Preparation of bulk‐phase nitride perovskite LaReN3 and topotactic reduction to LaNiO2‐type LaReN2

Simon David Kloß, Martin L. Weidemann, J. Paul Attfield

Research output: Contribution to journalArticlepeer-review

Abstract

While halide and oxide perovskites are numerous and many display outstanding properties, ABN 3 perovskite nitrides are extremely rare due synthetic challenges arising from the low chemical potential of nitrogen and a tendency to form low-coordination nitridometallate anions. Here 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, the first reported examples of nitride defect-perovskites. Magnetisation and conductivity measurements indicate that LaReN 3 and LaReN 2 are both metallic solids. The two chemical approaches presented here are expected to lead to new classes of ABN 3 and defect ABN 3−x nitride perovskite materials.
Original languageEnglish
JournalAngewandte Chemie International Edition
Early online date6 Aug 2021
DOIs
Publication statusE-pub ahead of print - 6 Aug 2021

Fingerprint

Dive into the research topics of 'Preparation of bulk‐phase nitride perovskite LaReN3 and topotactic reduction to LaNiO2‐type LaReN2'. Together they form a unique fingerprint.

Cite this