Title
Synthesis and characterization of AZrTi2O7 (A = mg, ca, Sr and Ba) functional nanoceramics
Author
Sandeep K, Jijimon K. Thomas, Sam Solomon
Year
2019
Journal
Journal of Electroceramics
Abstract
Nanocrystalline AZrTi2O7 (A = Mg, Ca, Sr and Ba) system has been synthesized by an auto-ignited combustion technique. The structure of the system is analyzed by powder X-ray diffraction and vibrational spectroscopic tools. The cation deficient zirconolite (CaZrTi2O7) is found to be a monoclinic structure with the space group C2/c. A narrow size distribution of the nanoparticles is observed by transmission electron microscopy with a peak at 11 nm. The optical band gap of the ceramics obtained by using Tauc’s plot is in between 3.10 eV and 3.30 eV. The photoluminescence emission spectra of the samples are investigated and the probable transitions producing the emissions are identified. The microstructure of the sintered pellets are examined by scanning electron microscopy and the elemental compositions are confirmed by energy-dispersive spectrometry. Impedance spectroscopic analysis of the sample showed that ions are the main source of conduction. Ionic conduction and grain boundary conduction stimulate high conductivity to the material. Electrical property measurements in the temperature range 500–850 °C indicate that CaZrTi2O7 is stable and can be utilized over a wide range of temperatures and frequencies. These materials are found suitable for optical and solid oxide fuel cell applications.
Instrument
FP-8500
Keywords
Fluorescence, Photoluminescence, Nanostructures, Materials