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Valence (chemistry)

About: Valence (chemistry) is a research topic. Over the lifetime, 24937 publications have been published within this topic receiving 645252 citations. The topic is also known as: valency.


Papers
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Journal ArticleDOI
TL;DR: The crystal chemistry of ternary equiatomic europium compounds EuTX (T = transition metal; X = element of the III, IV, or V main group) is reviewed in this article.
Abstract: The crystal chemistry of ternary equiatomic europium compounds EuTX (T = transition metal; X = element of the III, IV, or V main group) is reviewed. Besides preparation techniques we have especially focused on the structure−property relationships and peculiarities in chemical bonding. A main interest in these compounds is the valence state of the europium atoms. The magnetic susceptibility and electrical conductivity data, 151Eu Mossbauer spectroscopic results and LIII X-ray absorption experiments are discussed in detail.

109 citations

Journal ArticleDOI
TL;DR: The molecular connectivity valence delta-values have been defined in terms of the count of nonhydrogen valence electrons on a valence-state atom as screened from the nucleus by the core electrons, and it is found that a second variable, the number of alpha hydrogen atoms, greatly increases the quality of the correlation.

108 citations

Journal ArticleDOI
TL;DR: In this article, electron energy loss spectroscopy was used to explore the adatom valence electron structure and charging and the observed shifts of the Na2p and K3p core level excitation thresholds are consistent with these charge assignments.

108 citations

Journal ArticleDOI
TL;DR: In this article, the orthogonalized plane wave method is applied to the zinc-blende lattice and crystal symmetrized combinations of plane waves are constructed for the zincblende, and the electronic levels at symmetry points of the reduced zone are derived as explicit functions of parameters depending on the crystal potential and on the core eigenstates.
Abstract: The orthogonalized plane wave method is applied to the zincblende lattice. Crystal symmetrized combinations of plane waves are constructed for the zincblende lattice and the secular equations for the electronic levels at symmetry points of the reduced zone are derived as explicit functions of parameters depending on the crystal potential and on the core eigenstates. Calculations of valence and conduction eigenvalues and eigenfunctions are carried out on a number of group IV elements and of III-V compounds starting from the Hartree-Fock atomic core states and a model crystal potential constructed as a sum of atomic potentials in which the Slater approximation is used for the exchange contribution. The resulting band structures are very similar for all the semiconductors considered and the sequence of electronic levels confirms previous qualitative analyses. A comparison with experiments reveals, however, that those $s$-like conduction states which are most sensitive to the crystal potential are too high with respect to the other conduction states in the present approximation. An analysis of the approximation used indicates that the largest error in the calculations comes from the use of the Slater exchange in the model potential. Ways of improving on the accuracy of the calculations are suggested; one way is to use Hartree-Fock-Slater atomic results as a starting point. It is shown for the case of germanium that this improvement brings the results for the $s$-like conduction states into a closer agreement with experiment.

108 citations

Journal ArticleDOI
TL;DR: In this paper, the silicon-rich side of the YbSi system has been examined and a new phase Yb3Si5, not previously known, has been found.
Abstract: The silicon-rich side of the YbSi system has been examined and a new phase Yb3Si5, not previously known, has been found. X-ray analysis, magnetic susceptibility measurements and linear expansion coefficients indicate that the two phases richest in silicon, YbSi1.8 (AlB2 type) and Yb3Si5 (Th3Pd5 type), correspond to two new temperature-induced valence fluctuation compounds.

108 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,521
20222,997
2021616
2020611
2019584
2018577