INFLUENCE OF Mg-DOPING ON SYNTHESIS OF SOL-GEL DERIVED BST THIN FILMS

摘要

Solid solutions of Ba_(1-x)Sr_xTiO_3 (BST) type are very attractive for application in information technology, but also in microwaves for such electrically controlled devices as phase shifters, tunable filters, steerable antennas, varactors, etc. In the present study thin films of a BST solid solution with x = 0.4 (BST60/40) were prepared by the sol-gel-type chemical solution deposition method. The influence of y = 1, 3 and 5 mol.% MgO doping on synthesis of BST60/40 thin films was studied. Thermal analysis both differential and thermogravimetric were used to determine the thermochemical properties of dried BST60/40-MgO gel powders. A multilayer spin-coating approach was utilized for the Ba_(0.6)Sr_(0.4)TiO_3-MgO thin film deposition on stainless steel substrates. X-ray diffraction analysis, SEM and EDS were utilized for thin firm characterization in terms of its crystalline structure, microstructure and chemical composition. Raman spectroscopy investigation of MgO-doped Ba_(0.6)Sr_(0.4)TiO_3 thin films grown on stainless steel substrates were also performed within the wavenumber range k = 40-1070 cm~(-1).