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Oxygenating and decolorizing growth method of cadmium tungstate scintillation single crystal

A growth method, cadmium tungstate technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of low luminous output, reduction of flickering luminescence performance, etc., to improve growth quality, avoid luminous self-absorption, improve Effect of optical quality and luminous performance

Inactive Publication Date: 2019-12-24
宁波阳光和谱光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phenomenon of bluish or even blackening of cadmium tungstate single crystal is the result of different degrees of lattice oxygen vacancies in the crystal, and different degrees of self-absorption of excited luminescence due to single crystal coloring. The performance will be reduced accordingly, and the blue-black cadmium tungstate single crystal has only a very low luminous output

Method used

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  • Oxygenating and decolorizing growth method of cadmium tungstate scintillation single crystal
  • Oxygenating and decolorizing growth method of cadmium tungstate scintillation single crystal
  • Oxygenating and decolorizing growth method of cadmium tungstate scintillation single crystal

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Effect test

Embodiment 1

[0041] Using cadmium oxide (99.99%) and tungsten oxide (99.99%) as the initial raw materials, according to the molar ratio of cadmium oxide: tungsten oxide = 1:1, the mixture is prepared by grinding and mixing, and the cadmium tungstate polycrystalline is prepared by two-step solid phase sintering The material is about 3500g. The first step of solid phase sintering condition is sintering at 800°C for 6 hours. The obtained sintered material is ground again and then carried out the second step of solid phase sintering at 900°C. The sintering time is 6 hours; the Na 2 o 2 Additives are evenly mixed with cadmium tungstate polycrystalline material, Na 2 o 2 The addition amount is 0.08mol% of the cadmium tungstate polycrystalline material. Using a platinum crucible with the same specification as Comparative Example 1, the oriented seed crystal was installed in the lower part of the crucible, and the upper part of the crucible was filled with Na 2 o 2 The polycrystalline materia...

Embodiment 2

[0043] Using cadmium oxide (99.99%) and tungsten oxide (99.99%) as the initial raw materials, according to the molar ratio of cadmium oxide: tungsten oxide = 1:1, the mixture is prepared by grinding and mixing, and the cadmium tungstate polycrystalline is prepared by two-step solid phase sintering The material is about 3500g. The first step of solid phase sintering condition is sintering at 900°C for 7 hours. The obtained sintered material is ground again and then carried out the second step of solid phase sintering at 1000°C. The sintering time is 5 hours; the Li 2 o 2 Additives are evenly mixed with cadmium tungstate polycrystalline material, Li 2 o 2 The addition amount is 0.1 mol% of the cadmium tungstate polycrystalline material. Using a platinum crucible of the same specification as Comparative Example 1, the orientation seed crystal was installed in the lower part of the crucible, and then the upper part of the crucible was filled with Li 2 o 2 The polycrystalline ...

Embodiment 3

[0045] Using cadmium oxide (99.99%) and tungsten oxide (99.99%) as the initial raw materials, according to the molar ratio of cadmium oxide: tungsten oxide = 1:1, the mixture is prepared by grinding and mixing, and the cadmium tungstate polycrystalline is prepared by two-step solid phase sintering The material is about 3500g. The first step of solid phase sintering condition is sintering at 950°C for 8 hours. The obtained sintered material is ground again and then carried out the second step of solid phase sintering at 1000°C. The sintering time is 5 hours; accurately weigh K 2 o 2 Additives are evenly mixed with cadmium tungstate polycrystalline material, K 2 o 2 The addition amount is 0.04mol% of the cadmium tungstate polycrystalline material. Using a platinum crucible with the same specifications as Comparative Example 1, the orientation seed crystal was installed in the lower part of the crucible, and then filled with K 2 o 2 The polycrystalline material, and then the...

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Abstract

The invention provides an oxygenating and decolorizing growth method of a cadmium tungstate scintillation single crystal. Cadmium tungstate polycrystalline powder is synthesized by adopting a solid-phase reaction. The method comprises the following steps: adding an alkali metal peroxide (M2O2) into the pre-synthesized polycrystalline powder, the adding dosage being 0.01-0.1% mol of the M2O2 for 1mol of polycrystalline powder; filling a platinum crucible with a cadmium tungstate polycrystalline material into which the M2O2 is added; under the condition that the platinum crucible is completelysealed, subjecting the cadmium tungstate polycrystalline material to a solid-phase reaction in a single crystal hearth, performing a lattice oxygenating reaction on the polycrystalline material by utilizing the strong oxidizing property of the additive M2O2, and growing the ultra-light-color large-size cadmium tungstate single crystal by combining a Bridgman method single crystal growth process. The method can effectively solve the problem of single crystal blackening and coloring caused by lattice oxygen atom deficiency, thereby obviously improving the optical quality and luminescence property of the cadmium tungstate scintillation single crystal.

Description

technical field [0001] The invention belongs to the technical field of single crystal growth. Cadmium tungstate single crystal is a kind of scintillation material with excellent luminescent characteristics. Aiming at the phenomenon of blackening and coloring caused by the lack of oxygen in the crystal lattice, the invention provides the oxygen supplement and elimination of cadmium tungstate single crystal. The color growth method can be applied to grow light-colored cadmium tungstate single crystals with excellent scintillation properties. Background technique [0002] Cadmium tungstate single crystal (CdWO 4 ) is a monoclinic crystal system, belonging to wolframite structure, space group P2 / C. Under the excitation of X-ray or γ-ray irradiation, cadmium tungstate single crystal has high luminous efficiency, high energy resolution and very weak luminous afterglow, and has a high resistance to radiation damage threshold and high material density. , non-deliquescence, is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C09K11/68C30B11/08
CPCC09K11/682C30B11/08C30B29/32
Inventor 陈红兵孙志刚成毓康
Owner 宁波阳光和谱光电科技有限公司
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