Giant Pressure-Driven Lattice Collapse Coupled with Intermetallic Bonding and Spin-State Transition in Manganese Chalcogenides

Materials with an abrupt volume collapse of more than 20 % during a pressure‐induced phase transition are rarely reported. In such an intriguing phenomenon, the lattice may be coupled with dramatic changes of orbital and/or the spin‐state of the transition metal. A combined in situ crystallography a...

Full description

Saved in:
Bibliographic Details
Published in:Angewandte Chemie 2016-08, Vol.128 (35), p.10506-10509
Main Authors: Wang, Yonggang, Bai, Ligang, Wen, Ting, Yang, Liuxiang, Gou, Huiyang, Xiao, Yuming, Chow, Paul, Pravica, Michael, Yang, Wenge, Zhao, Yusheng
Format: Article
Language:English
Subjects:
Cell size
Chalcogenides
Chemistry
Collapse
Compressing
Compression
Crystallography
Diffraction
Electron spin
Gitterkollaps
Hochdruckchemie
Intermetallics
Lattices
Manganchalkogenide
Manganese
Metall-Metall-Bindung
Metastable phases
Phase transformations
Phase transitions
Pressure
Spinübergänge
Transition metals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Materials with an abrupt volume collapse of more than 20 % during a pressure‐induced phase transition are rarely reported. In such an intriguing phenomenon, the lattice may be coupled with dramatic changes of orbital and/or the spin‐state of the transition metal. A combined in situ crystallography and electron spin‐state study to probe the mechanism of the pressure‐driven lattice collapse in MnS and MnSe is presented. Both materials exhibit a rocksalt‐to‐MnP phase transition under compression with ca. 22 % unit‐cell volume changes, which was found to be coupled with the Mn2+(d5) spin‐state transition from S=5/2 to S=1/2 and the formation of Mn−Mn intermetallic bonds as supported by the metallic transport behavior of their high‐pressure phases. Our results reveal the mutual relationship between pressure‐driven lattice collapse and the orbital/spin‐state of Mn2+ in manganese chalcogenides and also provide deeper insights toward the exploration of new metastable phases with exceptional functionalities. Unter Druck: Ein Gitterkollaps großen Ausmaßes während des druckgetriebenen Phasenübergangs in Manganchalkogeniden geht einher mit der Bildung von Metall‐Metall‐Bindungen und einem Übergang von hohem zu niedrigem Spinzustand.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201605410