Preparation of Bulk‐Phase Nitride Perovskite LaReN 3 and Topotactic Reduction to LaNiO 2 ‐Type LaReN 2
While halide and oxide perovskites are numerous and many display outstanding properties, ABN 3 perovskite nitrides are extremely rare due to synthetic challenges arising from the low chemical potential of nitrogen and a tendency to form low‐coordination nitridometallate anions. We report the prepara...
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Veröffentlicht in: | Angewandte Chemie 2021-10, Vol.133 (41), p.22434-22438 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | While halide and oxide perovskites are numerous and many display outstanding properties, ABN
3
perovskite nitrides are extremely rare due to synthetic challenges arising from the low chemical potential of nitrogen and a tendency to form low‐coordination nitridometallate anions. We report the preparation of a perovskite nitride LaReN
3
through azide‐mediated oxidation at high pressure. High‐resolution synchrotron diffraction shows that LaReN
3
has a low‐symmetry, triclinic, perovskite superstructure resulting from orbital ordering with strong spin‐orbit coupling distortions. Topotactic reduction of LaReN
3
above 500 °C leads to layered tetragonal LaReN
2
via a probable LaReN
2.5
intermediate, which is the first reported example of nitride defect perovskites. Magnetisation and conductivity measurements indicate that LaReN
3
and LaReN
2
are both metallic solids. The two chemical approaches presented are expected to lead to new classes of ABN
3
and defect ABN
3−
x
nitride perovskite materials. |
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ISSN: | 0044-8249 1521-3757 |
DOI: | 10.1002/ange.202108759 |