scholarly journals Can Empirical Biplots Predict High Entropy Oxide Phases?

2021 ◽  
Vol 5 (12) ◽  
pp. 311
Author(s):  
Zhaoyuan Leong ◽  
Pratik Desai ◽  
Nicola Morley
Keyword(s):  
Composite Structures ◽  
Voronoi Tessellation ◽  
Material Interfaces ◽  
Test Dataset ◽  
Atom Ratio ◽  
High Entropy ◽  
New Class ◽  
Stability Maps ◽  
Oxide Phases ◽  
Real World Problems

High entropy oxides are entropy-stabilised oxides that adopt specific disordered structures due to entropy stabilisation. They are a new class of materials that utilises the high-entropy concept first discovered in metallic alloys. They can have interesting properties due to the interactions at the electronic level and can be combined with other materials to make composite structures. The design of new meta-materials that utilise this concept to solve real-world problems may be a possibility but further understanding of how their phase stabilisation is required. In this work, biplots of the composition’s mean electronegativity are plotted against the electron-per-atom ratio of the compounds. The test dataset accuracy in the resulting biplots improves from 78% to 100% when using atomic-number-per-atom Z/a ratios as a biplot parameter. Phase stability maps were constructed using a Voronoi tessellation. This can be of use in determining stability at composite material interfaces.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

Layered High-Entropy Oxide Structures for Reversible Energy Storage

2020 ◽  
Author(s):  
Junbo Wang ◽  
Yanyan Cui ◽  
Qingsong Wang ◽  
Kai Wang ◽  
Xiaohui Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Cathode Material ◽  
Spray Pyrolysis ◽  
Lattice Structure ◽  
Oxide Materials ◽  
High Entropy ◽  
New Class ◽  
Nebulized Spray Pyrolysis

<p>Layered Li<i><sub>x</sub></i>MO<sub>2</sub> materials, a new class of high-entropy oxides, have been synthesized by nebulized spray pyrolysis. Specifically, the lattice structure of Li(Ni<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>)O<sub>2</sub> (NCM111) cathode material has been replicated successfully while increasing the number of cations in equimolar proportions, thereby allowing transition to high-entropy oxide materials.</p>

scholarly journals New high-entropy oxide phases with the magnetoplumbite structure

2021 ◽  
Vol 1014 (1) ◽  
pp. 012062
Author(s):  
V E Zhivulin ◽  
E A Trofimov ◽  
A Yu Starikov ◽  
S A Gudkova ◽  
A Yu Punda ◽  
...  
Keyword(s):  
High Entropy ◽  
Oxide Phases

A promising new class of irradiation tolerant materials: Ti2ZrHfV0.5Mo0.2 high-entropy alloy

2019 ◽  
Vol 35 (3) ◽  
pp. 369-373 ◽  
Author(s):  
Yiping Lu ◽  
Hefei Huang ◽  
Xuzhou Gao ◽  
Cuilan Ren ◽  
Jie Gao ◽  
...  
Keyword(s):  
High Entropy Alloy ◽  
High Entropy ◽  
New Class

High-entropy oxide phases with magnetoplumbite structure

2019 ◽  
Vol 45 (10) ◽  
pp. 12942-12948 ◽  
Author(s):  
D.A. Vinnik ◽  
E.A. Trofimov ◽  
V.E. Zhivulin ◽  
O.V. Zaitseva ◽  
S.A. Gudkova ◽  
...  
Keyword(s):  
High Entropy ◽  
Oxide Phases

Introducing “Advanced” Tuned Vibration Absorbers in an Undergraduate Vibrations Course

2005 ◽  
Author(s):  
Jeong-Hoi Koo ◽  
Fernando Goncalves ◽  
Hong Zhang
Keyword(s):  
Undergraduate Students ◽  
Smart Materials ◽  
Engineering Students ◽  
Primary Objective ◽  
Vibration Absorbers ◽  
Active Materials ◽  
New Class ◽  
Undergraduate Engineering ◽  
Tuned Vibration Absorbers ◽  
Real World Problems

The primary objective of this paper is to bridge the theory of tuned vibration absorbers (TVA) with the practice of implementing TVAs in systems. Often, the practice of implementing TVAs in systems is a far departure from the theory expressed in many textbooks. These departures are often required in practice to account for the less than ideal conditions that the TVAs will be operating under. Many retrofitted TVAs use “smart” or active materials along with various control techniques to improve the performance of the traditional TVA proposed in textbooks. The intent of the current paper is to demonstrate several of these modern methods of implementing retrofitted TVAs to undergraduate students. The first author introduced the methods in a junior level vibrations course, and is developing a laboratory experiment. Teaching these advanced TVAs to undergraduate engineering students will help them understand how theories learned in class are used in real world problems, and motivate them to explore new fields of research. After introducing a “textbook” vibration absorber theory, this paper describes principles and operations of a new class of vibration absorbers. In reviewing conventional TVAs, students are introduced to many of the engineering challenges encountered in the implementation of TVAs. One such challenge is inevitable off-tuning caused by system parameter changes with time. After identifying many of the challenges associated with the implementation of TVAs, the students are introduced to many modern solutions to these problems. Many of these solutions involve the use of smart materials, such as piezoceramics, magnetorheological fluids, magnetorheological elastomers, shape memory alloys, etc. Through this experience, students are introduced to many smart materials and have the opportunity to see how these smart materials can provide solutions to many engineering challenges and improve existing technologies.

scholarly journals A New Class of the Planar Networks with High Clustering and High Entropy

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Guona Hu ◽  
Yuzhi Xiao ◽  
Huanshen Jia ◽  
Haixing Zhao
Keyword(s):  
High Entropy ◽  
New Class ◽  
Planar Networks

scholarly journals HIGH-ENTROPY ALLOYS AS A PROSPECTIVE CLASS OF NEW RADIATION-TOLERANT MATERIALS RESEARCH DEVELOPMENT ANALYSIS BASED ON THE INFORMATION DATABASES

2021 ◽  
pp. 3-15
Author(s):  
A.V. Levenets ◽  
M.A. Tikhonovsky ◽  
V.N. Voyevodin ◽  
A.G. Shepelev ◽  
O.V. Nemashkalo
Keyword(s):  
Radiation Damage ◽  
Exponential Growth ◽  
High Entropy Alloys ◽  
Research Development ◽  
Metallic Materials ◽  
High Entropy ◽  
New Class ◽  
Materials Research ◽  
Development Analysis ◽  
Radiation Tolerant

A new class of metallic materials, so-called “high-entropy alloys” (HEAs), was under review. Various definitions of these alloys are given, their main differences from the conventional alloys are indicated and the dynamics of publications in the period from the first publications in 2004 to the end of 2020 are presented. It is noted the almost exponential growth of the article numbers concerning these alloys, and the main reasons of such high interest are discussed. Experimental results of development the radiation-tolerant materials based on the concept of high-entropy alloys and study of the radiation damage mechanisms are summarised.

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