Structural, morphological and dielectric traits of Zr$_{1−x}$Ca$_x$TiO$_4$ ($x = 0$, 0.05, 0.10, 0.15 and 0.2) ceramics

[摘要] The influence of Ca doping on structural, morphological and dielectric characteristics of Zr$_{1−x}$Ca$_x$ TiO$_4$ ($x = 0$, 0.05, 0.10, 0.15 and 0.2) ceramics has been planned in this effort. Un-doped and Ca-doped ZrTiO$_4$ (ZT) have been synthesized through a sol–gel auto-combustion approach. The orthorhombic phase of ZT and Ca-doped ZT is confirmed through X-ray diffraction patterns. The variation in structural morphology and particle size due to Ca incorporation in ZT has further been revealed by field emission scanning electron microscopy. The investigation showed that the size of the particlegradually reduced from 0.5 to 0.125 $\mu$m with the increase of Ca content. It was confirmed from Fourier transform infrared spectroscopy that organic content was not found in the prepared samples. Dielectric constant, dielectric loss factorand tangent loss reduce with the increase in frequency and increase in Ca content. These dielectric parameters show independency at a higher frequency. The modulus plots confirmed that the capacitive parts were relatively independent of the frequency, whereas ac conductivity exhibited frequency dependent behaviour i.e., an increase with Ca concentrationand with increasing frequency. The impedance plots revealed the resistance dominance due to the grain boundary effect.

[学科分类] 材料工程

[关键词] XRD;dielectric properties;EDS;FE-SEM;FTIR;sol–gel synthesis.