Exploration into the Syntheses of Gallium‐ and Indiumborates under Extreme Conditions: M5B12O25(OH): Structure,Luminescence, and Surprising Photocatalytic Properties |
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Authors: | Daniela Vitzthum Dr Klaus Wurst Johann M Pann Prof?Dr Peter Brüggeller Dr Markus Seibald Prof?Dr Hubert Huppertz |
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Institution: | 1. Institut für Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universit?t Innsbruck, Innsbruck, Austria;2. OSRAM Opto Semiconductors GmbH, Schwabmünchen, Germany |
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Abstract: | Explorative solid‐state chemistry led to the discovery of the two new compounds Ga5B12O25(OH) and In5B12O25(OH). Extreme synthetic conditions within the range of 12 GPa and a temperature of 1450 °C realized in a Walker‐type multianvil apparatus resulted in the formation of an unprecedented tetragonal structure with the exclusive presence of condensed BO4 tetrahedra, forming cuboctahedral cavities. Doping of these cavities with Eu3+ in In5B12O25(OH) yielded in an orange–red luminescence. Photocatalytic tests of In5B12O25(OH) revealed a hydrogen production rate comparable to TiO2 but completely co‐catalyst free. |
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Keywords: | borates high-pressure synthesis luminescence photocatalytic hydrogen production structure elucidation |
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