Observation of chemical reactions between alkaline-earth oxides and tungsten at high pressure and high temperature |
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Authors: | Daniel Errandonea |
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Institution: | MALTA Consolider Team, Departamento de Física Aplicada-ICMUV, Fundación General de la Universidad de Valencia, C/Dr. Moliner 50, 46100 Burjassot, Spain |
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Abstract: | The potential chemical reactions of alkaline-earth oxides (AeO with Ae: Mg, Ca, Sr, and Ba) and tungsten are studied at high pressure and high temperature. At pressures ranging from 5 to 10 GPa and temperatures of 2000 K, a noticeable reaction between AeO and powder tungsten (W) was detected. As a product of the reaction, scheelite-structured orthotungstates (AeWO4) were formed. The reactivity of alkaline-earth oxides with tungsten increases in the order Ca<Sr<Ba, being the reaction not detected for MgO. Possible chemical reactions leading to the formation of alkaline-earth orthotungstates have been considered. Our results support the conclusion that the most probable reaction occurring under high-pressure and high-temperature conditions is AeO+W+3/2 O2→AeWO4. |
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Keywords: | 62 50 &minus p 81 05 Je 82 33 Pt |
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