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Electronic structures of oxygen-deficient Ta2
29. CRC Handbook of Chemistry and Physics: A Ready-Reference Book of Chemical and Physical Data, 86th edition. Editor in chief: David R. Lide (CRC Press, Taylor and Francis Group, 2005).
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36. K. Ota, private communications.
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We provide a first-principles description of the crystalline and oxygen-deficient Ta 2O5 using refined computational methods and models. By performing calculations on a number of candidate structures, we determined the low-temperature phase and several stable oxygen vacancy configurations, which are notably different from the previous results. The most stable charge-neutral vacancy site induces a shallow level near the bottom of conduction band. Stability of different charge states is studied. Based on the results, we discuss the implications of the level structures on experiments, including the leakage current in Ta 2O5-based electronic devices and catalysts.
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