Ferromagnetic Interactions in Highly Stable, Partially Reduced TiO2: The S=2 State in Anatase
Corresponding Author
Prof. Mario Chiesa
Dipartimento di Chimica, Università degli Studi di Torino, Via Giuria 7, 10125 Torino, Italy
Search for more papers by this authorDr. Stefano Livraghi
Dipartimento di Chimica, Università degli Studi di Torino, Via Giuria 7, 10125 Torino, Italy
Search for more papers by this authorProf. Elio Giamello
Dipartimento di Chimica, Università degli Studi di Torino, Via Giuria 7, 10125 Torino, Italy
Search for more papers by this authorDr. Elisa Albanese
Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via Cozzi 55, Milano, Italy
Search for more papers by this authorProf. Gianfranco Pacchioni
Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via Cozzi 55, Milano, Italy
Search for more papers by this authorCorresponding Author
Prof. Mario Chiesa
Dipartimento di Chimica, Università degli Studi di Torino, Via Giuria 7, 10125 Torino, Italy
Search for more papers by this authorDr. Stefano Livraghi
Dipartimento di Chimica, Università degli Studi di Torino, Via Giuria 7, 10125 Torino, Italy
Search for more papers by this authorProf. Elio Giamello
Dipartimento di Chimica, Università degli Studi di Torino, Via Giuria 7, 10125 Torino, Italy
Search for more papers by this authorDr. Elisa Albanese
Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via Cozzi 55, Milano, Italy
Search for more papers by this authorProf. Gianfranco Pacchioni
Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via Cozzi 55, Milano, Italy
Search for more papers by this authorAbstract
We report direct evidence for quintuplet spin states in a particular kind of reduced TiO2 anatase obtained by the mild oxidation of TiB2 under hydrothermal conditions. Continuous-wave and pulse EPR spectroscopy at X and Q band frequencies provide compelling evidence for the presence of S=2 states, stable in a wide range of temperatures up to room temperature. A tentative model, corroborated by spin-polarized DFT calculations, is proposed, which consists of four ferromagnetically interacting Ti3+ ions with distances ranging from 0.5 nm to 0.8 nm and tetrahedral arrangement.
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