PREPARING MICROCOMPOSITE POWDERS DOPED WITH ANTIMONY DIOXIDE AND PROPERTIES OF THICK FILMS BASED ON THOSE POWDERS

摘要

The goal of the work reported here was to develop a method of applying glass nanolayers of variable thickness to Sn_(0.9)Sb_(0.1)O_2 particles and to investigate how this affects the electrical properties of thick-film resistors. We prepared Sn_(0.9)Sb_(0.1)O_2 powders by calcinating coprecipitated tin and antimony hydroxides. Thin layers of aluminum, barium, and boron compounds were then precipitated from aqueous solutions onto powder particles. Nanolayers of glass in the BaO - Al_2O_3 - B_2O_3 system were obtained by dissolution followed by heat treatment. Resistive thick films made from such microcomposite powders have a higher resistivity than do those prepared by traditional methods and that resistivity changes little after repeated heat treatments. The thermal coefficient of electrical resistance decreases with increasing thickness of the glassy layer on the surface of the conducting particles.