Transparent non-stoichiometric Tb2.45Hf2O7.68 magneto-optical ceramics with high Verdet constant. (November 2021)

• Record Type: Journal Article
• Authors: Zhang, Lixuan; Li, Xiaoying; Hu, Dianjun; Xie, Tengfei; Wu, Lexiang; Yang, Zhaoxiang; Li, Jiang
• Is Part Of: Scripta materialia. Number 204(2021)
• Publication Date: 2021-11
• Subjects: Tb2.45Hf2O7.68 -- Magneto-optical ceramics -- Non-stoichiometry -- Verdet constant; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114158
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Transparent Tb2.45 Hf2 O7.68 ceramics were fabricated successfully by reactive sintering at 1700 °C for 3 h with hot isostatic pressing (HIP) post-treatment at 1700 °C for 3 h. In-line transmittance of the Tb2.45 Hf2 O7.68 ceramic specimen with the thickness of 2.0 mm reached 79.4% at 1064 nm. X-ray diffraction was used to verify the existence of pyrochlore phase and the occupation sites of Tb 3+ were discussed. Elemental mapping showed no secondary phase in Tb2.45 Hf2 O7.68 ceramics. Verdet constant of the Tb2.45 Hf2 O7.68 ceramics at 633 nm is -165.6 radT −1 m −1, which is 23.6% higher than that of commercial Tb3 Ga5 O12 crystal (-134 radT −1 m −1 ) and 8.4% higher than that of Tb2 Hf2 O7 (-152.8 radT −1 m −1 ). Tb2.45 Hf2 O7.68 ceramics with high Verdet constant are promising to be used in compact Faraday rotators. Graphical abstract: Image, graphical abstract