Barium in High Oxidation States in Pressure-Stabilized Barium Fluorides
| Autor: | Dongbao Luo, Yanchao Wang, Guochun Yang, Yanming Ma |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
chemistry.chemical_element Barium 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal Crystallography General Energy chemistry Oxidation state visual_art Fluorine visual_art.visual_art_medium Reactivity (chemistry) Physical and Theoretical Chemistry 0210 nano-technology Valence electron Open shell Ambient pressure |
| Zdroj: | The Journal of Physical Chemistry C. 122:12448-12453 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The oxidation state of an element influences its chemical behavior of reactivity and bonding. Finding unusual oxidation state of elements is a theme of eternal pursuit. As labeled by an alkali-earth metal, barium (Ba) invariably exhibits an oxidation state of +2 by a loss of two 6s valence electrons while its inner 5p closed shell is known to remain intact. Here, we show through the reaction with fluorine (F) at high pressure that Ba exhibits a hitherto unexpected high oxidation state greater than +2 in three pressure-stabilized F-rich compounds BaF3, BaF4, and BaF5, where Ba takes on the role of a 5p element by opening up its inert 5p shell. Interestingly enough, these pressure-stabilized Ba fluorides share common structural features of Ba-centered polyhedrons but exhibit a diverse variety of electronic properties showing semiconducting, metallic, and even magnetic behaviors. Our work modifies the traditional knowledge on the chemistry of alkali-earth Ba element established at ambient pressure and highli... |
| Databáze: | OpenAIRE |
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