Topic
Valency
About: Valency is a research topic. Over the lifetime, 1632 publications have been published within this topic receiving 26141 citations.
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TL;DR: Using powerful crystallographic and spectroscopic techniques, a rich variety of temperature- and pressure-driven abrupt or continuous valence transitions are found—the electronically active fulleride sublattice acts as an electron reservoir that can accept electrons from or donate electrons to the rare-earth 4f/5d bands, thereby sensitively modulating the valence of the rare.
Abstract: Mixed-valence phenomena associated with the highly correlated narrow-band behaviour of the 4f electrons in rare earths are well documented for a variety of rare-earth chalcogenides, borides and intermetallics (Kondo insulators and heavy fermions). The family of rare-earth fullerides with stoichiometry RE2.75C60 (REZSm, Yb, Eu) also displays an analogous phenomenology and a remarkable sensitivity of the rare-earth valency to external stimuli (temperature and pressure) making them the first known molecular-based members of this fascinating class of materials. Using powerful crystallographic and spectroscopic techniques which provide direct indications of what is happening in these materials at the microscopic level, we find a rich variety of temperature- and pressure-driven abrupt or continuous valence transitions—the electronically active fulleride sublattice acts as an electron reservoir that can accept electrons from or donate electrons to the rare-earth 4f/5d bands, thereby sensitively modulating the valence of the rare-earth sublattice.
6 citations
TL;DR: In this article, the preparation of large single-domain, optically homogeneous iron-doped KNbO3 crystals is described, and different methods of influencing the iron valency are compared.
Abstract: The preparation of large single-domain, optically homogeneous iron-doped KNbO3 crystals is described. Different methods of influencing the iron valency are compared.
6 citations
6 citations
01 Jan 2018
TL;DR: A complete, automated, and efficient approach for utilizing valency analysis in making dependency parsing decisions, which includes extraction of valency patterns, a probabilistic model for tagging these patterns, and a joint decoding process that explicitly considers the number and types of each token’s syntactic dependents.
Abstract: We present a complete, automated, and efficient approach for utilizing valency analysis in making dependency parsing decisions It includes extraction of valency patterns, a probabilistic model for tagging these patterns, and a joint decoding process that explicitly considers the number and types of each token’s syntactic dependents On 53 treebanks representing 41 languages in the Universal Dependencies data, we find that incorporating valency information yields higher precision and F1 scores on the core arguments (subjects and complements) and functional relations (eg, auxiliaries) that we employ for valency analysis Precision on core arguments improves from 8087 to 8543 We further show that our approach can be applied to an ostensibly different formalism and dataset, Tree Adjoining Grammar as extracted from the Penn Treebank; there, we outperform the previous state-of-the-art labeled attachment score by 07 Finally, we explore the potential of extending valency patterns beyond their traditional domain by confirming their helpfulness in improving PP attachment decisions
6 citations