Giant Magnetodielectric Effect and Magnetic Properties of Ho_(0.5)Pr_(0.5)FeO_3 Ceramics

Polycrystalline sample Ho0.5Pr0.5FeO3 was prepared by a solid state reaction method. The magnetic properties and magnetodielectric effect of the sample were investigated. The results show that the Ho3+ antiferromagnetoly orders at T=4.5 K and the Fe3+ spin reorientation transition occurs at 59-80 K. The sample exhibits a colossal dielectric constant value of ~103 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 1.6×106 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.