Bismuth silicate-germanate mixed crystal and preparation method thereof
A silicon germanic acid and mixed crystal technology, applied in the field of crystal growth, can solve the problem of low light output and achieve the effects of uniform distribution, low production cost and simple equipment
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Embodiment 1
[0028] With high purity 1789g Bi 2 o 3 , 345g of SiO 2 and 2g of GeO 2 as the initial raw material, that is, according to Bi 2 o 3 , SiO 2 and GeO 2 The molar ratio is 2:2.99:0.01 for batching, the initial raw materials are fully mixed, and pre-fired at 650°C for 10h. Then, the mixed initial raw materials are ground to a particle size of 450 nm, and pre-calcined at 800° C. for 10 h to obtain polycrystalline raw materials. BSO crystals with a diameter of 10 mm and an orientation of were used as seed crystals. The pre-fired polycrystalline material and seed crystals were placed in a cylindrical platinum crucible, which was airtight, and placed in a vertical Bridgman crystal growth furnace. Adjust to an appropriate position so that the raw material is in the high temperature zone of the furnace, the furnace temperature is controlled at 1050°C, the temperature gradient of the solid-liquid interface is maintained at 40°C / cm, and the growth rate is controlled at 0.2mm / h. Af...
Embodiment 2
[0030] With high purity 1985g Bi 2 o 3 , 192g of SiO 2 and 334g of GeO 2 as the initial raw material, that is, according to Bi 2 o 3 , SiO 2 and GeO 2 The molar ratio is 2:1.5:1.5 for batching, the initial raw materials are fully mixed, and pre-fired at 700 ° C for 8 hours. Then, the mixed initial raw materials were ground to a particle size of 550 nm, and pre-calcined at 850° C. for 8 hours to obtain polycrystalline raw materials. The BSGO crystal with a diameter of 10 mm and an orientation of was used as a seed crystal, and the pre-fired polycrystalline material and seed crystal were placed in a rectangular cylindrical platinum crucible, which was airtight and placed in a vertical Bridgman crystal growth furnace . Adjust to an appropriate position so that the raw material is in the high temperature zone of the furnace, the furnace temperature is controlled at 1100°C, the temperature gradient of the solid-liquid interface is maintained at 30°C / cm, and the growth rate...
Embodiment 3
[0032] With high purity 3728g Bi 2 o 3, 3g of SiO 2 and 1251g of GeO 2 as the initial raw material, that is, according to Bi 2 o 3 , SiO 2 and GeO 2 The molar ratio is 2:0.01:2.99 for batching, the initial raw materials are fully mixed and uniform, and pre-calcined at 730 ° C for 6 hours to obtain polycrystalline raw materials. Then the mixed initial raw materials were ground to a particle size of 600 nm, and pre-calcined at 850° C. for 8 h. BGO crystals with a diameter of 10 mm and an orientation of were used as seed crystals, and the pre-fired polycrystalline material and seed crystals were placed in 4 cylindrical platinum crucibles, which were airtight and placed in a vertical Bridgman crystal growth furnace . Adjust to an appropriate position so that the raw material is in the high temperature zone of the furnace, the furnace temperature is controlled at 1150°C, the temperature gradient of the solid-liquid interface is maintained at 50°C / cm, and the growth rate is...
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