Single crystal Ba_(0.6)K_(0.4)BiO_3 was studied by using XPS.The results show that there is no evidence for the presence of Bi^(5+) in single crystal of Ba_(0.6)K_(0.4)BiO_3;instead,there is evidence for the presence ...Single crystal Ba_(0.6)K_(0.4)BiO_3 was studied by using XPS.The results show that there is no evidence for the presence of Bi^(5+) in single crystal of Ba_(0.6)K_(0.4)BiO_3;instead,there is evidence for the presence of mixed valent Bi^(3+) and Bi^((3+)-δ).Moreover,the O1s XPS results suggest the presence of mixed valent O^(2-) and O^(1-),and the valence band spectrum suggests the high degree of covalency for Bi—O bonds.展开更多
基金Project supported by National Science Foundation of U.S.A.(grant No.CHE-9215173)National Center for R & D on superconductivity of China.
文摘Single crystal Ba_(0.6)K_(0.4)BiO_3 was studied by using XPS.The results show that there is no evidence for the presence of Bi^(5+) in single crystal of Ba_(0.6)K_(0.4)BiO_3;instead,there is evidence for the presence of mixed valent Bi^(3+) and Bi^((3+)-δ).Moreover,the O1s XPS results suggest the presence of mixed valent O^(2-) and O^(1-),and the valence band spectrum suggests the high degree of covalency for Bi—O bonds.
