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Gallium-substituted lanthanide titanium niobate electroceramics with enhanced dielectric properties
Volume 45 Published: 9 March 2022 Article ID 0052
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Fulltext
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https://www.ias.ac.in/article/fulltext/boms/045/0052 -
Keywords
High permittivity ceramics ;vibrational spectroscopy ;dielectric properties ;optical band gap ;impedance spectroscopy. -
Abstract
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.
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Author Affiliations
- Department of Physics, St Gregorios College, Kottarakara, Kollam 691531, India
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Dates
- Published
- 9 March 2022
- Manuscript received
- 4 June 2021
- Accepted
- 16 November 2021
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Bulletin of Materials Science
Volume 46, 2023
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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