Abstract

The dispute over Ta2O5 atomic structure was recently resolved by the discovery of the λ -phase model (space group Pbam), but due to the widely scattered experimental band gaps, the energy band gap of Ta2O5 still remains questionable. This letter presents a complete first principle calculation of the λ phase Ta2O5 energy band gap and looks at how different conditions of strain can modify it. From the results, we conclude that the theoretical band gap of λ phase Ta2O5 is about 3.7 eV and show that the band gap difference of about 0.45 eV can be made by only 3% compressive or tensile strain.

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