(Mg,Mn,Fe,Co,Ni)O: A rocksalt high-entropy oxide containing divalent Mn and Fe.

Autor: Pu Y; Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand., Moseley D; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., He Z; School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China., Pitike KC; Nuclear Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA., Manley ME; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Yan J; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Cooper VR; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Mitchell V; Australian Synchrotron, Australian Nuclear Science and Technology Organisation, Clayton, VIC 3168, Australia., Peterson VK; Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Sydney, New South Wales 2232, Australia., Johannessen B; Australian Synchrotron, Australian Nuclear Science and Technology Organisation, Clayton, VIC 3168, Australia., Hermann RP; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Cao P; Department of Chemical and Materials Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.; MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University Wellington, PO Box 600, Wellington, New Zealand.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2023 Sep 22; Vol. 9 (38), pp. eadi8809. Date of Electronic Publication: 2023 Sep 20.
DOI: 10.1126/sciadv.adi8809
Abstrakt: High-entropy oxides (HEOs) have aroused growing interest due to fundamental questions relating to their structure formation, phase stability, and the interplay between configurational disorder and physical and chemical properties. Introducing Fe(II) and Mn(II) into a rocksalt HEO is considered challenging, as theoretical analysis suggests that they are unstable in this structure under ambient conditions. Here, we develop a bottom-up method for synthesizing Mn- and Fe-containing rocksalt HEO (FeO-HEO). We present a comprehensive investigation of its crystal structure and the random cation-site occupancy. We show the improved structural robustness of this FeO-HEO and verify the viability of an oxygen sublattice as a buffer layer. Compositional analysis reveals the valence and spin state of the iron species. We further report the antiferromagnetic order of this FeO-HEO below the transition temperature ~218 K and predict the conditions of phase stability of Mn- and Fe-containing HEOs. Our results provide fresh insights into the design and property tailoring of emerging classes of HEOs.
Databáze: MEDLINE