Gupta, Gaurav and Balaji, Sathravada and Biswas, Kaushik and Kalyandurg, Annapurna (2018) Mid-IR transparent TeO2-TiO2-La2O3 glass and its crystallization behavior for photonic applications. Journal of the American Ceramic Society, 101 (9). pp. 3900-3916. ISSN 0002-7820

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In this report, effect of enhanced rare earth (La2O3) concentration on substitution of TeO2 within ternary TeO2-TiO2-La2O3 (TTL) glass system has been studied with respect to its thermal, structural, mechanical, optical, and crystallization properties with an aim to achieve glass and glass-ceramics having rare-earth-rich crystalline phase for nonlinear optical and infrared photonic applications. DSC analysis (10 degrees C/min) demonstrates a progressive increase in glass-transition temperature (T-g) from 359 to 452 degrees C with the increase in La2O3 content. Continuous glass network modification with transformation of TeO4] to TeO3/TeO3+1] units is evidenced from Raman spectra which is corroborated with XPS studies. While mechanical properties demonstrate enhancement of cross-linking density in the network. These glasses exhibit optical transmission window extended from 0.4 to 6m with calculated zero dispersion wavelength ((ZDW)) varying from 2.41 to 2.28m depending upon La2O3 content. Crystallization kinetics of TTL10 (80TeO(2)-10TiO(2)-10La(2)O(3) in mol%) glass has been studied via established models. Activation energy (E-a) has been evaluated and dimensionality of crystal growth (m) suggests formation of surface crystals. Glass-ceramic with crystalline phase of La2Te6O15 has been realized in heat-treated TTL10 glass samples (at 450 degrees C). As predicted from DSC analysis, FESEM study unveils the formation of surface crystallized glass-ceramics.

Item Type: Article
Uncontrolled Keywords: crystallization kinetics; La2Te6O15 containing glass-ceramics; lanthanum tellurite; mid-infrared transparent glass; tellurite glass
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 31 Oct 2018 12:21
Last Modified: 31 Oct 2018 12:21

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