Giant Magnetodielectric Effect and Magnetic Properties of Ho sub(0.5)Pr sub(0.5)FeO sub(3) Ceramics

Polycrystalline sample Ho sub(0.5)Pr sub(0.5)FeO sub(3) was prepared by a solid state reaction method. The magnetic properties and magnetodielectric effect of the sample were investigated. The results show that the Ho super(3+) antiferromagnetoly orders at T=4.5 K and the Fe super(3+) spin reorientation transition occurs at 59-80 K. The sample exhibits a colossal dielectric constant value of ~10 super(3) around 270 K, which is correlated with a resistance transition at 270 K. The decrease of the resistance and the dielectric loss lead to the increase of the dielectric constant. Most importantly, a magnetic field of 1.6x10 super(6) A/m can induce a giant magnetodielectric response of 5500% under f = 1 kHz at room temperature. The giant magnetodielectric effect might come from the magnetorisistance effect.