Determination of X-ray absorption coefficient coefficient of hydrothermally synthesized barium titanate at different temperatures and varying reaction times

In this work, the absorption coefficient of hydrothermally synthesized BaTiO3 (barium titanate) was calculated. BaTiO3 was prepared via the peroxo-hydroxide method and hydrothermally synthesized at 80, 100, 150, and 200°C and reacted for varying reaction times between 150 min up to 120 h. Absorption coefficient measurements were done with a coaxial HPGe gama detector (Ortec, GEM55P4-95) with a working range in the X-ray energy region. The samples were made into pellets of 10 mm and were exposed to 241Am radioisotopes at energy of 59.54 keV for 300 second. FT-Raman and XRD revealed that increasing the hydrothermal temperature and the reaction time promoted the formation of phase pure BaTiO3 with a mainly tetragonal crystal structure. At the early stages of the hydrothermal reaction secondary barium titanate phases (BaTi2O5 and Ba2TiO4) were also observed which affected the absorption coefficient values. It was observed that the formation of these secondary barium titanate phases was in conjuction with the calculated attenuation coefficient values.