Abstract
The stability of Ba2Ti9O20 phase was investigated by sintering of BaO⋅4.5TiO2 binary specimen and BaO⋅4.29TiO2⋅0.21SnO2 ternary specimen. When BaO⋅4.5TiO2 specimen was sintered at 1250°C, 1300°C and 1350°C, BaTi4O9+TiO2. BaTi4O9+Ba2Ti9O20+TiO2 and BaTi4O9+TiO2 phases were detected. respectively. On the other hand, the BaO⋅4.29TiO2⋅0.21SnO2 specimen formed BaTi4O9+Ba2Ti9 O20+TiO2, irrespective of sintering temperature between 1250°C and 1375°C. Corresponding to the above mentioned result, the Q values of BaO⋅4. 5TiO2 specimen sintered at 1250°C-1275°C, 1300°C-1325°C and 1350°C-1375°C are confirmed to be about 6000, about 4500 and about 6000. respectively. and BaO⋅4.29TiO2⋅0.21SnO2 specimen showed nearly constant Q value of about 4000. irrespective of sintering temperature between 1250°C and 1375°C.
