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Transparent Magnetic Glass‐Ceramics
Author(s) -
Dejneka Matthew J.,
Powell Christy,
Borrelli Nick,
Ouzounov Dimitre,
Gaeta Alex
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00072.x
Subject(s) - verdet constant , materials science , superparamagnetism , spinel , ceramic , crystallite , porous glass , ferrite (magnet) , faraday effect , porosity , composite material , magnetization , mineralogy , metallurgy , magnetic field , chemistry , physics , quantum mechanics
Transparent magnetic glass‐ceramics were produced by infiltrating nano‐porous glass with nitrate salts and firing. The resultant glass‐ceramics contained spinel ferrite nanocrystals that exhibited ferromagnetic and superparamagnetic behavior depending on composition and firing temperature. Transparency in the near infrared was obtained when oxidizing conditions were used to prevent Fe 2+ formation, while the porous matrix ensured nano‐sized crystallites to limit scattering losses. MnFe 2 O 4 glass‐ceramics treated at 1000°C offered the best combination of magnetic and optical properties with a saturation magnetization of 5.6 emu/g, a Verdet constant of 16.5°/cm, and losses below 3 dB/mm at 1550 nm.