The effect of CuO additions on the firing temperature of the anatase phase of TiO2 has been investigated using X-ray diffraction, transmission electron microscopy, and dilatometry. It was found that the addition of 2 wt% CuO to TiO2 anatase significantly lowered the sintering temperature to approx. 900°C. The presence of a CuO-rich intergranular phase in the sample was observed and was attributed to the presence of a liquid phase during sintering. The addition of CuO to anatase phase TiO2 lowered the phase transformation temperature as well as the temperature of a shrinkage anomaly. This shrinkage anomaly is apparent in a temperature region showing a reversal of the shrinkage rate. The low-firing of CuO-doped anatase was attributed to the association of two distinct mechanisms: the formation of CuO-rich liquid phase at higher temperatures and a shrinkage onset present at lower temperatures associated with the phase transformation.
Bibliographical noteFunding Information:
This work was supported by Programs for Joint Technology Development Encouraging the Cooperative Linkage among Industries, Universities, and Government Research Institutes promoted by Ministry of Information and Technology.
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering