FABRITCHNYI, P.; WATTIAUX, Alain; KOROLENKO, M. V.; DELMAS, Claude

doi:10.1016/j.ssc.2009.06.002

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FABRITCHNYI, P.
Department of Chemistry, Lomonosov Moscow State University

WATTIAUX, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

KOROLENKO, M. V.
Department of Chemistry, Lomonosov Moscow State University

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Solid State Communications. 2009, vol. 149, n° 37-38, p. 1535-1538

Elsevier

Résumé en anglais

Magnetic hyperfine splitting of the 119Sn4+ nuclear levels in the antiferromagnetic NiTiO3 was for the first time observed using the Mössbauer effect. For the majority of the 119Sn4+ dopant ions, the saturation value of the transferred hyperfine field (at 4.2 K, H = 5.25 T) is found to be equal to that previously reported for 119Sn4+ in the antiferromagnetic MnTi03. This finding shows that in both ilmenites the spin polarization of Sn4+ is produced by the divalent cation half-filled e2g orbitals involved in interlayer superexchange interactions and implies the location of the dopant within titanium (111) layers. The principal Vzz component of the EFG at the Sn4+ site in NiTiO3 is found to have a positive sign and be aligned along the [111] axis, as it was the case for Sn4+ in MnTiO3. Lattice-sum calculations on the basis of a simple ionic point-charge model, lead to an erroneous result (in either titanate the sign of Vzz on the Ti4+ site would be negative) and thus demonstrate their failure in identifying the Sn sites.< Réduire

Mots clés en anglais

Antiferromagnetic materials

Nickel titanates

Point charge approximation

Electric field gradients

Superexchange interactions

Spin polarization

Hyperfine magnetic field

Hyperfine splitting

Doping

Mössbauer effect

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Mössbauer characterization of <sup>119</sup>Sn<sup>4+</sup> Dopant ions in the antiferromagnetic ilmenite NiTiO<sub>3</sub>

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