We studied the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ at varying laser irradiation power. Each compound has two Raman bands around 570 and 590 cm-1 which are assigned to the vibrations of the interstitial oxygen in HgOδ layers and the apical oxygen in BaO layers, respectively. The 590 cm-1 band shifts position slightly with irradiation, and both the intensity and position of the 570 cm-1 band vary significantly with the laser power. The occupation factor of the interstitial oxygen is sensitive to the annealing temperature. At higher temperatures (550-600°C), both compounds decompose into various (Ba,Cu)-oxides such as Ba1-xCaxCuO2.
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