Controllable synthesis and improved dielectric, magnetic properties of Tb-doped SmCrO₃

The ceramic composites of Sm_1-xTb_xCrO₃ (x = 0, 0.05, 0.1, 0.2, 0.3) were synthesized by solid-state reaction method. The dielectric constants of all samples increase with increasing temperature and present plateaus in high-temperature range, exhibiting huge dielectric constants (∼10⁴). Meanwhile the loss tangents undulate with increasing temperature and show two loss peaks corresponding two relaxations. The Tb-doped samples show larger dielectric constants and lower dielectric loss tangents compared with the pristine SmCrO₃ sample. At room temperature (∼300 K), comparing with the pristine SmCrO₃, the dielectric constant of Sm_0.8Tb_0.2CrO₃ at 100 kHz increases to 765 %, while the dielectric loss at 1 kHz decreases to 21 %. When the temperature is below 197 K, the magnetic properties significantly increase with the increase of doping amount. Compared with the pristine sample, the maximum magnetization of Sm_0.70Tb_0.30CrO₃ increased by approximately 200 times to 0.76 emu/g at 5 K in the zero-field cooling and an external magnetic field of 100 Oe.