نتایج جستجو برای: transition metal oxides

تعداد نتایج: 451996  

2015
Yan Wang Jin Guo Tingfeng Wang Junfeng Shao Dong Wang Ying-Wei Yang

Recently, transition metal oxides, such as ruthenium oxide (RuO₂), manganese dioxide (MnO₂), nickel oxides (NiO) and cobalt oxide (Co₃O₄), have been widely investigated as electrode materials for pseudo-capacitors. In particular, these metal oxides with mesoporous structures have become very hot nanomaterials in the field of supercapacitors owing to their large specific surface areas and suitab...

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Journal: :international journal of nano dimension 0
saeed farhadi department of chemistry, lorestan university, khoramabad 68135-465, iranسازمان اصلی تایید شده: دانشگاه لرستان (lorestan university) gholamali nadri department of chemistry, lorestan university, khoramabad 68135-465, iranسازمان اصلی تایید شده: دانشگاه لرستان (lorestan university) masoumeh javanmard department of chemistry, lorestan university, khoramabad 68135-465, iranسازمان اصلی تایید شده: دانشگاه لرستان (lorestan university)

in this paper, an energetic coordination compound namely pentamminenitratocobalt(iii) nitrate, [co(nh3)5(no3)](no3)2, was used as a new precursor for the preparation of co3o4 nanoparticles. the results showed that the complex is easily decomposed into the co3o4 nanoparticles at low temperature (200 °c) without employing a surfactant or solvent and any complicated equipment. the product was char...

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Journal: :Physical review letters 2001
J Burgy M Mayr V Martin-Mayor A Moreo E Dagotto

The influence of quenched disorder on the competition between ordered states separated by a first-order transition is investigated. A phase diagram with features resembling quantum-critical behavior is observed, even using classical models. The low-temperature paramagnetic regime consists of coexisting ordered clusters, with randomly oriented order parameters. Extended to manganites, this state...

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2017
Denis A. Kuznetsov Binghong Han Yang Yu Reshma R. Rao Jonathan Hwang Yuriy Román-Leshkov Yang Shao-Horn

Context & Scale This review aims to bridge the fields of inorganic molecular chemistry, electrocatalysis, lithium-ion batteries, and chemical physics of oxides by introducing a unifying concept linking the electronic structures and electrochemical properties of transition metal oxides and complexes. In this work, by reviewing broad literature on the redox behavior of a number of Ni, Co, Fe, and...

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2017
Huigang Zhang Hailong Ning John Busbee Zihan Shen Chadd Kiggins Yuyan Hua Janna Eaves Jerome Davis Tan Shi Yu-Tsun Shao Jian-Min Zuo Xuhao Hong Yanbin Chan Shuangbao Wang Peng Wang Pengcheng Sun Sheng Xu Jinyun Liu Paul V Braun

Materials synthesis often provides opportunities for innovation. We demonstrate a general low-temperature (260°C) molten salt electrodeposition approach to directly electroplate the important lithium-ion (Li-ion) battery cathode materials LiCoO2, LiMn2O4, and Al-doped LiCoO2. The crystallinities and electrochemical capacities of the electroplated oxides are comparable to those of the powders sy...

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2015
Kei Hirai Daisuke Kan Noriya Ichikawa Ko Mibu Yoshitaka Yoda Marina Andreeva Yuichi Shimakawa

Oxygen coordination of transition metals is a key for functional properties of transition-metal oxides, because hybridization of transition-metal d and oxygen p orbitals determines correlations between charges, spins and lattices. Strain often modifies the oxygen coordination environment and affects such correlations in the oxides, resulting in the emergence of unusual properties and, in some c...

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Journal: :Science 2005
Elbio Dagotto

A wide variety of experimental results and theoretical investigations in recent years have convincingly demonstrated that several transition metal oxides and other materials have dominant states that are not spatially homogeneous. This occurs in cases in which several physical interactions-spin, charge, lattice, and/or orbital-are simultaneously active. This phenomenon causes interesting effect...

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2015
Le Wang Sheng Ju Lu You Yajun Qi Yu-wei Guo Peng Ren Yang Zhou Junling Wang

Transition metal oxides host an array of exotic electronic phases, including superconductivity, ferroelectricity, quantum spin liquid and Mott insulators. Their extreme sensitivity to external stimuli enables various routes to manipulate the ground state, which greatly improves our understanding of the physics involved. Here, we report the competition between strain and dimensionality effects o...

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Journal: :Acta crystallographica. Section B, Structural science 2004
Michael W Lufaso Patrick M Woodward

In transition metal oxides, preferential occupation of specific d orbitals on the transition metal ion can lead to the development of a long-range ordered pattern of occupied orbitals. This phenomenon, referred to as orbital ordering, is usually observed indirectly from the cooperative Jahn-Teller distortions (CJTDs) that result as a consequence of the orbital ordering. This paper examines the ...

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2017
Carla Verdi Fabio Caruso Feliciano Giustino

Transition metal oxides host a wealth of exotic phenomena ranging from charge, orbital and magnetic order to nontrivial topological phases and superconductivity. In order to translate these unique materials properties into device functionalities these materials must be doped; however, the nature of carriers and their conduction mechanism at the atomic scale remain unclear. Recent angle-resolved...

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