Manufacture and Faraday magneto-optical effect of highly transparent novel holmium aluminum garnet ceramics. (1st April 2021)

• Record Type: Journal Article
• Authors: Wang, Mengyao; Lu, Bin
• Is Part Of: Scripta materialia. Number 195(2021)
• Publication Date: 2021-04-01
• Subjects: Transparent ceramics -- Holmium aluminum garnet -- Magneto-optical ceramics -- Sintering aid; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113729
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A novel transparent magneto-optical holmium aluminum garnet (HoAG) ceramic with a high in-line transmittance of ~80.3 % at 589 nm (~97.0 % of the theoretical transmittance of HoAG single crystal) and a maximal infrared cut-off at ~6.5 μm was successfully fabricated by vacuum sintering at 1650 °C. The facile co-precipitation strategy was employed to yield the precipitation precursor with hollow structures upon calcination into the sphere-like HoAG particle with a narrow particle distribution. Silica sintering aid creates point defect of Ho 3+ vacancies to promote the HoAG densification rate during sintering by Si 4+ substitution for Al 3+ in tetrahedrally coordinated 24 ( d ) sites. The magneto-optical HoAG ceramic has Verdet constants of ~-154 rad/(T·m) at 635 nm and ~-36 rad/(T·m) at 1064 nm, which are higher than or similar to that of the commercial TGG single crystal. The thermal conductivity of the transparent HoAG ceramic was determined to be ~10.5 W/(m·K) at room temperature. Graphical abstract: Image, graphical abstract