Abstract
Abstract Infrared reflectivity measurements are performed with a scanning interferometer on single crystals of Fe-doped barium titanate and Ba09 Sr01TiO3 solid solution, over a wide range of temperature in the paraelectric phase. Comparisons with results obtained on undoped BaTiO3 show that a substitution of 10% Sr in the barium site shifts up the soft mode frequency whereas substitution of 0.4% Fe in the Ti site does not significantly alter the soft mode behavior. The role played by impurities on the mechanism which drives the FE-PE transition is then discussed. (31 ref).
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