• S S SHEMIM

Articles written in Bulletin of Materials Science

• Gallium-substituted lanthanide titanium niobate electroceramics with enhanced dielectric properties

This study reports the development of niobium-based electroceramics for electrical, optical and high permittivity applications. The conventional solid-state ceramic method was employed to synthesize the ceramics Ce$_{0.8}$Ga$_{0.2}$TiNbO$_6$, Pr$_{0.8}$Ga$_{0.2}$TiNbO$_6$, Nd$_{0.8}$Ga$_{0.2}$TiNbO$_6$ and Sm$_{0.8}$Ga$_{0.2}$TiNbO$_6$. Structural studies of the prepared ceramics were carried out by applying X-ray diffraction technique along with vibrational spectroscopic studies. The pattern of the grains on the surface of the samples developed during the sintering was analysed by scanning electron micrograph. Ultraviolet–visible absorption spectra were used to generate the optical band gap for the samples. In addition, the dielectric properties at radio and microwave frequencies were studied. Grain and grain boundary effects on the electrical properties of the ceramics were assessed by applying impedance spectroscopic analysis. The high Q-factor and high dielectric permittivity of samples make them potential candidates for the dielectric resonator applications in communication systems. The impedance spectroscopic analysis confirms that the prepared ceramics exhibit electrical properties like semiconductors at high temperatures. The presence of gallium atoms in lanthanide titanium niobate system resulted in the lowering of sintering temperature and in the betterment of optical and electrical properties of the ceramics.

• # Bulletin of Materials Science

Volume 46, 2023
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020