TY - JOUR
T1 - XANES study on the evolution among different copper species, CuI, CuII and CuIII, in CuBa2YCu2O6+z upon oxygen loading
AU - Morita, Y.
AU - Karppinen, M.
AU - Yamauchi, H.
AU - Liu, R. S.
AU - Chen, J. M.
PY - 2003/6
Y1 - 2003/6
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 CuI with increasing amount of excess oxygen, z, in Cu(1) Ba2 YCu(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 CuI with increasing amount of excess oxygen, z, in Cu(1) Ba2 YCu(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=0037596492&partnerID=8YFLogxK
U2 - 10.1023/A:1023438118364
DO - 10.1023/A:1023438118364
M3 - Article
AN - SCOPUS:0037596492
VL - 131
SP - 1205
EP - 1210
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
SN - 0022-2291
IS - 5-6
ER -