Gajanan Prabhudessai, Akila (2021) Synthesis and Investigation of Multicomponent Chalcogenide Glasses for Mid/Far Infrared Transmission and Electrical Properties. PhD thesis, CSIR CGCRI and Jadavpur University.
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Oxide glasses have always been playing an important role due to their excellent thermal, mechanical and optical properties. These glasses possessing such excellent qualities lacks the extended transmission in infrared (IR) region beyond 5-6 µm which gave rise to important class of non-oxide glass referred as chalcogenide glass. As the name suggests, chalcogenide glasses are composed of chalcogens such as sulphur, selenium or tellurium as one of the important network former and synthesised stringently in the absence of oxygen. The glasses containing either of these chalcogens or/and in combination with other elements form a most interesting and widely studied chalcogenide glass family with many attractive properties in the field of mid/far infrared photonics in the last century. Their homopolar and heteropolar bond formation, low phonon energy, high refractive index,excellent transparency in infrared and their easy moulding nature due to less Tg made them the suitable candidates for many applications such as thermal imaging, phase change memory devices, infrared optics etc. Low optical losses and wide transparency range are the main properties that are achievable in chalcogenide glasses due to absence of oxygen (O2). There are different sulphur based chalcogenide glasses that have good thermal and mechanical properties but their optical transmission is limited to 10 m only. Addition of halides such as iodine (I) helps in shifting their mid-infrared cut-off beyond 11µm and halide containing sulphide glasses can be potential candidates for thermal imaging or night vision applications due to their good thermal and mechanical properties. Space exploration to search for chemical signature of life in different planets has drawn the attention towards the development of materials capable of sensing atmospheric carbon dioxide (CO2) and it led to the development of selenium containing tellurium rich chalcogenide glasses. Telluride glasses possess large transmission window along with unique property of good electrical conductivity and favourable thermal properties. These properties make them good optical component and as well as an electrode. There are many biomolecules which are present in our body have their fingerprint around 13-16 µm wavelength range, and these glasses being transparent well beyond 16 µm will be the best and suitable candidate for far-infrared or biomedical applications. The addition of tetrahedral germanium or trivalent arsenic or antimony to tellurium rich glasses enhances thermal and mechanical properties which are suitable systems for far-infrared applications. In present work, the aim is to achieve a glasses with mid-infrared transmission cut off beyond 11 µm by adding iodine in sulphide glass systems. For far-infrared applications, approach to synthesise glasses with well extended cut-off beyond 16 µm by diminishing impurities has been successfully fulfilled by achieving appropriate thermal and mechanical properties. Electrical properties were also explored by adding silver iodide (AgI) in both sulphide and selenide-telluride based chalcogenide glass systems.
| Item Type: | Thesis (PhD) |
|---|---|
| Additional Information: | Supervisor: Dr. K. Annapurna |
| Subjects: | Glass |
| Divisions: | Glass |
| Depositing User: | Ms Upasana Sahu |
| Date Deposited: | 28 May 2024 07:21 |
| Last Modified: | 28 May 2024 07:21 |
| URI: | http://cgcri.csircentral.net/id/eprint/5720 |
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