TY - JOUR
T1 - XANES study on the evolution among different copper species, Cu-I, Cu-II and Cu-III, in CuBa2YCu2O6+z upon oxygen loading
AU - Morita, Y.
AU - Karppinen, M.
AU - Yamauchi, H.
AU - Liu, R. S.
AU - Chen, J. M.
PY - 2003/5
Y1 - 2003/5
N2 - X-ray absorption near-edge structure (XANES) spectroscopy at the Cu L-edge is applied to follow the gradual formation of CuII and CuIII species from the Cu1 species with increasing amount of excess oxygen, z, in Cu(1) Ba2 Y Cu(2 2 O6+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)I in the charge-reservoir tends to be first oxidized to Cu(1)II rather than directly to Cu(1 )III, suggesting that complete chain formation does not occur at low oxygen contents.
AB - X-ray absorption near-edge structure (XANES) spectroscopy at the Cu L-edge is applied to follow the gradual formation of CuII and CuIII species from the Cu1 species with increasing amount of excess oxygen, z, in Cu(1) Ba2 Y Cu(2 2 O6+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)I in the charge-reservoir tends to be first oxidized to Cu(1)II rather than directly to Cu(1 )III, suggesting that complete chain formation does not occur at low oxygen contents.
UR - http://www.scopus.com/inward/record.url?scp=0038238864&partnerID=8YFLogxK
U2 - 10.1023/A:1022918328725
DO - 10.1023/A:1022918328725
M3 - Article
AN - SCOPUS:0038238864
VL - 131
SP - 381
EP - 386
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
SN - 0022-2291
IS - 3-4
ER -