A kind of preparation method of tetragonal phase bismuth magnesium titanate-lead titanate based piezoelectric single crystal
A technology of bismuth magnesium titanate and lead titanate, which is applied in the field of piezoelectric single crystal and its growth, can solve the problem that it is difficult to meet the requirements of the material's service temperature
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Embodiment 1
[0042] The high-purity raw material Bi 2 o 3 , MgO, TiO 2 and Pb 3 o 4 According to the chemical formula 0.50Bi(Mg 1 / 2 Ti 1 / 2 )O 3 -0.50PbTiO 3 After the stoichiometric ratio ingredients are mixed uniformly by a ball mill, they are compacted by cold isostatic pressing. The briquette and the selected seed crystal with the orientation of (110) were placed in a platinum crucible, and the crucible was sealed and then placed in a crucible drop furnace for crystal growth. First, it was kept at a temperature of 700 °C for 20 h, and then continued to heat up to Heat at 1300°C for 15 hours to melt the starting material, and adjust the position of the crucible to melt the top of the seed crystal. The temperature gradient of the growth interface is 20°C / cm, and the crucible is lowered at a rate of 0.1mm / h. Cool down to room temperature at a rate of / h to obtain a complete 0.50Bi(Mg 1 / 2 Ti 1 / 2 )O 3 -0.50PbTiO 3 single crystal;
[0043] The Curie temperature of the sample was ...
Embodiment 2
[0045] The high-purity raw material Bi 2 o 3 , MgO, TiO 2 and PbO according to the chemical formula 0.45Bi(Mg 1 / 2 Ti 1 / 2 )O 3 -0.55PbTiO 3 After the stoichiometric ratio ingredients are uniformly mixed by a ball mill, they are kept at a temperature of 750° C. for 15 hours, crushed and mixed uniformly, and then briquetted by a tablet machine. The briquette and the selected seed crystal with the orientation of (111) were placed in a platinum crucible, and the crucible was sealed and then placed in a crucible descending furnace for crystal growth. First, the temperature was kept at 800°C for 15h, and then the temperature continued to rise to Heat at 1350°C for 12 hours to melt the starting material, and adjust the position of the crucible to melt the top of the seed crystal. The temperature gradient of the growth interface is 30°C / cm, and the crucible is lowered at a rate of 0.3mm / h. Cool down to room temperature at a rate of / h to obtain a complete 0.45Bi(Mg 1 / 2 Ti 1 / 2 )...
Embodiment 3
[0048] The high-purity raw material Bi 2 o 3 , MgO, TiO 2 and PbO and Pb 3 o 4 The mixture according to the chemical formula 0.40Bi(Mg 1 / 2 Ti 1 / 2 )O 3 -0.60PbTiO 3 After the stoichiometric ratio ingredients are uniformly mixed by a ball mill, they are kept at a temperature of 850°C for 10 hours, smashed and mixed uniformly, and then briquetted by cold isostatic pressing. The briquette and the selected seed crystal with the orientation of (211) were placed in a platinum crucible. After the crucible was sealed, it was placed in a crucible descending furnace for crystal growth. It was first kept at a temperature of 1000 ° C for 12 h, and then continued to heat up to Heat at 1380°C for 8 hours to melt the starting material, and adjust the position of the crucible to melt the top of the seed crystal. The temperature gradient of the growth interface is 40°C / cm, and the crucible is lowered at a rate of 0.4mm / h. / h speed cooling to room temperature, the complete 0.40Bi(Mg 1 / 2...
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