Dielectric properties of nano crystalline LnTiNbO6 (Ln = Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb) ceramics

Nano ceramics are potential candidates for various technological applications. Nano sized LnTiNbO(6) ceramics are prepared using solution combustion technique. The properties of the nano ceramics are compared with that of micro ceramics. XRD shows that nano crystalline LnTiNbO(6) (Ln= Ce, Pr, Nd, Sm) have aeschynite orthorhombic structure and Ln= Gd, Dy, Er, Yb have euxenite orthorhombic structure. The structure is confirmed by FTIR. From the TEM study, it is clear that polycrystalline powder is nano sized. The sintering temperature and sintering time of nano ceramics get lowered as compared to micro ceramics. The SEM image shows the surface morphology of the sintered sample. The variations of dielectric constant (epsilon(r)), conductance (G) and loss factor (tan delta) of the samples are studied in the radio frequency range. The nano ceramics show enhanced dielectric properties than that of micro ceramics.