Multicomponent A-site ordered perovskite BiMn3(Fe0.25Ti0.75)4O12: High-pressure synthesis, crystal chemistry and magnetic behavior

• A new multicomponent A-site ordered perovskite is synthesized at 6 GPa and 1300 K.
• It is Bi3+Mn2+3(Fe3+0.25Ti4+0.75)4O12 in the BiFeO3 and MnTiO3 pseudobinary system.
• It is of cubic Im-3 and shows Mn2+ site-splitting related to the A-site ordering.
• Magnetizations and specific heats show spin-glass-like behaviors below 11 K.

A new multicomponent A-site ordered perovskite-type oxide has been successfully synthesized in the BiFeO3 and MnTiO3 pseudobinary system at high pressure and temperature, 6 GPa and 1300 K. It is found that the oxide is an A-site ordered and B-site disordered perovskite Bi3+Mn2+3(Fe3+0.25Ti4+0.75)4O12 in the space group of the cubic high symmetry Im-3 with a lattice parameter a=7.5937(3) Å. It should be noted that the Mn2+ ions in the A′-site show a site-splitting, while the Bi3+ ones are in a regular icosahedron position of the A-site. On the other hand, the Fe3+ and Ti4+ ones in the B-site are disordered in this perovskite structure. The temperature dependence of magnetizations and specific heats at low temperatures shows spin-glass-like behaviors below 11 K.