Al2O3 triggered in-situ crystallization of Gd3Al2Ga3O12 in glass and enhancement in magnetic and Faraday rotating properties |
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| Affiliation: | 1. Inner Mongolia Key Laboratory of Thin Film and Coatings, School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;2. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 430081 Wuhan, PR China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, 430081 Wuhan, PR China;1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Fraunhofer IWM, 79108 Freiburg, Germany;3. Institute for Applied Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;4. Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada;1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China;2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;3. Lanzhou Institute of Physics, Lanzhou 730000, China;4. Institute of Science and Technology of 404 Company Limited, China National Nuclear Corporation, Jiayuguan 735100, China;1. CIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, Spain;2. Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, Spain |
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| Abstract: | Nanocrystals doped transparent glasses or glass ceramics have shown promising tunable magnetic and magneto-optical performance. In this study, the Al2O3-induced in-situ crystallization of Gd3Al2Ga3O12 in tellurite glass was reported. 10–20 nm-cubic Gd3Al2Ga3O12 (Ia3d space group) nanocrystals formed in tellurite glass with Al2O3 content ≤ 0.75 mol% by 400 °C-heat treatment. When Al2O3 content in glass was higher than 0.75 mol%, excessive Al2O3 triggered the crystallization of orthorhombic GdAlO3 (Pnma) in which the Gd and Al ions existed as octahedral GdO8 and AlO6 units at a temperature higher than 398 °C. The in-situ crystallization influenced the glass network structure, broke the linkage of tetrahedral TeO4, and BO4, and formed trigonal pyramids TeO3 and BO3 instead. At the same time, nuclear magnetic resonance spectra revealed the conversion of AlO4→ AlO6, GaO4→ GaO6, and the changes from bridging oxygen to non-bridging oxygen as well. From energy-dispersive X-Ray analysis, Gd3+ clusters were observed, leading to the ferromagnetism of glass. Electron paramagnetic resonance spectra witnessed an enhancement of the Zeeman effect which is the reason for the improvement of Faraday rotation. Tellurite glass with 0.75 mol% Al2O3 after 400 °C-annealing (A75) showed a giant Verdet constant of 93 rad/T.m at 633 nm which is superior to most of the values from the literature. |
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| Keywords: | Magnetic Property Faraday rotation Crystallization |
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