Direct observation of elemental fluctuation and oxygen octahedral distortion-dependent charge distribution in high entropy oxides
Li Su,Huaixun Huyan,Abhishek Sarkar,Wenpei Gao,Xingxu Yan,Christopher Addiego,Robert Kruk,Horst Hahn,Xiaoqing Pan +8 more
TLDR
In this article , the atomic structure-chemical bonding-property correlations in a series of perovskite-HEOs utilizing the recently developed four-dimensional scanning transmission electron microscopy techniques are analyzed.Abstract:
Abstract The enhanced compositional flexibility to incorporate multiple-principal cations in high entropy oxides (HEOs) offers the opportunity to expand boundaries for accessible compositions and unconventional properties in oxides. Attractive functionalities have been reported in some bulk HEOs, which are attributed to the long-range compositional homogeneity, lattice distortion, and local chemical bonding characteristics in materials. However, the intricate details of local composition fluctuation, metal-oxygen bond distortion and covalency are difficult to visualize experimentally, especially on the atomic scale. Here, we study the atomic structure-chemical bonding-property correlations in a series of perovskite-HEOs utilizing the recently developed four-dimensional scanning transmission electron microscopy techniques which enables to determine the structure, chemical bonding, electric field, and charge density on the atomic scale. The existence of compositional fluctuations along with significant composition-dependent distortion of metal-oxygen bonds is observed. Consequently, distinct variations of metal-oxygen bonding covalency are shown by the real-space charge-density distribution maps with sub-ångström resolution. The observed atomic features not only provide a realistic picture of the local physico-chemistry of chemically complex HEOs but can also be directly correlated to their distinctive magneto-electronic properties. read more
Citations
More filters
Journal ArticleDOI
High‐Entropy Enhanced Microwave Attenuation in Titanate Perovskites
Biao Zhao,Zhikai Yan,Yiqian Du,L. Sreenivasa Rao,Guan Yow Chen,Yuyang Wu,Liting Yang,Jincang Zhang,Limin Wu,D. Zhang,Renchao Che +10 more
TL;DR: In this paper , a high-entropy perovskite (Ca 0.2Sr0.2Ba 0.3La 0.1Pb 0.5Pb 1.2Pb0.3) was used for microwave absorption.
Journal ArticleDOI
High‐Entropy Catalyst—A Novel Platform for Electrochemical Water Splitting
TL;DR: A comprehensive overview of HEM catalysts used in electrochemical water splitting is provided in this paper , covering both the hydrogen evolution reaction (HER) and oxygen evolution reaction(OER), and an outlook regarding the prospects and future opportunities for HEMs is provided.
Journal ArticleDOI
What is in a name: Defining “high entropy” oxides
Matthew Brahlek,Maria Gazda,Veerle Keppens,Alessandro R. Mazza,Scott J. McCormack,Aleksandra Mielewczyk-Gryń,Brianna L. Musico,Katharine Page,Christina M. Rost,Susan B. Sinnott,Cormac Toher,Thomas Ward,Ayako Yamamoto +12 more
TL;DR: A framework for classifying the differences between compositionally complex oxides, high entropy oxide, and entropy stabilized oxides is provided, which is intended to bring a common language to this emerging area of materials science.
Journal ArticleDOI
Response of structure and mechanical properties of high entropy pyrochlore to heavy ion irradiation
TL;DR: In this article , high-entropy pyrochlore was synthesized through conventional solid-state method and the as-synthesized highentropy oxide maintained crystalline after being irradiated by using Au 3+ with 9.0 MeV energy at the fluence of 4.5 × 10 15 ions·cm -2 , indicating its high tolerance to heavy-ion irradiation.
Journal ArticleDOI
Exploring the potential of high entropy perovskite oxides as catalysts for water oxidation
TL;DR: In this paper , the authors point out the strengths and discuss the challenges and prospects for high entropy perovskite oxides (HEPO) based electrocatalysts, and they also discuss the potential of HEPO-based catalysts.
References
More filters
Journal ArticleDOI
Die Gesetze der Krystallochemie
TL;DR: In this paper, the authors present a Vorstellung geben, wie die Normalschgidelife einer zuki~n]tigen Menschheit unter Annahme einer derartig geradtinigen Weiterentwickinng auf eingeschlagenem Tege aussehen wtirde.
Journal ArticleDOI
Entropy-stabilized oxides
Christina M. Rost,Edward Sachet,Trent Borman,Ali Moballegh,Elizabeth C. Dickey,Dong Hou,Jacob L. Jones,Stefano Curtarolo,Jon Paul Maria +8 more
TL;DR: It is demonstrated beyond reasonable doubt that entropy predominates the thermodynamic landscape, and drives a reversible solid-state transformation between a multiphase and single-phase state.
Journal ArticleDOI
Oxygen 1s x-ray-absorption edges of transition-metal oxides
F. M. F. de Groot,Marco Grioni,John C. Fuggle,Jacques Ghijsen,George A. Sawatzky,Harald Petersen +5 more
TL;DR: On a mesure les limites d'absorption des rayons X de l'oxygene 1s d'une serie d'oxydes de metaux de transition 3d dans les etats inoccupes du caractere metallique principal.
Journal ArticleDOI
Tuning element distribution, structure and properties by composition in high-entropy alloys.
Qingqing Ding,Yin Zhang,Xiao Chen,Xiaoqian Fu,Dengke Chen,Sijing Chen,Lin Gu,Fei Wei,Hongbin Bei,Yanfei Gao,Yanfei Gao,Minru Wen,Jixue Li,Ze Zhang,Ting Zhu,Robert O. Ritchie,Robert O. Ritchie,Qian Yu +17 more
TL;DR: Atomic-resolution chemical mapping reveals deformation mechanisms in the CrFeCoNiPd alloy that are promoted by pronounced fluctuations in composition and an increase in stacking-fault energy, leading to higher yield strength without compromising strain hardening and tensile ductility.
Journal ArticleDOI
High-entropy ceramics
TL;DR: In this paper, the authors discuss the current state of the disordered ceramics field by examining the applications and the high-entropy features fuelling them, covering both theoretical predictions and experimental results.