Optical and Dielectric Properties of BiMn_(1-x)AE_xO_3 (AE= Cr, Fe, Co, and Zn; x=0, 0.1) Nanoparticles Synthesized by Sol-Gel Technique

摘要

BiMnO_3 is a multiferroic material which means that it shows both the ferroelectricity and ferromagnetism. Present study deals about the study of optical and dielectric properties of BiMnO_3 and doped BiMnO_3. The magnetic and non magnetic ions are introduced as dopants in place of Mn sublattice, BiMn_(1-x)AE_xO_3 (where x=0.1 and AE= Cr, Fe, Co, and Zn). We have synthesized nanoparticles of BiMnO_3 and BiMn_(1-x)AE_xO_3 (where x=0.1 and AE= Cr, Fe, Co, and Zn) by sol-gel technique. Optical properties have been studied by using FTIR (Fourier Transform Infrared) spectroscopy. FTIR (Fourier Transform Infrared Spectroscopy) analysis showed that there is an increase in the band gap of BiMn_(1-x)AE_xO_3 (where x=0.1 and AE= Cr, Fe, Co, and Zn) than pure BiMnO_3 for the samples synthesized by sol-gel technique. The increase in band gap on doping is due to the radius to charge ratio. Ferroelectric hysteresis loop confirms the presence of ferroelectricity in BiMnO_3. From the ferroelectric hysteresis loop the parameters like coericivity, saturation polarization and remanant polarization has been calculated. Nanoparticles of BiMnO_3 have applications in memory storage devices.