Stoichiometry and copper valence in the Ba1–yCuO2+δ system
Stoichiometry and copper valence in the Ba1–yCuO2+δ system
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Ba1–yCuO2+δ 体系中的化学计量和铜价
DOI：
10.1039/a806773b
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
L. Niinistö
中科院分区：
文献类型：
--
作者：
K. Peitola;K. Fujinami;M. Karppinen;H. Yamauchi;L. Niinistö
阳离子化学计量与碱中氧含量的可调性
1-y
CuO
2+δ
用各种化学分析方法对其物相进行了研究。不同标称金属化学计量比的样品，y
诺姆
在0~0.1的范围内，都被合成了。获得了单相Y-Y样品。
诺姆
≈0.1，即具有约10摩尔%的Ba2缺乏。稳定基础的可能性
1-y
CuO
2+δ
用热重分析法研究了不同氧化学计量比的物相。在400 °C以下的Ar气氛下，全氧碱的部分过剩氧
0.9
CuO
2.01
样品被发现分两步释放，导致了Ba2+的化学计量
0.9
CuO
1.97
和基数
0.9
CuO
1.94
。另一方面，在400 °C以上，可以连续地将氧化学计量比调到至少低至碱
0.9
CuO
1.85
(700 °C)。随着氧含量的减少，铜的价态降低，导致从两个碱基的磁化率测量中获得的有效磁矩增加
0.9
CuO
2+δ
氧化学计量比不同的样品。
The cation stoichiometry and the tunability of oxygen content in the Ba
1–y
CuO
2+δ
phase were investigated by means of various methods of chemical analysis. Samples with different nominal metal stoichiometries, y
nom
ranging from 0 to 0.1, were synthesized. Single-phase samples were obtained for y
nom
≈0.1, i.e. with about 10 mol% barium deficiency. The possibility to stabilize the Ba
1–y
CuO
2+δ
phase with different oxygen stoichiometries was studied thermogravimetrically. Under an argon atmosphere below 400 °C a part of the excess oxygen of the fully oxygenated Ba
0.9
CuO
2.01
sample was found to be released in two steps leading to stoichiometries of Ba
0.9
CuO
1.97
and Ba
0.9
CuO
1.94
. On the other hand, above 400 °C it was possible to continuously tune the oxygen stoichiometry at least down to Ba
0.9
CuO
1.85
(700 °C). A decrease in the copper valence with decreasing oxygen content led to an increase in the effective magnetic moment obtained from the magnetic susceptibility measurements performed for two Ba
0.9
CuO
2+δ
samples with different oxygen stoichiometries.