High-temperature transport and defect studies of quadruple perovskites: La{sub 2}Ba{sub 2}Cu{sub 2}Sn{sub 2}O{sub 11}, Eu{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11}, and La{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11}
Journal Article
·
· Journal of Solid State Chemistry
- Northwestern Univ., Evanston, IL (United States); and others
High temperature electrical conductivity and Seebeck coefficient measurements were performed on the quadruple perovskites La{sub 2}Ba{sub 2}Cu{sub 2}Sn{sub 2}O{sub 11}, Eu{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11}, and La{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11}. A transition from n- to p-type semiconductivity is observed for La{sub 2}Ba{sub 2}Cu{sub 2}Sn{sub 2}O{sub 11} as a function of oxygen partial pressure. However, both electrons and holes contribute to the electrical properties over the entire range of experimental conditions. Both Eu{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11} and La{sub 2}Ba{sub 2}Cu{sub 2}Ti{sub 2}O{sub 11} display p-type extrinic semiconductivity at high oxygen partial pressures and low temperatures. A transition to lightly doped p-type, intrinsic semiconductivity occurs at low oxygen partial pressures and high temperatures. Combined conductivity and thermopower (Jonker) analysis was employed to elucidate the defect structure and the conduction parameters in these compounds. The similarity of these materials to high-T{sub c} cuprates is discussed.
- DOE Contract Number:
- FG02-84ER45097
- OSTI ID:
- 237556
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 119; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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