Dielectric properties of novel composites prepared with few layered graphene (FLG)-lithium triniobate (LiNb < inf > 3 < /inf > O < inf > 8 < /inf > )

Abstract

Lithium triniobate (LiNb3O8) has been prepared using microwave assisted combustion synthesis at a low temperature of 400°C. Graphite oxide is synthesized using Hummers method and thereafter it is thermally exfoliated at 500 and 700°C to obtain two samples of Few Layered Graphene (FLG). Then, FLG-LiNb3O8 composites prepared through a simple ultra-sonication assisted solution mixing process. The obtained samples are named as FLN5 and FLN7 based on the temperature used to obtain FLG. Low frequency dielectric measurements are recorded for both the samples and the measured dielectric constant is observed to be more for FLN5 (250 at 60 Hz) than FLN7 (115 at 60 Hz) whilst the dielectric loss is less in case of FLN5 (1.525 at 60 Hz). The enhancement in dielectric properties for FLN5 is explained in terms of polarization in FLG-LiNb3O8 composites.