Desenvolvimento de compósitos luminescentes a partir de mesocristais de BaZrO3 e Poliamida 6

Abstract

The barium zirconate BaZrO3 (BZO) is a ceramic oxide which belongs to the functional group of ABO3 perovskitas, this compound when doped hafinium (Hf) in solid solution through the hydrothermal method assisted by microwave (HAM) potentiates their luminescent properties that can occur at room temperature. The HAM method is based on the direct coupling of electromagnetic radiation with the molecules of water occurring in the region of the microwave 2, 45 GHz. With this method of synthesis allows to obtain the BZO at a temperature of about 140oC and 160 minutes time threshold, below the parameters reported by other synthetic routes. The choice of using Hf as a dopant, the reason for the degree of its chemical similarity with features that zirconium (Zr), as its oxidation state (4+). Another good reason for the choice is that the hafnium have intrinsic luminescent characteristics, which influences the luminescent properties of BZO. In general, luminescent materials have high density and high atomic weight, which facilitates the process of absorbing radiation to be emitted in the form of visible light. These characteristics are strongly dependent on the morphology and especially the electronic structure of BaZrO3. The barium zirconate in pure form or doped hafinium is the only perovskita having radioluminescent intense emission at room temperature, this property is directly related to the synthesis method employed in the process of obtaining these oxides. The interest in these materials is at the heart of modern technology and can therefore have a potential application in the field of optics, electronics and aerospace. The present work was to obtain samples of BaZr1−xHfxO3 phase doped Hf of (0 6 x 6 16% in mol) synthesized by the HAM. After the electronic and structural analysis of the powders, self-assembled composite was produced from a polyamide 6.6 (TechnylR