The study of granulometric composition and porous structure of powders in the system of Sn(IV)-Sb-O and thick film gas sensors on their base

摘要

Influence of the presipitation conditions of the hydroxide mixture tin and antimony and heat treatment temperature on the allocation of particles on the size and porousity of powder solid solution in Sn(IV)-Sb-O is investigated. It has been shown, that hydroxide Sn and Sb powders have the microporous structure and high (>200 m{sup}2/g) specific surface. Creation of the solid solution Sn{sub}(1-x)Sb{sub}xO{sub}2 (x≤0, 1) occurs under heat treatment of powders at more than 870° and accompanies bythe aglomeration of particles and conversion of the microporous structure to the mesoporous one. It has been determined, that increase of Sb content in the solid solution results in the formation more ultrafine powders. Parameters of the porous structureof volumetric patterns of the semiconductor gas sensors, obtained by the heat treatment of the solid solutions and ultrafine clay has been investigated.