Trace Analysis of Dysprosium-doped BaTiO_3 by ICP-AES using Bomb Acid Digestion Method

摘要

The bomb acid digestion method was used in this study to improve the decomposition efficiency of pure BaTiO_3 and Dy-doped BaTiO_3. A trace analysis was carried out using inductively coupled plasma atomic emission spectrometry (ICP-AES). The decomposition rate of pure BaTiO_3 was obtained at 130 °C and above 2 h, and the change of the efficiency according to digestion temperature was identified by the structural stability of BaTiO_3 related to a phase transition at around T_c. With pure BaTiO_3, optimization of the temperature and conditions increased the analysis efficiency. The bomb acid digestion method was applied to the mixture and compound of Dy-doped BaTiO_3 in the same way as with pure BaTiO_3. The decomposition and recovery rate decreased for the Dy-doped BaTiO_3 compound. To clarify this phenomenon, the phase transition of pure and Dy-doped BaTiO_3 was characterized through X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was revealed that the decomposition efficiency was considerably associated with the Curie temperature of Dy-doped BaTiO_3.