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Single phased mullite-type Bi 2 Fe 4  –   x  Mn  x  O 10  –   δ   mixed crystals (0.25 ≤  x  ≤ 3.125) and the end-member Bi 2 Fe 4 O 9 , synthesized from the oxides by reaction sintering up to 825°C, were studied at high-pressures in order to probe their high-pressure behavior and any possible structural phase transitions. In-situ synchrotron radiation-based powder X-ray diffraction was carried out in a diamond anvil cell, under quasi-hydrostatic conditions, up to a pressure of about 20 GPa at room temperature for each sample. A pressure-induced phase transition was found in all samples. The transition appeared spread over a pressure range and was not completed at the top investigated pressure. This is the first report of a pressure-induced phase transition in Bi 2 Fe 4  –   x  Mn  x  O 10  –   δ   mixed crystals.

New pressure induced phase transitions in mullite-type Bi 2 (Fe 4 – x Mn x )O 10 – δ complex oxides