Assessment of the critical behavior in the multiferroic Bi0.8Ba0.1Er0.1Fe0.96Cr0.02Co0.02O3 material, multi-substitution effect on magnetic and Mossbauer properties

The magnetic properties, Mossbauer and the critical behavior of the compound Bi0.8Ba0.1Er0.1Fe0.96Cr0.02Co0.02O3 prepared by sol-gel are the subject of this study. The compound has an R3c structure and exhibits a ferromagnetic to paramagnetic phase transition c.a. 574 K. A theoretical adjustment of the hysteresis cycles at room temperature show two magnetic contributions: Ferromagnetic (FM) and Antiferromagnetic (AFM) with a predominance of the first contribution. Mossbauer spectroscopy revealed two Fe3+ cations differently coordinated. Magnetic measurements versus magnetic field reveal that the sample exhibits a second order magnetic phase transition. The Curie temperature and the critical exponents (beta, gamma and delta) were determined by different techniques. These values are in agreement with the ones predicted by the mean field model.