Ge-Doped Decoloration Technology of Zinc Tungstate

Zinc tungstate is often used in Ge-doped decoloration technology, zinc tungsten single crystal Ge-doped decoloration technology belonging tungstate crystal production series areas. This technology generally doping Sb2O3 or Bi2O3 or silver as the toner, but the common deficiency is not drawn out of the large size of colorless crystals.
After the studies found, using GeO2 as doped material, when the weight ratio of ZnO:WO3:GeO2 is 1:1-X:X, X between 0.05% to 0.1%, the pulling rate in 1 ~ 3mm/h, rotation rate at 20 ~ 30 rev/min, the cooling rate of after growth at 150~200 ℃/ h can be achieved large ZnWO4 colorless crystals. Besides light-emitting properties slightly better than the ZnWO4, energy resolution up to about 12.9%.
And when preparing zinc tungstate crystal use Nb2O5 as doped material, the total weight ratio of between it and ZnWO4 is 2 × 10 ~ 1 × 10, the pulling rate at 3 ~ 6mm/h, rotation rate at 20~30 rev/min, the cooling rate after growth at 40~60 ℃/h, to obtain a colorless crystal large zinc tungsten, but the light-emitting properties is no different with zinc tungsten, the energy resolution up to 13 % to 14%.

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