Effect of CuO on the Sintering Behavior and Dielectric Characteristics of Titanium Dioxide

Abstract

The sintering behavior and dielectric characteristics of a titanium dioxide (TiO2) were investigated by adding CuO. The addition of CuO lowered the sintering temperature of the TiO2. At a given temperature, the densification and grain growth rate for a TiO2 with CuO were enhanced, compared with those of pure TiO2. The results suggest that CuO acts as an activator for the sintering of TiO2. Dielectric constant and loss were also examined for both pure and CuO added TiO2 samples. The variations of dielectric constant and loss were discussed in terms of grain size, porosity, and oxygen deficiency.

Evolution of the intergranular phase during sintering of CaCu3Ti4O12 ceramics

“…30 Moreover, recent measures of the dielectric constant of TiO 2 doped with small amounts of CuO show values on the order of 90. 31,32 This indicates that the increase of ε b would correspond to a nearly complete conversion of the intergranular composition from Cu-oxide rich phase (observed to be the main component on samples sintered for 2 h) to Ti oxide rich phase. This conversion of the interphase composition agrees with the observed incorporation of Cu cations from the intergranular phase into the CCTO grains.…”

Sintering and the mechanical properties of the tricalcium phosphate–titania composites

“…Moreover, titania is an attractive material, applicable to various fields, such as biomedical applications (Jung and Kim, 2010;Kaneko et al, 2002;Li et al, 2007;Mazehri et al, 2009;Shin and Paek, 2006). Furthermore, the titania is considered as having excellent biocompatibility, manifested in various biomedical applications (Jung and Kim, 2010;Kaneko et al, 2002;Li et al, 2007;Mazehri et al, 2009;Shin and Paek, 2006). In the light of this consideration, we have chosen titania as the agent to be added to the tricalcium phosphate.…”

“…Besides, titania has attracted much attention due to its excellent ability to chemically bond with living hard tissue (Jung and Kim, 2010;Kaneko et al, 2002). This happens through the formation of a bone mineral-like tricalcium phosphate phase on the material surface that ultimately induces direct bonding with native bone tissue (Li et al, 2007;Mazehri et al, 2009;Shin and Paek, 2006). Thus, titania has been attracting attention as an implantable material because it is harmless to a living body, and with good mechanical properties.…”

Sintering of the Tricalcium Phosphate-Titania-Magnesium Fluoride Composites

“…Besides, titania has attracted much attention due to its excellent ability to chemically bond with living hard tissue [16,17]. This happens through the formation of a bone mineral, such as tricalcium phosphate phase on the material surface that ultimately induces direct bonding with native bone tissue [18][19][20]. Thus, titania has been attracting attention as an implantable material because it is harmless to a living body, and with good mechanical properties.…”

“…Thus, titania has been attracting attention as an implantable material because it is harmless to a living body, and with good mechanical properties. Moreover, titania is an attractive material, applicable to various fields, such as biomedical applications [16][17][18][19][20]. Furthermore, the titania is considered as having excellent biocompatibility, manifested in various biomedical applications [16][17][18][19][20].…”