Processing and Properties of Eu3+:LiTaO3 TransparentGlass–Ceramic Nanocomposites |
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Authors: | Anal Tarafder Kalyandurg Annapurna Reenamoni Saikia Chaliha Vidya Sagar Tiwari Pradeep Kumar Gupta Basudeb Karmakar |
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Affiliation: | Glass Technology Laboratory, Glass Division, Central Glass and Ceramic Research Institute (CSIR), Kolkata 700032, India; Laser Materials Development and Devices Division, Raja Ramanna Center for Advanced Technology, Indore 452 013, India |
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Abstract: | We report here the processing and properties of transparent glass and glass–ceramic nanocomposites in the Li2O–Ta2O5–SiO2–Al2O3 system in the presence of Eu2O3 as luminescent probe. The formation of the LiTaO3 crystal phase, the crystallite size, and the morphology with the progression of heat treatment have been examined by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transformed infrared reflectance spectroscopy measurements. The crystallite sizes obtained from XRD and TEM are found to increase with heat-treatment time and vary in the range of 2–20 nm. The measured photoluminescence spectra exhibit emission transitions of 5D0,1→7F j ( j =0, 1, 2, 3, and 4) of Eu3+ ions. From the nature of the emission transitions, the site symmetry in the vicinity of Eu3+ ions has been found to be near C3v in the glass–ceramic nanocomposites. An inverse correlation has been observed between the asymmetric ratio ( I ED/ I MD) of Eu3+ ions and the dielectric constant (?r), with an increase in the heat-treatment time of glass, which is caused by the dipole–dipole interaction. |
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