Chalcogenide Glasses

“…glassy materials containing one or more of the chalcogen elements S, Se or Te (sulphide, selenide and telluride glasses). [3] Next to specifications with respect to IR transmission, the candidate glasses must satisfy technological requirements with regard to the viscosity behavior and chemical stability, enabling the manufacturing of single mode, core-cladding fibers.…”

Section: Materials For the Infrared Single Mode Fibermentioning

confidence: 99%

Development of broadband infrared single-mode fibers for the DARWIN mission

Cheng

Faber

Gielesen

et al. 2006

Advances in Stellar Interferometry

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A vital function of the space interferometer foreseen in the DARWIN mission is the so-called "nulling" operation. The challenge of nulling is making the null in the interferometric signal sufficiently deep to cancel the light from the bright star during the collection of light from its surrounding planets. The performance of the nulling is limited by the wavefront quality of the beams. The wavefront error can be reduced by filtering. One promising concept for nulling wavefront filtering is using a single mode fiber. For the wavefront filtering in the DARWIN mission, the fiber has to cover the operational wavelength range of 4-20 µm. Furthermore, a minimal insertion loss is required to ensure a minimum exposure time. This results in the separation of the complete wavelength range into several separate wavelength bands in the nulling system. Within an ESA project, a chalcogenide glass fiber based on the Te-As-Se (TAS) composition is selected to be used for the short wavelength band. TNO has designed and tested several TAS fibers that have been manufactured by the University of Rennes. Single mode operation is demonstrated. Furthermore, the effect of bending the fiber and light coupling are investigated. For the long wavelength band up to 20 µm, Tellurium based glass is proposed. Different samples of various composition based on Te glass are manufactured. Accurate temperature control to avoid crystallization is found to be essential for the manufacturing process. For the bulk material, a transmission window up to 20 µm is measured.

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“…The SbSe glasses are attractive candidates for applications such as data recording devices requiring low melting temperatures, low thermal conductance and high viscosity. 1,2 The application of chalcogenide glasses based on amorphous or amorphous-crystalline changes requires the knowledge of crystallization process and thermal stability. The crystallization studies focus on the determination of nucleation and crystal growth mechanism and kinetics [3][4][5] to be able to predict the crystallization behavior under various conditions.…”

Section: Introductionmentioning

confidence: 99%

General Approach to the Nucleation and Crystal Growth in Sb_0.5Se_99.5 Glass Explaining the Shape of DSC Curves

Honcová

Shánělová

Barták

et al. 2016

Crystal Growth & Design

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Crystallization of amorphous Sb 0.5 Se 99.5 glass in the form of bulk and powder with defined particle sizes (prepared in protective atmosphere of argon) was studied by DSC. Different forms of sample exhibit quite complex behaviour involving crystallization on the surface and in the volume of the sample and it is reflected in the shape of DSC curve. Standard kinetic analysis cannot describe experimental results with interpretation of crystal growth mechanism, although the deconvolution procedure was done using several kinetic models, because of the time-lag of crystallization in the volume. However, theoretical curves based on nucleation and crystal growth rates, calculated separately for the process on the surface and in the volume of the sample, well correspond to real data and explain distinctive change in the shape of DSC curves with particle sizes.

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Chalcogenide Glasses

Cited by 9 publications

References 290 publications

A Novel Approach to Develop Chalcogenide Glasses and Glass-Ceramics by Pulsed Current Electrical Sintering (PCES)

A Novel Approach to Develop Chalcogenide Glasses and Glass-Ceramics by Pulsed Current Electrical Sintering (PCES)

Development of broadband infrared single-mode fibers for the DARWIN mission

General Approach to the Nucleation and Crystal Growth in Sb_0.5Se_99.5 Glass Explaining the Shape of DSC Curves

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Chalcogenide Glasses

Cited by 9 publications

References 290 publications

A Novel Approach to Develop Chalcogenide Glasses and Glass-Ceramics by Pulsed Current Electrical Sintering (PCES)

A Novel Approach to Develop Chalcogenide Glasses and Glass-Ceramics by Pulsed Current Electrical Sintering (PCES)

Development of broadband infrared single-mode fibers for the DARWIN mission

General Approach to the Nucleation and Crystal Growth in Sb0.5Se99.5 Glass Explaining the Shape of DSC Curves

Contact Info

Product

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General Approach to the Nucleation and Crystal Growth in Sb_0.5Se_99.5 Glass Explaining the Shape of DSC Curves