High-pressure synthesis of BiFeO$_{3}$-BiAlO$_{3}$ and BiFeO$_{3}$-MnTiO$_{3}$ solid solution

There have been so many investigations for high-pressure synthesis of perovskite-type oxides in the material science field. Multiferroic material is particularly attracted in the field of electronic device materials. BiFeO$_{3}$ (ferroelectric antiferromagnet) is known as the only Bi-contained perovskite which can be synthesized at ambient pressure. We investigated solid solution systems of BiFeO$_{3}$-BiAlO$_{3}$ and BiFeO$_{3}$-MnTiO$_{3}$ under high pressure and high temperature to synthesize a new multiferroic compound in the present study. Chemical reagents of simple oxides were mixed with a mortar as a starting material. The mixture was rapped with a gold foil, and it encased in a cubic pressure-medium with a graphite furnace. High pressure experiments were carried out using two DIA-type high pressure apparatuses installed in Nagoya University. X-ray powder diffraction patterns of all recovered specimens were collected using Cu-K$\alpha $ radiation and magnetic susceptibilities for some of the recovered specimens were measured using a vibrating sample magnetometer. In the system of BiFeO$_{3}$-BiAlO$_{3}$, the BiFeO$_{3}$-type solid solution was only obtained in the both Fe- and Al-rich composition. While in the system of BiFeO$_{3}$-MnTiO$_{3}$, no solid solutions were observed.