Influence of Ca additives on the optical and dielectric studies of sol-gel derived PbTiO3 ceramics |
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Authors: | Arun Singh K Sreenivas |
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Institution: | a Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India b Department of Physics, University of Puerto Rico, San Juan, PR 00931, USA |
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Abstract: | Sintered ceramic powders of calcium-doped lead titanate Pb1−xCaxTiO3] ceramics with different Ca dopant concentration in the range (x=0-0.35) have been prepared using a sol-gel chemical route. The sol-gel technique is known to offer better purity and homogeneity, and can yield stoichiometric powders with improved properties at relatively lower processing temperature in comparison to conventional solid-state reaction. X-ray diffraction (XRD) and Raman spectroscopy studies have been carried out to identify the crystallographic structure and phase formation. The infrared absorption spectra in the mid-IR region (400-4000 cm−1) show the band corresponding to the Ti-O bond at ∼576 cm−1 and is found to shift to a higher wave number 592 cm−1 with increasing Ca content. The dielectric properties as a function of frequency, and phase transition studies on sintered ceramic Pb0.65Ca0.35TiO3 has been investigated in detail over a wide temperature range 30-600 °C and the results are discussed. |
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Keywords: | A Ceramics C X-ray diffraction C Raman spectroscopy D Dielectric properties |
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