Premium
Processing and Properties of Eu 3+ :LiTaO 3 TransparentGlass–Ceramic Nanocomposites
Author(s) -
Tarafder Anal,
Annapurna Kalyandurg,
Chaliha Reenamoni Saikia,
Tiwari Vidya Sagar,
Gupta Pradeep Kumar,
Karmakar Basudeb
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03151.x
Subject(s) - crystallite , materials science , nanocomposite , photoluminescence , analytical chemistry (journal) , luminescence , ceramic , dielectric , fourier transform infrared spectroscopy , ion , glass ceramic , transmission electron microscopy , mineralogy , nanotechnology , optics , composite material , chemistry , optoelectronics , physics , organic chemistry , chromatography , metallurgy
We report here the processing and properties of transparent glass and glass–ceramic nanocomposites in the Li 2 O–Ta 2 O 5 –SiO 2 –Al 2 O 3 system in the presence of Eu 2 O 3 as luminescent probe. The formation of the LiTaO 3 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 5 D 0,1 → 7 F j ( j =0, 1, 2, 3, and 4) of Eu 3+ ions. From the nature of the emission transitions, the site symmetry in the vicinity of Eu 3+ ions has been found to be near C 3v in the glass–ceramic nanocomposites. An inverse correlation has been observed between the asymmetric ratio ( I ED / I MD ) of Eu 3+ ions and the dielectric constant (ɛ r ), with an increase in the heat‐treatment time of glass, which is caused by the dipole–dipole interaction.