0.75 g of as-treated BaTiO3 and 0.084 g of Sr(OH)2·8H2O (> 94%, Alfa Aesar, USA) were homogeneously ground and mixed using a pestle and mortar. For each experiment, the mixture was loaded into a 12.7 mm diameter die and uniaxially pressed under 350 MPa, followed by preheating at 80 °C for 0.5 h for the homogeneous distribution of flux in the BaTiO3 powder. Then, the set temperature was increased to given temperatures (225, 250, 275 °C), using both a heater jacket and a press equipped with hot plates. The reaction temperature was held for 1 h and cooled to room temperature. The as-prepared samples after cold sintering were dried and stored in an oven at 200 °C. To investigate the difference between Sr(OH)2·8H2O and Ba(OH)2·8H2O, the aforementioned protocol was used to cold sinter BaTiO3 with Ba(OH)2·8H2O(> 98%, Alfa Aesar, USA) at 225 °C for 1h under 350 MPa.
0.75 g of as-treated BaTiO3 and 0.084 g of Sr(OH)2·8H2O (> 94%, Alfa Aesar, USA) were homogeneously ground and mixed using a pestle and mortar. For each experiment, the mixture was loaded into a 12.7 mm diameter die and uniaxially pressed under 350 MPa, followed by preheating at 80 °C for 0.5 h for the homogeneous distribution of flux in the BaTiO3 powder. Then, the set temperature was increased to given temperatures (225, 250, 275 °C), using both a heater jacket and a press equipped with hot plates. The reaction temperature was held for 1 h and cooled to room temperature. The as-prepared samples after cold sintering were dried and stored in an oven at 200 °C. To investigate the difference between Sr(OH)2·8H2O and Ba(OH)2·8H2O, the aforementioned protocol was used to cold sinter BaTiO3 with Ba(OH)2·8H2O(> 98%, Alfa Aesar, USA) at 225 °C for 1h under 350 MPa.
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