Showing papers by "Neetu Ahlawat published in 2017"
TL;DR: In this paper, the effect of Ca substitution on the electrical properties was studied by impedance spectroscopy in the temperature range 303 K 723 K. The dielectric properties of the synthesized ceramics were characterized by a strong temperature and frequency dependence.
36 citations
TL;DR: In this paper, the phase purity of the prepared composition has been confirmed by X-ray diffraction (XRD) pattern and various structural parameters are presented with Rietveld refinement data.
36 citations
TL;DR: The unique dielectric properties of CaCu3Ti4O12 (CCTO) are a promising feature for capacitor applications as discussed by the authors, and polycrystalline Ca 0.95Nd0.95Zr0.05O12 ceramic was synthesized via conventional so...
Abstract: The unique dielectric properties of CaCu3Ti4O12 (CCTO) are a promising feature for capacitor applications. Polycrystalline Ca0.95Nd0.05Cu3Ti3.95Zr0.05O12 ceramic was synthesized via conventional so...
14 citations
TL;DR: In this article, the results of microstructure, dielectric and ferroelectric investigation of microwave sintered CaCu3Ti4O12 (CCTO) ceramic with different heating rate are presented.
Abstract: In the present work, the results of microstructure, dielectric and ferroelectric investigation of microwave sintered CaCu3Ti4O12 (CCTO) ceramic with different heating rate are presented. Scanning electron micrographs revealed that grain size decreases from 1.167 μm to 0.744 μm with increased heating rate from 10oC/min. to 50oC/min which can be explained on the basis of phenomenological kinetic equation for grain growth. Dielectric response also found to influence by heating rate. The CCTO ceramic sintered with 50oC/min. exhibited highest dielectric constant (ɛr~3915) with nominal losses (0.10) at room temperature in broad frequency range from 10Hz-10Hz. Cole-Cole plots revealed the change in grain boundary resistivity mainly caused by the oxygen vacancy activities and affected by varying sintering heating rate. An anomaly observed for 50oC/min heating rate due to trapping of oxygen at grain boundaries. The remnant polarization and coercive field for CCTO ceramic sintered with 50oC/min were 0.1 μC /cm and 1.477 kV /cm respectively. Remnant polarization found to decrease while the coercive field increases with increasing heating rate applying these are micro-structural dependent. Copyright © 2017 VBRI Press.
3 citations