High temperature reactions between molybdenum and metal halides
| Autor: | Gábor Dobos, Gy. Hárs, V.K. Josepovits, Agoston Boroczki |
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| Rok vydání: | 2006 |
| Předmět: |
Gas-discharge lamp
Chemistry Inorganic chemistry Analytical chemistry General Physics and Astronomy Halide chemistry.chemical_element Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Corrosion law.invention chemistry.chemical_compound Metal halides X-ray photoelectron spectroscopy Transition metal law Molybdenum Atomic absorption spectroscopy |
| Zdroj: | Applied Surface Science. 252:8309-8313 |
| ISSN: | 0169-4332 |
| Popis: | Good colour rendering properties, high intensity and efficacy are of vital importance for high-end lighting applications. These requirements can be achieved by high intensity discharge lamps doped with different metal halide additives (metal halide lamps). To improve their reliability, it is very important to understand the different failure processes of the lamps. In this paper, the corrosion reactions between different metal halides and the molybdenum electrical feed-through electrode are discussed. The reactions were studied in the feed-through of real lamps and on model samples too. X-ray photoelectron spectroscopy (XPS) was used to establish the chemical states. In case of the model samples we have also used atomic absorption spectroscopy (AAS) to measure the reaction product amounts. Based on the measurement results we were able to determine the most corrosive metal halide components and to understand the mechanism of the reactions. |
| Databáze: | OpenAIRE |
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