The Effect of Ionic Radius Carbon Dot on Ti4+ in Lattice Parameters of Ba0.2Sr0.8TiO3 Thin Films

Abstract

Barium Strontium Titanate (Ba_0.2Sr_0.8TiO₃) film which was captured by carbon dot with variation container 0%, 2%, 4%, 6% using CSD method with the help of spin coating with a rotating speed of 8000 rpm has been successfully made on p-type (100) silicon substrate. The film was annealed at 850 °C and held for 8 hours. Ba_0.2Sr_0.8TiO₃ film at a concentration 0%, 2%, 4%, 6% carbon dot characterized by XRD. The result of XRD characterization showed that the BST lattice structure is a cube with lattice parameters a=b=c in sequence of 3.306 Å; 3.324 Å; 3.336 Å and 3.287 Å. Based on the results of the analysis of the lattice parameters of Ba_0.2Sr_0.8TiO₃ doped with carbon dots, it shows that the lattice parameters increase, this is because the carbon dots have an ionic radius 10 Å larger than the ionic radius of Ti⁴⁺ (0.61 Å).