量氧含量z的增加而逐渐形成CuII和CuIII物种的过程。为了研究，利用样品合成中的温控耗氧(TCOD)退火法和库仑滴定技术制备了一系列氧含量精确控制的样品。结果表明，在低氧过剩条件下，电荷库中的z、Cu(1)i倾向于先氧化成Cu(1)I，而不是直接氧化成Cu(1)III，这表明在低氧含量下不会发生完全的成链反应。
X-ray absorption near-edge structure (XANES) spectroscopy at the CuL-edge is applied to follow the gradual formation of CuIIand CuIIIspecies from CuIwith increasing amount of excess oxygen,z, in Cu(1)Ba2YCu(2)2O6+z. For the study, a series of samples with precisely controlled oxygen contents was prepared utilizing the temperature-controlled oxygen-depletion (TCOD) annealing technique in the sample synthesis and employing coulometric titration for accurate oxygen-content analysis. It may be concluded that at low amounts of excess oxygen,z, Cu(1)Iin the charge reservoir tends to be first oxidized to Cu(1)IIrather than directly to Cu(1)III, suggesting that complete chain formation does not occur at low oxygen contents.