First ZnGa2O4 transparent ceramics |
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Authors: | Claire Mével Julie Carreaud Gaëlle Delaizir Jean-René Duclère François Brisset Julie Bourret Pierre Carles Cécile Genevois Mathieu Allix Sébastien Chenu |
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Affiliation: | 1. Institut de Recherche sur les Céramiques (IRCER), UMR 7315 CNRS, Université de Limoges, Centre Européen de la Céramique, Limoges, France;2. Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), UMR 8182 CNRS, Orsay, France;3. CNRS, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI) UPR3079, Univ. Orléans, F-45071, Orléans, France |
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Abstract: | Transparent polycrystalline ZnGa2O4 ceramics are synthesized, for the first time, by combining high-energy ball milling, solid-state reaction and spark plasma sintering. They appear transparent in both the visible and near infrared (up to 9 μm) ranges after a post-SPS annealing in air converting the raw semiconductor into an electrical insulator. The maximum of transmittance is reached in the near infrared region, at around 2.5 μm, with a value of 78 % (1 mm thick sample) close to the maximum value of transmittance previously measured for single crystals. These transparent ceramics present a classic cubic spinel ZnGa2O4 structure and a dense microstructure (> 99 %) attained without sintering aids, with an average grain size of 600 nm and a random orientation of the crystallites. TEM observations performed on thin foils have revealed limited nanometer scale intergranular porosity which does not affect much the transparency. As a proof of interest, red long-lasting luminescence arising from the entire sample volume is observed in these Cr3+ doped transparent ceramics. This innovative work is anticipated to further drive the development of transparent ZnGa2O4 ceramics towards a wider range of performing optical applications such as laser emission. |
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Keywords: | STEM-HAADF Microstructure SPS sintering Red persistent luminescence |
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