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Transition metal

About: Transition metal is a(n) research topic. Over the lifetime, 29832 publication(s) have been published within this topic receiving 782286 citation(s). The topic is also known as: transition element.
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Journal ArticleDOI
11 Feb 2000-Science
TL;DR: Zener's model of ferromagnetism, originally proposed for transition metals in 1950, can explain T(C) of Ga(1-)(x)Mn(x)As and that of its II-VI counterpart Zn(1)-Mn (x)Te and is used to predict materials with T (C) exceeding room temperature, an important step toward semiconductor electronics that use both charge and spin.
Abstract: Ferromagnetism in manganese compound semiconductors not only opens prospects for tailoring magnetic and spin-related phenomena in semiconductors with a precision specific to III-V compounds but also addresses a question about the origin of the magnetic interactions that lead to a Curie temperature (T(C)) as high as 110 K for a manganese concentration of just 5%. Zener's model of ferromagnetism, originally proposed for transition metals in 1950, can explain T(C) of Ga(1-)(x)Mn(x)As and that of its II-VI counterpart Zn(1-)(x)Mn(x)Te and is used to predict materials with T(C) exceeding room temperature, an important step toward semiconductor electronics that use both charge and spin.

6,798 citations


Journal ArticleDOI
01 May 1951-Physical Review
Abstract: Recently, Jonker and Van Santen have found an empirical correlation between electrical conduction and ferromagnetism in certain compounds of manganese with perovskite structure. This observed correlation is herein interpreted in terms of those principles governing the interaction of the $d$-shells of the transition metals which were enunciated in the first paper of this series. Both electrical conduction and ferromagnetic coupling in these compounds are found to arise from a double exchange process, and a quantitative relation is developed between electrical conductivity and the ferromagnetic Curie temperature.

4,843 citations


Journal ArticleDOI
Abstract: Samples of the iron oxides Fe0.94O, Fe3O4, Fe2O3, and Fe2SiO4 were prepared by high temperature equilibration in controlled gas atmospheres. The samples were fractured in vacuum and high resolution XPS spectra of the fractured surfaces were measured. The peak positions and peak shape parameters of Fe 3p for Fe2+ and Fe3+ were derived from the Fe 3p XPS spectra of the standard samples of 2FeO·SiO2 and Fe2O3, respectively. Using these parameters, the Fe 3p peaks of Fe3O4 and Fe1−yO are analysed. The results indicate that high resolution XPS techniques can be used to determine the Fe2+/Fe3+ ratios in metal oxides. The technique has the potential for application to other transition metal oxide systems.

3,366 citations


Journal ArticleDOI
09 Dec 2011-Science
TL;DR: The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an eg symmetry of surface transition metal cations in an oxide.
Abstract: The efficiency of many energy storage technologies, such as rechargeable metal-air batteries and hydrogen production from water splitting, is limited by the slow kinetics of the oxygen evolution reaction (OER). We found that Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3–δ (BSCF) catalyzes the OER with intrinsic activity that is at least an order of magnitude higher than that of the state-of-the-art iridium oxide catalyst in alkaline media. The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an e g symmetry of surface transition metal cations in an oxide. The peak OER activity was predicted to be at an e g occupancy close to unity, with high covalency of transition metal–oxygen bonds.

3,135 citations


Book
01 Jan 1973-
Abstract: (partial) The lanthanides, T Moeller. Carbonyls, cyanides, isocyanides and nitrosyls, W P Griffith. Compounds of the transitional elements involving metal-metal bonds, D L Kepert. Transition metal, J C Green & M V H Green. Nonstoichiometric compounds. An introductory essay, D J M Bevan. Tungsten bronzes, vanadium bronzes and related compounds, P Hagenmuller. Isopolyanions and Heteropolyanions, D L Kepert. Ionic compounds, G C Allen. Transition metal chemistry, B F G Johnson. Organo-transition metal compounds and related aspects of homogenous catalysis, B L Shaw & N I Tucker.

2,996 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202232
2021977
20201,123
20191,088
20181,086
2017936

Top Attributes

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Topic's top 5 most impactful authors

Wolfgang A. Herrmann

23 papers, 278 citations

Ernst Otto Fischer

16 papers, 52 citations

José Luis García Fierro

16 papers, 1K citations

Henri Brunner

15 papers, 342 citations

Gabor A. Somorjai

13 papers, 395 citations