Thermal, Structural, Morphological and Dielectric Studies of Sol Gel Derived Codoped SrTiO3-δ

Gadolinium and Thulium doped SrTiO3- i.e. Sr1-xGdxTi1-yTmyO3- for 0≤x≤0.30 and 0≤y≤0.05 have been successfully synthesized using sol gel technique in this work. XRD patterns of the obtained ceramics are found to be sharp and well defined having no impurity phases for all the compositions. The lattice parameter ‘a' decreases with amount of Gadolinium. Thermal Analysis, XRD, FESEM and EDX studies confirm the formation of Sr1- xGdxTi1-yTmyO3- (0≤x≤0.30, 0≤y≤0.05) ceramics with required cubic structure. FESEM/EDX analysis revealed that ceramics possess high density with marginal inter-granular porosity. The dielectric studies of the synthesized samples revealed that the synthesized samples possess high dielectric constants, high ac conductivity and low loss factors. The improvement in the dielectric properties of the synthesized samples has been observed with gadolinium and thulium doping.