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The equilibrium formation conditions of the HgBa 2 CaCu 2 O 6+δ phase were investigated by experiments based on reaction of HgO, BaO, CaO and CuO in sealed silica tubes. While the oxygen partial pressure during the synthesis was controlled by suitable redox couples, like CoO/Co 3 O 4 or Mn 3 O 4 /Mn 2 O 3 , the equilibrium...
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