Impact of Cerium Doping on Dielectric Properties of Palmierite [K2Pb(SO4)2]
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Cerium-doped K2Pb(SO4)2 was synthesized by a coprecipitation method. K2Pb(SO4)2 is a semitransparent colourless or white material that occurs as a rare fumarolic sublimate. Only the crystal structure of palmierite has been reported to date. The present work concentrates on its vibrational and physical properties, including optical, thermal, and dielectric studies. The crystalline nature and lattice distortion were confirmed by x-ray diffraction analysis. Fourier-transform infrared (FTIR) spectroscopy revealed the functional groups present in the material. Morphological and elemental composition analyses were carried out by scanning electron microscope/energy-dispersive spectroscopy (SEM/EDAX). Thermogravimetric–differential scanning calorimetry (TG-DSC) analysis was carried out for improved understanding of the thermal characteristics of undoped and Ce-doped K2Pb(SO4)2. The optical characteristics were analyzed by photoluminescence (PL) spectrophotometry. The presence of cerium ions was confirmed by the emission peak at 314 nm, which may be due to 5d–4f transitions of Ce3+ ions. The dielectric constant and loss were measured as functions of frequency. The results indicate that cerium doping has a significant influence on the dielectric properties of K2Pb(SO4)2.
KeywordsCe-doped K2Pb(SO4)2 synthesis powder XRD analysis thermal studies dielectric behavior
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Funding was provided by UGC-BSR Fellowship for Sciences (Grant No. F.25-1/2013-14(BSR)/7-14/2007 (BSR)/30.05.2014).
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