Reference | Presenter | Authors (Institution) | Abstract |
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08-066 | Ricardo Augusto Mascarello Gotardo | Gotardo, R.A.(Tecnological Federal University of Paraná); Alonso, R.S.(Tecnological Federal University of Paraná); Rosso, J.M.(Universidade Estadual de Maringá); Santos, G.M.(Maringá State University); Silva, D.M.(Maringá State University); Cótica, L.F.(Maringa State University); Santos, I.A.(Maringa State University); Reis da Silva, E.F.(Universidade Tecnológica Federal do Paraná); | Among the multiferroic materials, bismuth ferrite (BFO) and BFO - based materials are perhaps the most promising and most studied systems. Manly due to the fact that their ferroelectric and antiferromagnetic phase transitions are found significantly above room temperature, i.e., BFO presents ferroelectric characteristics below Tc ~1100 K, and antiferromagnetic characteristics below TN ~650 K. The drawbacks of these materials for bulk practical applications are the low resistivity and the difficult to synthetize single-phase polycrystalline materials. The solid solution (x)BiFeO3 – (1-x)BaTiO3 (BFO-BT) is reported to increases the electrical DC resistivity and improve the piezoelectric properties. In fact, some reports are pointing to high temperature lead free piezoelectric materials. Although, the increase in resistivity for solid solutions with high concentrations of BFO, x = 0.9 and 0.8, are not enough for practical applications. Also, magnetization values are very low and some materials still present the incommensurate cycloidal spin structure that cancels the net macroscopic magnetization. To overcome the low DC electral resistivity, one solution is doping the materials with multiple valence ions. In this work, structural, magnetic and electral studies were conducted in 0.9BiFeO3–0.1BaTiO3 ceramics doped with Mn and Cr processed by high-energy ball milling. Our results point to the formation of single phase materials with perovskite structure. The addition of MnO2 and Cr2O3 improves the magnetization, resistivity, dielectric properties and polarization values of the samples. |
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