A ternary phase diagram of the Mn–Te–O system at 950 K

A ternary phase diagram of the Mn–Te–O system at 950 K has been established in the composition range in and around the MnO–TeO2 pseudo binary line. Various preparation methods were employed to confirm the co-existence of different ternary phases. The results of these phase equilibration studies were revalidated by the invariancy of partial pressures at constant temperature during high temperature mass spectrometric vaporization experiments. The following three-phase regions have been identified: MnO+Mn3O4+Mn6Te5O16 (phase region 1; PH1), Mn3O4+Mn6Te5O16+MnTeO3 (phase region 2; PH2), Mn3O4+MnTeO3+Mn3TeO6 (phase region 3; PH3), and MnTeO3+Mn2Te3O8+Mn3TeO6 (phase region 4; PH4). The complex nature of the Mn–Te–O ternary system was revealed by the interesting results obtained by us with regard to preparation of samples and mass spectrometric vaporization experiments.