| Dielectric and AC Conductivity Analysis of LS-2 Ceramics
for Thermally Stable Applications |
Abhijit Prasad,* Anand Kumar Tripathi and Geetika Pandey
Pages : 218-223
DOI:10.1080/0371750X.2026.2682183 |
| Abstract |
| This work presents a focused investigation of the dielectric and electrical
conduction properties of LS-2 ceramics, synthesized from Li2CO3
and SiO2
in a 1:2
molar ratio. Building on earlier comparative studies, the present study examines
LS-2 in isolation to highlight its potential as a thermally stable, low-loss dielectric
material. Dielectric constant, loss tangent, and AC conductivity were measured
over a wide temperature (35o
-400oC) and frequency (100 Hz-5 MHz) range. The
dielectric constant exhibits a thermally stable response, while dielectric loss
decreases with frequency, indicating reduced energy dissipation suitable for high-
frequency applications. AC conductivity follows Jonscher’s power law and exhibits
thermally activated behaviour with a negative temperature coefficient of resistance.
Arrhenius analysis reveals two conduction regimes with activation energies
of 0.048-0.058 eV (low temperature) and 0.13-0.36 eV (high temperature), indicating
hopping conduction mediated by mobile Li+
ions and oxygen vacancies. Field
emission scanning electron microscopic analysis reveals a relatively dense and
heterogeneous microstructure, consistent with the multiphase nature confirmed
by X-ray diffraction, which contributes to interfacial polarization effects.
These results demonstrate that LS-2 ceramics exhibits stable dielectric
behaviour and is a promising candidate for high-frequency dielectric applications.
The study also provides a basis for further optimization through microstructural
control and dopant incorporation. |
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