Analysis of giant dielectric permittivity and electrical properties for energy storage devices through impedance spectroscopy in CaCu3Ti4O12

Calcium copper titanate (CCTO) ceramic is prepared by conventional solid-state reaction (SSR) technique. Sintering of manufactured CCTO ceramic is completed at 1050 degrees C for 4 h. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) are used to know the crystallinity and microstructural properties of CCTO ceramic. The space group (Im3) of CCTO crystal structure is confirmed by XRD analysis. FE-SEM image discloses that the grains have distinguishable grain boundaries. Grains are highly compact and porosity is very low. The dielectric properties and electrical properties are investigated in the temperature and frequency range of (30-130 degrees C) and (100 Hz-1 MHz), respectively. At 100 Hz and 30 degrees C, CCTO exhibits a giant dielectric constant similar to 7685. Impedance analysis confirms the relaxation, depends on temperature in CCTO ceramic. Existence of relaxation named non-Debye in CCTO ceramic is confirmed by Modulus study. Activation energy calculated by linear fitting of dc-conductivity is 0.14 eV. This material is a suitable candidate for capacitor application due to giant dielectric constant.

Automated summary

The preparation and properties of CCTO ceramics prepared by SSR technique were studied, showing that the ceramics have a giant dielectric constant and low porosity, making them suitable for capacitor applications. The results were confirmed through XRD and FE-SEM analyses, as well as dielectric and electrical property investigations in various temperature and frequency ranges.