Home – Home – Jornals – Chemistry for Sustainable Development 2003 number 3

Development of functional electronics as an alternative to the circuit engineering is tightly connected with solution of a number of problems in the field of material science and technology. Semiconductor complex oxides, magnetic, sensor and radiation-generating materials, ferro-, piezo- and pyroelectrics acquire a great importance in the modern world, since they play the role of "clever" materials. Their necessity is increasing as the most advanced branches of science and technology, in particular electronics, computer engineering, medicine, laser and photochemical engineering, are developing. Among the methods of obtaining complex oxide materials, very promising are those of solutions to which the sol-gel method belongs. Mixing the initial components in a solution and their subsequent thermal treatment result in obtaining homogeneous materials and decreasing the temperature and temporal parameters of synthesis. This makes it possible to introduce chemically active and easily fusible components, e. g., lead and bismuth, into the complex oxide composition. An important role in the stabilization of the characteristics of functional materials is played by their purity factor. The absence of admixtures and the homogeneity of phase composition ensure the maximal characteristics and brusque transitions realized in the work of functional materials. In order to obtain homogeneous, pure and morphologically uniform functional oxide materials, the authors propose an extraction-pyrolytic technology.