Síntese e determinação do módulo elástico de cerâmicas de 0,6BiFeO3-0,4PbTiO3 dopadas com La

Abstract

The Elastic Modulus is a key parameter for engineering and application of materials; and is associated with other mechanical properties, such as yield stress and rupture stress. The assessment of this parameter for the compound of bismuth ferrite and lead titanate becomes important since the application of piezoelectric devices work in the elastic regime. In this study, 3, 5 and 10% of La doped 0.6BiFeO3-0.4PbTiO3 ceramics were processed through high and low-energy ball milling, followed by sintering in air at 1015, 1065 and 1115 ° C for 1 h. Their Elastic Moduli were determined by the Impulse Excitation Technique. The Impulse Excitation Technique (IET) is a non-destructive technique for evaluation of the elastic and damping properties of materials. The results showed a maximum elastic modulus of 74 GPa to 3% doped with lanthanum and sintered at 1115 ° C. For the other samples, it was observed an increase of the Elastic Modulus with the temperature increasing, with a consequent decrease of this property with the increase of lanthanum content.