Transparent Magnetic Glass‐Ceramics

Abstract

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 21 formation, while the porous matrix ensured nano-sized crystallites to limit scattering losses. MnFe 2 O 4 glassceramics treated at 10001C offered the best combination of magnetic and optical properties with a saturation magnetization of 5.6 emu/g, a Verdet constant of 16.51/cm, and losses below 3 dB/mm at 1550 nm.

Preparation and optical nonlinearities of transparent bismuth-based glass ceramics embedded with Bi2O3 microcrystals

“…In recent years, transparent glass ceramics [1] are intensively studied since these materials with uniformly dispersed microncrystals (MC) possess advantages over conventional glasses such as better thermal and mechanical stabilities which offer promise for many potential applications [2,3]. Particularly in the field of nonlinear optics [4,5], they have been widely accepted for their large third-order optical nonlinearities (TONL) induced by dielectric confinement and quantum mechanical confinement effects.…”

Transition Elements and Nucleation in Glasses Using X‐ray Absorption Spectroscopy

“…The second role of TM is to confer new properties to the GC. Fe has been considered for magnetic properties that could be used for optical isolators, data storage, switching 8 , or biomedical applications. 9 Transition metals can also be used as effective atom heaters with a small amount (~1 mol% NiO or CuO), inducting laser-induced crystallization in glasses.…”

Photoluminescence properties of Er3+ and Er3+/Yb3+ doped tellurite glass and glass-ceramics containing Bi2Te4O11 crystals

“…Visible transparent glass-ceramics can be obtained by reducing the size of the crystallites formed in the glass matrix lower than the incident light wavelength or obtaining crystals with similar refractive indices as the glass host; otherwise, the crystals may scatter the incident light and reduce the material transmittance. 25,26 For tellurites, only a few works have reported visible transparent glass-ceramics with improved optical properties since they often present surface-nucleated instead of volumetric crystallization. 27–29 Recently, Kang and coauthors presented the improvement of Er 3+ -doped germanotellurite luminescence at 2.7 μm when glass-ceramic is formed.…”