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Synthesis of Eu 3+ ‐doped BaBi 2 Ta 2 O 9 based glass‐ceramic nanocomposites: Optical and dielectric properties
Author(s) -
Chakrabarti Anirban,
Tarafder Anal,
Molla Atiar Rahaman
Publication year - 2018
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/jace.15217
Subject(s) - materials science , dielectric , analytical chemistry (journal) , crystallization , doping , dielectric loss , crystal (programming language) , fourier transform infrared spectroscopy , ceramic , band gap , dissipation factor , mineralogy , composite material , optics , chemical engineering , chemistry , optoelectronics , chromatography , computer science , engineering , programming language , physics
In this paper we report for the first time synthesis of Eu 3+ ‐doped transparent glass‐ceramics ( TGC ) with BaBi 2 Ta 2 O 9 ( BBT ) as the major crystal phase using the glass system SiO 2 –K 2 O–BaO–Bi 2 O 3 –Ta 2 O 5 by melt quenching technique followed by controlled crystallization through ceramming heat treatment. DSC studies were conducted in order to determine a novel heat‐treatment protocol to attain transparent GC s by controlling crystal growth. The structural properties of the BBT GC s have been investigated using XRD , FE ‐ SEM , TEM and FTIR reflectance spectroscopy. Optical band gap energies of the glass‐ceramic samples were found to decrease with respect to the precursor glass. An increased intensity of emission along with increase in the average lifetime of Eu 3+ was observed due to incorporation of Eu 3+ ions into the low‐phonon energy BBT crystal site. The local field asymmetric ratios of all the samples were observed greater than unity. The dielectric constant (ε r ), dielectric loss, and dissipation factor values of both the base glass and ceramized samples were found to decrease with increase in frequency.