On the ground state of TiO2 as predicted by all electron density functional calculations in relation to experiment

Aditya Putatunda and David J. Singh ()
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Aditya Putatunda: University of Missouri
David J. Singh: University of Missouri

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 11, 1-4

Abstract: Abstract The energy ordering of rutile and anatase forms of TiO2 are reported with several density functionals as obtained using all electron calculations. Careful convergence tests were performed. Results obtained both with and without structure optimization are reported. In each case anatase is found to be more stable than rutile, in contrast to the experimental expectation. Upon full relaxation, the lattice parameters of both forms are similar to experiment regardless of the functional used. GGA functionals, which are generally regarded to be more reliable than the LDA for energies, yield a more strongly stable anatase ground state. The possibility of a poor approximation to the Ti core-electrons in pseudopotential methods can be excluded as a source of this long standing puzzle. The results are discussed in relation to experiment.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-80476-9

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