Spontaneous growth of arsenic oxide micro-crystals on chemically etched MnAs surfaces
| Autor: | Yukihiko Takagaki, K. H. Ploog, E. Wiebicke, Lutz Däweritz, M. Ramsteiner |
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| Rok vydání: | 2003 |
| Předmět: |
inorganic chemicals
Materials science fungi Inorganic chemistry technology industry and agriculture chemistry.chemical_element macromolecular substances General Chemistry engineering.material Isotropic etching law.invention Amorphous solid Crystal symbols.namesake stomatognathic system chemistry Arsenolite law engineering symbols General Materials Science Arsenic oxide Crystallization Raman spectroscopy Arsenic |
| Zdroj: | Applied Physics A: Materials Science & Processing. 76:837-840 |
| ISSN: | 1432-0630 0947-8396 |
| Popis: | Micrometer-size crystals are observed to grow spontaneously on chemically etched MnAs surfaces. The wet chemical etching leaves a nearly exclusive pile of amorphous arsenic on the surface when the MnAs layer is etched incompletely. Using Raman spectroscopy, we identify that these micro-crystals are the arsenolite crystal of arsenic oxides. The manganese in the MnAs layer is oxidized by the hydrogen peroxide in the etch solution to MnO2, which then works as the catalyst for the rapid oxidation and crystallization of the amorphous arsenic. |
| Databáze: | OpenAIRE |
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