Bismuth-based halide ceramic material, preparation method and X-ray detector

A technology of ceramic materials and halides, which is applied in the field of bismuth-based halide ceramic materials, preparation, and X-ray detectors, can solve the problems of environmental and biological hazards, unfavorable mass production, and high noise level of detectors, and achieve sensitive X-ray response , Good radiation resistance and low detection limit

Inactive Publication Date: 2019-10-15
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These materials generally contain lead, which is harmful to the environment and organisms, and there is ion migration. The ion migration caused by the working electric field is not conducive to the control of device leakage current, resulting in a high noise level of the detector, which limits the improvement of detector sensitivity. detrimental to the long-term stability of the device
In addition, the crystal growth process is not simple enough, which is not conducive to commercial promotion and use.
[0005] However, bismuth-based perovskite materials are non-toxic and harmless to the environment. The existing bismuth-based perovskite materials only have Cs 2 AgBr 6 For the field of ray detection, Cs 2 AgBr 6 The growth of single crystal by cooling method is uncontrollable, and the existing Cs 2 AgBr 6 Ceramics are made by pressing the powder obtained by grinding their single crystals. Because the source of the raw material single crystals is not easy, it is not conducive to mass production

Method used

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  • Bismuth-based halide ceramic material, preparation method and X-ray detector
  • Bismuth-based halide ceramic material, preparation method and X-ray detector
  • Bismuth-based halide ceramic material, preparation method and X-ray detector

Examples

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Embodiment 1

[0027] This embodiment provides a method for obtaining a highly sensitive X-ray detector using a bismuth-based perovskite ceramic material.

[0028] Described X-ray detector, its structure is as attached figure 1 shown. It consists of bismuth-based halide ceramics 2 and electrodes 1 and 3 at both ends.

[0029] Among them, bismuth-based halide ceramics 2 are obtained by tableting method, and the shape after pressing is as follows figure 2 . Then metal electrodes are vapor-deposited on both ends of the bismuth-based halide ceramics to prepare an X-ray detector. The electrode material is gold, silver, copper, aluminum, platinum, palladium, graphite, conductive carbon and the like.

[0030] image 3 For the phase analysis result data of the corresponding sample, the displayed material is (CH 3 NH 3 ) 3 Bi 2 I 9 , Hexagonal structure, belonging to the P63 / mmc space group. Figure 4 It is the resistivity test result data of the ceramic sheet, and the result shows that (...

Embodiment 2

[0032] This example provides a method for preparing bismuth-based halide ceramic materials. The ceramic powder is prepared by the anti-solvent method or the grinding method, and the ceramic sheet is prepared by the tabletting method, specifically:

[0033] The process of preparing powder by anti-solvent method is as follows:

[0034] BiI 3 (bismuth iodide) and CH 3 NH 3 I (methylaminoiodonium salt) configuration (CH 3 NH 3 ) 3 Bi 2 I 9 Precursor solution, the solution concentration is 0.2M-2M (the preferred condition is 0.5-1M), the solvent can be one or more of GBL, DMF, DMSO, etc., take the supernatant, and keep stirring the centrifuged solution In the case of dropping into the anti-solvent, the anti-solvent can be one or more of chlorobenzene, ethyl acetate, ethanol, and isopropanol, and the powder is obtained after drying, and the size of the powder is 0.1-10 microns. Among them, BiI 3 (bismuth iodide) can be replaced by BiX (bismuth halide), CH 3 NH 3 I (methylam...

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Abstract

The invention discloses a bismuth-based halide ceramic material, a preparation method and an X-ray detector. The X-ray detector consists of bismuth-based halide ceramic and electrodes at the two endsthereof, wherein the bismuth-based halide ceramic is a ceramic sheet prepared from the bismuth-based halide ceramic material by a tableting method, and metal electrodes are arranged at the two ends thereof through vapor deposition. Not only is the bismuth-based halide ceramic material provided by the invention easy to prepare, environment-friendly, high in stability and high in electrical resistivity, but also the prepared X-ray detector is high in high pressure resistance, good in radiation resistance, sensitive to X-ray response and low in lower detection limit.

Description

technical field [0001] The invention relates to the technical field of halide ceramic materials, in particular to a bismuth-based halide ceramic material, a preparation method and an X-ray detector. Background technique [0002] X-rays are widely used in many fields such as environmental monitoring, safety inspection, nuclear science and technology, medical imaging, industrial non-destructive testing, space radiation detection, and high-energy physics. Nuclear radiation detectors for X-ray detection are one of the key technologies in the application of X-rays. Therefore, the continuous development of X-ray detection materials and X-ray detection technology is an important development direction in the field of X-ray research. [0003] The third-generation X-ray detectors, which emerged in the early 1960s, are semiconductor detectors with faster response speed, stronger energy spectrum resolution, wider energy linear range and more compact system structure. It is obviously su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/622G01T1/16
CPCC04B35/5152C04B35/622G01T1/16
Inventor 张文华郑霄家帖舒婕赵伟龙继东
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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