Dielectric and especially ferroelectric materials can be used in many applications such as dynamic random access memories and infrared sensors. The dielectric properties of such materials have to be improved. For this purpose several compositions in the BaO-B203-Ti02 system have been studied. The investigated composition was BaTiO3 with a different amount of B203 in the range 25-50 mol%. Depending on the B203 amount the melting temperatures of the investigated glasses were in the range 1 lOO-1250°C.The vitreous materials have been submitted to thermal treatment in order to obtain surface and bulk crystallization. The Differential Thermal Analyses (DTA) showed out the tendency of crystallization for these samples in the 600-800°C-temperature range. For structural analyses there have been used the Xray diffractometry, DTA analyses, electronic microscopy and atomic force microscopy on samples crystallized by controlled thermal treatments.
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