On the determination of the CuO-BaCuO2 and CuO-YCuO2.5 binary phase diagrams

Low-Fire Processing of BaTiO3 with BaCuO2–CuO

“…The above results clearly indicate that with the presence of BCC, the densification temperature of pure BT can be reduced from 1300-1350 C [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] to 1050 C. Moreover, the addition of BCC instead of BC is more effective in enhancing the densification of BT. This is because BCC has a melting point of 920 C, 23) which is much lower than that of BC at 1030 C. 23) Note that the melting points of BC and BCC were also confirmed by differential thermal analysis (DTA) at a heating rate of 5 C/min in air. Since BCC is much more effective in promoting densification of pure BT at lower temperatures, the following discussion will be focused on BT with BCC.…”

“…Note that the dense BT substrate was prepared by firing pure BT green compact at 1350 C for 2 h, and a relative sintered density greater than 97% was obtained. Since BCC melts and spreads over the BT surface when the temperature is higher than its eutectic point of 926 C, 23) a small contact angle of less than 10 (Fig. 5) and an intimate contact between BCC and BT substrate are obtained.…”

“…The system of BaCuO 2 -CuO (BCC) was chosen as a sintering aid to BT because it forms an eutectic of BCC at 926 C. 23,24) Note that BaCuO 2 (BC) was not used in this study because of its high melting point of 1026 C. 23) Since the densification of BCC+BT was accomplished by liquidphase sintering, the effects of critical factors including BCC content and the chemical reaction between BT and BCC on densification kinetics were studied. The effects of BCC content on dielectric properties of fired BCC+BT dielectric were also investigated.…”

Effects of CuO additive on structure and electrical properties of low-temperature sintered Ba0.98Ca0.02Zr0.02Ti0.98O3 lead-free ceramics

“…Many researchers are devoted to reducing the sintering temperature of ceramics by introducing various kinds of sintering aids, either because of the sintering aids themselves have a low melting point [28], or because of the formation of a low-temperature eutectic point [19][20][21]27,29]. In this study, the BaO is supposed to react with CuO and from the eutectic liquid phase at around 925 1C [26]. So the sintering temperature could be reduced with the addition of CuO.…”

Compatible phases of the Y2O3–CuO–Cu2O system in air

“…It can be formed with higher oxygen content to Y 2 Cu 2 O 6 at 800 °C under nearly 400 bar of oxygen. Nevriva et al 5 ' 6 reported that in oxygen these invariant points occur at 1180 and 1075 °C, respectively, and the eutectic occurs for the composition containing initially 7.5 mole% %Y 2 O 3 . Roth et al 3A constructed the tentative diagram of the Y 2 O 3 -CuO-Cu 2 O system and showed Y 2 Cu 2 O 5 to melt incongruently at about 1135 °C.…”