Journal
DALTON TRANSACTIONS
Volume 40, Issue 37, Pages 9544-9550Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0dt01731k
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Funding
- National Natural Science Foundation of China [50802096, 10904150]
- Nature Science Foundation of Anhui Province of China [090414184]
- National Key Basic Research grant [2011CBA00111]
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Bi2Sr3Co2Oy thin films are prepared on SrTiO3 (100), (110) and (111) single crystal substrates using the sol-gel method. All the thin films are c-axis oriented regardless of the orientation of the substrate suggesting self-assembled c-axis orientation, and X-ray photoelectron spectroscopy results give evidence of coexistence of Co3+ and Co2+ ions in the derived films. Transmission electronic microscopy observations reveal that all samples are c-axis oriented with no obvious differences for different samples, and the c-axis lattice constant is determined as similar to 15 angstrom suggesting the misfit structure. A phenomenological thermodynamic phase diagram for self-assembled c-axis orientation is established for misfit cobaltate-based films using chemical solution deposition. All samples behave like semiconductors due to the coexistence of Co3+/Co2+ ions, and the resistivity at 350 K is similar to 47, 39 and 17 m Omega cm for the thin films on SrTiO3 (100), (110) and (111), respectively, whereas the Seebeck coefficient at 300 K is 97, 89 and 77 mu V K-1. The successful attainment of Bi2Sr3Co2Oy thin films with self-assembled c-axis orientation will provide an effective prototype for investigation of growth mechanisms in complex oxide thin films with a misfit structure.
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