%0 Journal Article
%T Thermistor formation using BaTiO3 powders synthesised by the Pechini method
%A Claudia P. Fern¨˘ndez Perdomo
%A Jorge E. Rodr¨Şguez P¨˘ez
%J -
%D 2010
%X Barium titanate (BaTiO3) is a compound of interest in the field of electroceramics which is widely used in the manufacture of capacitors, piezoelectric transducers and resistive devices having a positive temperature coefficient (PTCR) and in manu- facturing pyroelectric and optoelectronic devices. Most of these devices are obtained by consolidating high purity, suitable sized particle ceramic powders; structured synthesis methods are required to ensure such requirements. BaTiO3 powders were synthesised by a polymeric precursor method (Pechini) in this work. Very pure, small particle sized, raw material was obtained. These powders were characterised using thermo- gravimetric and differential thermal analysis (TGDT), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results indicated that samples treated at 650ˇăC presented cubic BaTiO3 as unique crystalline phase. If a sample were treated at 1,100ˇăC, the tetragonal phase having a c/a <1.007 relationship was the main crystalline phase. Samples treated at 1,100ˇăC showed ferroelectric paraelectric transi- tion at T ˇÖ 123ˇăC. BaTiO3 tetragonal ceramic powders were uniaxially pressed and then synthesised at 1,200ˇăC for 2 hours. These samples were electrically characterised. These samplesˇŻ curves of electrical resistance versus temperature (R- T) showed their PTCR thermistor behaviour. Current-voltage (IV) variation was also measured at different temperatures
%K BaTiO3
%K electrical characterisation
%K Pechini
%K synthe- sis
%K thermistor
%U https://revistas.unal.edu.co/index.php/ingeinv/article/view/15745