Article
Materials Science, Ceramics
Kepi Chen, Jinxu Ma, Hetong Wang, Cuiwei Li, Linan An
Summary: Medium-entropy oxides, ((Mg1/3Co1/3Ni1/3)(1-x)Zn-x)O with x between 0.292 and 0.388, were synthesized and proven to be entropy stabilized. The estimated enthalpy of mixing of these oxides showed a linear relationship with ZnO concentration. The predicted critical temperature (Tc) based on extrapolated mixing enthalpy was consistent with experimental results.
CERAMICS INTERNATIONAL
(2021)
Review
Chemistry, Physical
Xudong Gao, Xiaoyu Zhang, Xiangyu Liu, Yinfeng Tian, Qiuyun Cai, Min Jia, Xiaohong Yan
Summary: In recent years, layered oxides have been widely studied as promising cathode materials for sodium-ion batteries. However, complex phase transitions during charge-discharge process negatively impact their electrochemical performance. High-entropy layered oxides, with 2D ion migration channels between layers, show improved cycling performance. This paper reviews the research status of high-entropy layered oxides in sodium-ion batteries, focusing on the connection between high-entropy and layered oxide phase transitions during electrochemical charging and discharging, and summarizes the advantages and challenges of future high-entropy layered materials.
Article
Nanoscience & Nanotechnology
Olivia F. Dippo, Kenneth S. Vecchio
Summary: In recent years, high-entropy materials have become increasingly complex, prompting the proposal of a new entropy metric that is universally applicable for a wide range of crystalline materials, including those with complex crystal structures. This new metric aims to provide a more accurate measure of entropy for these materials beyond the traditional metrics based on metals-specific approximations.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Yogesh Sharma, Min-Cheol Lee, Krishna Chaitanya Pitike, Karuna K. Mishra, Qiang Zheng, Xiang Gao, Brianna L. Musico, Alessandro R. Mazza, Ram S. Katiyar, Veerle Keppens, Matthew Brahlek, Dmitry A. Yarotski, Rohit P. Prasankumar, Aiping Chen, Valentino R. Cooper, T. Zac Ward
Summary: This study demonstrates the stabilization of relaxor ferroelectric materials that do not rely on a single narrow phase transition region at the strong limit of compositional complexity in perovskite structure. Ba(5B)O films, synthesized using entropy-assisted synthesis methods, exhibit high levels of configurational disorder that influence dielectric relaxation, phase transitions, nanopolar domain formation, and Curie temperature. The ability to stabilize these highly disordered single-phase perovskites offers possibilities for designing high-performance relaxor ferroelectric materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Jingxie Xiong, Yifei Zhao, Jiaxi Zhu, Xiaoyan Yang, Xiaojun Kuang, Chun-Hai Wang, Qinyuan Zhang, Shi Ye
Summary: In this study, CaTiO3:Li+,Yb3+,Er3+ was chosen as a model to optically interpret a second-order phase transition induced by thermal-driven Li+ migration. The intensity pairwise ratios of the emission peaks of Er3+ versus temperature showed a continuous behavior with a break point at the ignition point of Li+ motion. The gap between the phase transition and Er3+ luminescence variation was bridged by the number variation of microstates, referring to the chemical environment around Er3+ ions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Multidisciplinary
Wei Hu, Wen-Wei Luo, Mu-Sheng Wu, Bo Xu, Chu-Ying Ouyang
Summary: Spinel-type LiMn2O4 is a promising cathode material for rechargeable Li-ion batteries due to its thermal stability and safety. The stability of the cubic phase is greatly influenced by the configurational entropy. The predicted phase transition temperature is comparable to the experimentally observed temperature. These results are beneficial for improving the electrochemical performance of LiMn2O4 cathodes.
Article
Chemistry, Physical
Yilun Huang, Shizhen Zhi, Shengnan Zhang, Wenqing Yao, Weiqin Ao, Chaohua Zhang, Fusheng Liu, Junqin Li, Lipeng Hu
Summary: Entropy engineering is introduced as a paradigm-shifting strategy in thermoelectrics, where optimizing alloy composition design to enhance the thermoelectric performance of GeTe-based alloys by increasing configurational entropy, reducing carrier concentration, and ultimately achieving a higher Seebeck coefficient.
Article
Physics, Multidisciplinary
W. Barreto, A. Herrera-Aguilar, R. da Rocha
Summary: This paper investigates a family of deformed models generated by twisting the sine-Gordon model. The 3-sine-Gordon model is specifically addressed, and the differential configurational entropy and complexity of three topological sectors are discussed using two complementary approaches. Stability aspects are also considered.
Article
Nanoscience & Nanotechnology
Mengyuan Zhang, Xiaolan Duan, Ying Gao, Shuangshuang Zhang, Xiaoyan Lu, Kongliang Luo, Jian Ye, Xiaopeng Wang, Qiang Niu, Pengfei Zhang, Sheng Dai
Summary: Tuning surface oxygen vacancies in oxide catalysts is crucial, and this study introduces a novel approach of engineering configurational entropy to enhance the concentration of oxygen vacancies. By synthesizing high-entropy oxides, it was demonstrated that they possess a higher concentration of oxygen vacancies and exhibit lower reduction temperatures of transition metal ions compared to single or binary oxides. Additionally, high-entropy oxides showed higher catalytic activity in CO/C3H6 oxidation, supporting the hypothesis from DFT calculations and suggesting their potential as superior oxide catalysts with preferred oxygen vacancies.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Mengyuan Zhang, Xiaolan Duan, Ying Gao, Shuangshuang Zhang, Xiaoyan Lu, Kongliang Luo, Jian Ye, Xiaopeng Wang, Qiang Niu, Pengfei Zhang, Sheng Dai
Summary: This study proposes a principle of utilizing configurational entropy to tune oxygen vacancies and demonstrates its feasibility through experiments. The research finds that using high-entropy oxides as catalysts can achieve higher concentrations of oxygen vacancies and lower reduction temperatures of transition metal ions, thereby enhancing catalytic activity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Multidisciplinary
P. L. Krapivsky, J. M. Luck
Summary: We present a new method, based on renewal processes theory, to calculate the configurational entropy of constrained configurations of particles on a one-dimensional lattice. This method is suitable for local rules involving cluster lengths of occupied and empty sites, and it is more systematic and easier to implement compared to the transfer-matrix approach. We provide detailed illustrations using the k-mer deposition model and ensembles of trapped Rydberg atoms with blockade range b.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Chemistry, Multidisciplinary
Rongkai Kang, Dongmei Zhang, Yiqun Du, Chenyi Sun, Wei Zhou, Han Wang, Jiaqi Wan, Guowen Chen, Jianxin Zhang
Summary: A high configurational entropy strategy is employed to enhance the electrochemical properties of rechargeable aluminum batteries (RABs) for the first time. The high-entropy (Fe, Mn, Ni, Zn, Mg)3O4 cathode exhibits ultra-stable cycling ability, high specific capacity, and rapid ion diffusion. The oxygen vacancies in the cathode contribute to adjusting the distribution of electronic states, enhancing the reaction kinetics at the electrolyte and cathode interface.
Article
Chemistry, Inorganic & Nuclear
Xun Kang, Alexei A. Belik, Yoshihiro Tsujimoto, Kazunari Yamaura
Summary: Under high-pressure and high-temperature conditions, doped Bi3Re3O11 and Bi3Re3O11 with Fe up to 29 atomic % were synthesized. The crystal structures and chemical compositions of Bi3Os2.45Fe0.55O11 and Bi3Re2.13Fe0.87O11 were determined by synchrotron powder X-ray diffraction and electron probe microanalysis. Both materials showed magnetic and electronic transport properties, indicating their potential for spintronic devices.
INORGANIC CHEMISTRY
(2022)
Review
Materials Science, Ceramics
Martina Fracchia, Mauro Coduri, Paolo Ghigna, Umberto Anselmi-Tamburini
Summary: This article discusses the research and applications of high-entropy oxides, and analyzes the reasons behind their stability. The article points out that the effective role of entropy in stabilization should be demonstrated for each system, and provides a guide to discern between entropy-stabilized and non-entropy-stabilized oxides.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Multidisciplinary Sciences
Haiqian Yang, Adrian F. Pegoraro, Yulong Han, Wenhui Tang, Rohan Abeyaratne, Dapeng Bi, Ming Guo
Summary: Cells cooperate as groups to achieve structure and function at the tissue level, with transformations in material characteristics essential for vital processes. Configurational fingerprints and order parameters are developed to quantify system disorder, forming a complete and unique pair for structural disorder in multicellular systems. Evolution of these order parameters offers a way to map phase transitions in expanding cell monolayers and during embryogenesis and invasion of epithelial spheroids.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Physical
Alexander A. Daykin, Sudhir Ravula, Helmut Kaiser, Tom Heitmann, L. D. Sanjeewa, Gary A. Baker, X. He, Alessandro R. Mazza, Paul F. Miceli
Summary: Functionalization of graphene can modify its physical properties and has broad application potential. However, the structural disorder of functionalized graphene is often overlooked and difficult to quantify. In this study, we used x-ray and neutron diffraction to quantitatively characterize hydrogenated graphene nanopowder, including its hydrogen content. Our results show that most of the sample consists of disordered carbon, while a small portion contains few-layered graphene. Our approach provides a quantitative method for understanding disorder and hydrogen bonding in carbon nanomaterials.
Article
Physics, Condensed Matter
Guixin Cao, Yakui Weng, Xinyu Yao, T. Zac Ward, Zheng Gai, David Mandrus, Shuai Dong
Summary: We investigate the magnetic and electronic transport properties of Mn-doped LaTi1-xMn(x)O3(x=0,0.1,0.3,0.5) as a function of temperature and an applied magnetic field. Magnetic transition is observed in the doped samples but not in the parent LaTiO3. Fluctuations in magnetization at low fields below the Neel transition temperature suggest electronic phase separation in the material. The increase in Mn content strengthens the ferromagnetic-like moment while maintaining the G-type antiferromagnetic phase through charge transfer and influence on orbital ordering.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Zilong Wang, Wenrui Zhang, Yang Song, Ningtao Liu, Li Chen, Na An, Deyu Liu, Qitao Liu, Shengcheng Shen, Yongbo Kuang, Jichun Ye
Summary: This study explores the impact of site-selective doping on the structural variation and electron transport in BVO, as well as its implications for designing photoanodes with improved PEC performance. Two types of doped BVO films, with V site substituted with Mo ions or Bi site substituted with Gd ions, are prepared and compared to pristine BVO. It is suggested that Gd-Bi doping facilitates carrier transport through introducing structural distortion and increasing the oxygen vacancy concentration, while MoV doping enhances the donor density and facilitates carrier hopping.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Ruihao Yuan, Abinash Kumar, Shihao Zhuang, Nicholas Cucciniello, Teng Lu, Deqing Xue, Aubrey Penn, Alessandro R. Mazza, Quanxi Jia, Yun Liu, Dezhen Xue, Jinshan Li, Jia-Mian Hu, James M. LeBeau, Aiping Chen
Summary: By using machine learning methods, we have achieved a slush-like polar state with fine domains of different ferroelectric polar phases, narrowing down the large combinatorial space of likely candidates. The formation of this state in cation-doped BaTiO3 films has been simulated and confirmed using phase field simulation and scanning transmission electron microscopy. This data-driven design recipe for a slush-like polar state can quickly optimize the functionalities of ferroelectric materials.
Article
Nanoscience & Nanotechnology
Alessandro R. R. Mazza, Elizabeth Skoropata, Jason Lapano, Michael A. A. Chilcote, Cameron Jorgensen, Nan Tang, Zheng Gai, John Singleton, Matthew J. J. Brahlek, Dustin A. A. Gilbert, Thomas Z. Z. Ward
Summary: By designing magnetic frustration in structurally single crystal films, exchange bias and antiferromagnetic spin reversal can be achieved without the need for complex heterostructures and nanocomposites. Through hole doping of high entropy perovskite oxides, magnetic responses can be tuned and highly tunable exchange bias can be created.
Article
Chemistry, Physical
Yuxia Yang, Liu Wang, Shudong Hu, Dongyang Han, Simiao Wu, Zilong Wang, Wenrui Zhang, Jichun Ye
Summary: Ternary complex oxides show significant dependence on structure and functionalities based on their composition. The effect of cation stoichiometry on the physical properties of ZnGa2O4 is well known, but its impact on ultraviolet photodetection behavior is not clear. In this study, a combinatorial pulsed laser deposition technique is used to create graded composition in ZnxGa1-xO films, and their effects on phase, crystallinity, and bandgap are investigated. The photodetection performance is compared by fabricating metal-semiconductor-metal (MSM) photodetectors. The study reveals the optimal compositional range for the best device performance and sheds light on composition-dependent evolution in ultrawidebandgap semiconductors for high-performance ultraviolet photodetection.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Applied
Jinfu Zhang, Ningtao Liu, Wenrui Zhang, Jichun Ye
Summary: La-doped BaSnO3 (BLSO) has potential applications in oxide electronic devices due to its high electron mobility and good thermal stability. The interaction between extrinsic La dopants and intrinsic oxygen vacancies in BLSO films influences the transport behavior, but the dominant factor is unclear when the La dopant ratio varies. In this study, BLSO films with lightly doped (0.2%) and heavily doped (7%) regimes were fabricated, and the impact of oxygen vacancies on the structure, optical, and transport properties of these films was investigated systematically. The presence of ozone during film growth resulted in larger strain and lower oxygen vacancy concentrations, as well as decreased mobility and carrier concentration for both lightly doped and heavily doped films. These findings indicate that oxygen vacancies enhance carrier concentration and electron mobility independent of the La dopant ratio and provide an effective strategy for optimizing the electrical properties of BLSO films.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Wenrui Zhang, Wei Wang, Jingxuan Wei, Shihong Xia, Jianguo Zhang, Li Chen, Dongyang Han, Keming Jiang, Zhenhai Yang, Shen Hu, Li Ji, Jichun Ye
Summary: In this study, we integrate an ultrathin Al2O3 capping layer to improve the performance of ε-Ga2O3 MSM photodetectors. The Al2O3 layer effectively reduces the dark current, increases the photocurrent and response speed. The surface passivation mechanism involves the reduction of surface defects and the reconstruction of a faster surface transport channel. The Al2O3/ε-Ga2O3 MSM photodetector achieves high responsivity, detectivity, photo-to-dark ratio, and UV-vis rejection ratio.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zeeshan Ali, Zhen Wang, Alessandro R. Mazza, Mohammad Saghayezhian, Roshan Nepal, Thomas Z. Ward, Yimei Zhu, Jiandi Zhang
Summary: We demonstrate continuous tuning of crystal symmetry from orthorhombic to tetragonal in perovskite ruthenates by substituting strontium with barium. The substitution not only changes the magnetic properties, but also tunes the perpendicular magnetic anisotropy and eliminates RuO6 rotational distortions. Further substitution enhances the tetragonal distortion and suppresses ferromagnetism by controlling the Ru-4d orbital occupancy. These results show that isovalent substitution significantly impacts the electronic and magnetic properties of perovskite oxides.
Article
Physics, Multidisciplinary
Alessandro R. Mazza, Shree Ram Acharya, Patryk Wasik, Jason Lapano, Jiemin Li, Brianna L. Musico, Veerle Keppens, Christopher T. Nelson, Andrew F. May, Matthew Brahlek, Claudio Mazzoli, Jonathan Pelliciari, Valentina Bisogni, Valentino R. Cooper, T. Zac Ward
Summary: Perovskite nickelates exhibit a strong connection between structural, electronic, and magnetic orders. This study investigates the impact of crystal-field disorder induced by cation size variance on the emergence of macroscopic magnetic, structural, and electronic behaviors in high-entropy oxide nickelate films. It is found that the degree of variation in cation sizes strongly affects critical ordering temperatures. Resonant x-ray scattering and density functional theory explain how high-variance systems can manipulate charge disproportionation through local lattice distortions, allowing for the stabilization of room-temperature ordered phases not seen in low-variance ternary compounds.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Applied
Dongyang Han, Yuxia Yang, Lin Meng, Shudong Hu, Kaisen Liu, Haobo Lin, Ningtao Liu, Wenrui Zhang, Jichun Ye
Summary: In this paper, a self-powered solar-blind UV photodetector based on a 4H-SiC/ZnGa2O4 heterojunction is demonstrated, along with its application in optical communication. The device shows excellent performance, mainly attributed to the characteristics of the 4H-SiC/ZnGa2O4 heterojunction.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Pinku Roy, Di Zhang, Alessandro R. Mazza, Nicholas Cucciniello, Sundar Kunwar, Hao Zeng, Aiping Chen, Quanxi Jia
Summary: Topologically protected non-trivial spin textures give rise to novel phenomena, such as the topological Hall effect. This study investigates the Hall effect in SrRuO3/La0.42Ca0.58MnO3 bilayers and finds that the proximity effect of LCMO plays a critical role. The reduction in SRO thickness enhances THE-like features.
