“…In Bi-Co-O system also a perovskite type structure BiCoO 3 was synthesized at extremely high pressures by hot pressing in the Belt-type apparatus [8]. Detailed studies of the Bi-Co-O system are important due to the assessment of high temperature phase equilibria in Bi-Sr-Co-O system involving thermoelectric mixed oxides [9][10][11][12][13][14][15][16]. Thermoelectric mixed oxides, from which the most promising candidates are the misfit cobaltites and perovskite manganites [17,18], can be used to reduce waste heat in industry.…”