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In this comment to [S. Lenjer, O. F. Schirmer, H. Hesse, and Th. W. Kool,Phys. Rev. B {\bf 66}, 165106 (2002)] we discuss the electronic structure ofoxygen vacancies in perovskites. First principles computations are in favour ofrather deep levels in these vacancies, and Lenjer et al suggest that theelectrons' interaction energy is negative, but data on electroconductivity areagainst.Comment: 2 pages, no figure

physical review. b, condensed matter and materials physics

Comment on “Conduction states in oxide perovskites: Three manifestations of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>Ti</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Jahn-Teller polarons in barium titanate”

Comment on “Conduction states in oxide perovskites: Three manifestations ofTi3+Jahn-Teller polarons in barium titanate”