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- W2053641943 abstract "The surface crystal structure of the Co3O4(1 1 0) spinel was characterized by low energy electron diffrac- tion (LEED), X-ray photoelectron spectroscopy (XPS), and Auger electron spectroscopy (AES). Well-defi ned LEED diffraction patterns showed an unreconstructed Co3O4(1 1 0) surface in Type A termination, and XPS and Auger indi- cated the surface to be stoichiometric with octahedral and tetrahedral cation sites occupied by 3+ and 2+ cations, re- spectively. The experimental lattice parameters of 8.22 A ± 0.2 A and 5.50 A ± 0.2 A in the (0 0 1) and (1 ¯ 1 0) direc- tions, respectively, are in agreement with a bulk-terminated unit cell. The impurities: K, Ca, Na, and Cu segregated to the surface after prolonged heating to 630 K. K, Ca and Na could easily be removed by routine cleaning procedures and did not affect the Co3O4(1 1 0) structure or stoichiom- etry detectably in the submonolayer levels at which they were observed. However, the copper impurity resulted in the formation of a Cu2O(1 1 0) overlayer, with the accompanying reduction of the spinel surface to a rocksalt met- al monoxide-like surface. The copper oxide formed a distorted hexagonal overlayer incommensurate with that of the Co3O4(1 1 0) stoichiometric surface and with periodic spacings of 3.86 A ± 0.2 A in the (0 0 1) and 4.10 A ± 0.2 A in the (1 ¯ 1 0)directions in agreement with Cu2O(1 1 0) bulk termination. The Co3O4(1 1 0) substrate could not be ful- ly re-oxidized until all detectable copper had been removed from the surface." @default.
- W2053641943 created "2016-06-24" @default.
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- W2053641943 date "2005-12-01" @default.
- W2053641943 modified "2023-09-25" @default.
- W2053641943 title "Cu2O(110) formation on Co3O4(110) induced by copper impurity segregation" @default.
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- W2053641943 doi "https://doi.org/10.1016/j.susc.2005.09.034" @default.
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