Characterization of oxygen defect and zinc segregation in the dense tin dioxide ceramics added with zinc oxide

抄録

We investigated the effect of zinc oxide addition for the defects in the dense SnO₂ ceramics. Cathode and photoluminescence properties revealed the luminescence originated to oxygen vacancies in SnO₂ grains and the presence of non-radiative defect at the grain boundaries. The oxygen diffusion profile showed that the oxygen diffusion was controlled by the limited process at the surface and uniform concentration of ¹⁸O at the grain boundaries inner side of sample. This sample exhibited a low Zn concentration in grains and a high Zn concentration at grain boundaries. We conclude that segregation of Zn at grain boundaries prevents SnO₂ from decomposing at high temperatures, enabling dense SnO₂ ceramics to be obtained.