In:
Angewandte Chemie, Wiley, Vol. 127, No. 2 ( 2015-01-07), p. 526-531
Kurzfassung:
The synthesis, structure, and magnetic properties of a polar and magnetic oxynitride MnTaO 2 N are reported. High‐pressure synthesis at 6 GPa and 1400 °C allows for the stabilization of a high‐density structure containing middle‐to‐late transition metals. Synchrotron X‐ray and neutron diffraction studies revealed that MnTaO 2 N adopts the LiNbO 3 ‐type structure, with a random distribution of O 2− and N 3− anions. MnTaO 2 N with an “orbital‐inactive” Mn 2+ ion (d 5 ; S =5/2) exhibits a nontrivial helical spin order at 25 K with a propagation vector of [0,0,δ] ( δ ≈0.3), which is different from the conventional G‐type order observed in other orbital‐inactive perovskite oxides and LiNbO 3 ‐type oxides. This result suggests the presence of strong frustration because of the heavily tilted MnO 4 N 2 octahedral network combined with the mixed O 2− /N 3− species that results in a distribution of (super)‐superexchange interactions.
Materialart:
Online-Ressource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.201408483
Sprache:
Deutsch
Verlag:
Wiley
Publikationsdatum:
2015
ZDB Id:
505868-5
ZDB Id:
506609-8
ZDB Id:
514305-6
ZDB Id:
505872-7
ZDB Id:
1479266-7
ZDB Id:
505867-3
ZDB Id:
506259-7
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