Abstract
AbstractIn the present research technology of compositionally graded barium strontium titanate Ba1-xSrxTiO3thin films deposited on stainless steel substrates by sol-gel spin coating followed with thermal annealing atT= 650°C is reported. Results of thermal behavior of the sol-gel derived powders with compositions used for fabrication of graded structure (i.e. with Sr mole fractionx= 0.5, 0.4 and 0.3) are described. X-ray diffraction studies of the phase composition and crystal structure of such complex thin film configuration are given. It was found that gel powders exhibited a large total weight loss of about Δm≈ 44-47%. Three stages of weight loss took place at temperature ranges: belowT≈ 300°C, at ΔT≈ 300-500°C and betweenT= 600°C andT= 800°C. Phase analysis has shown that the dominating phase is Ba0.67Sr0.33TiO3compound while the second phase is Ba0.7Sr0.3TiO3or Ba0.5Sr0.5TiO3for “up-graded” and “down-graded” structure, respectively.
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