07/30/2022: 5:30 PM - 7:30 PM
Portland Marriott Downtown Waterfront
Room: Exhibit Hall
Single-phase materials that are simultaneously ferroelectric and ferromagnetic at room temperature are promising for non-volatile random access memory devices. Perovskite BiFeO3 which crystallizes in the polar rhombohedral structure (R3c), is ferroelectric and antiferromagnetic at room temperature. Here, we report a family of perovskite oxides in the BiFeO3 – Bi2/3TiO3 – ATiO3 (where A2+ = Ca2+, Sr2+, Ba2+) ternary phase diagram that is polar as well as weak ferromagnetic. We achieved nearly pure A-site bismuth-based perovskite phase Bi0.9167R0.075Fe0.9Ti0.1O3 that crystallizes in the space group R3c similar to BiFeO3 as corroborated by powder X-ray and neutron diffraction analysis. Their polarity was confirmed by second harmonic generation (SHG) experiments. Room-temperature powder neutron diffraction confirms G-type antiferromagnetic ordering consistent with weak ferromagnetism that onsets at TN = 557 K. These perovskites show a low dielectric loss, and the electrical response is dominated by grain contributions below 723 K.