High temperature magnetic behavior of multiferroics Bi1–xCaxFeO3

We investigate the room temperature microstructure and high temperature magnetic properties of Ca2+-substituted Bi1–xCaxFeO3 (0 ≤ x ≤ 0.2) ceramics. The Bi1–xCaxFeO3 compound transforms from rhombohedral into tetragonal structure with the phase boundary lying around x = 0.1. Based on this, the magnetic modulation becomes significant and the strongest remnant magnetization Mr is obtained at x = 0.1 compound. An important observation is the...