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Glass film containing rare-earth-ion-doped calcium iodide microcrystalline and preparation method thereof

A technology of rare earth ions and glass thin films, which is applied in the field of rare earth ion doped calcium iodide microcrystal glass thin films and its sol-gel preparation, can solve problems such as device development limitations, overcome incomplete uniformity, and promote the formation of , prevent the effect of decomposition and volatilization

Inactive Publication Date: 2016-02-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually thin film and fibrous materials are the most suitable raw materials for making such devices, so the current form of scintillation materials will have great restrictions on the development of future devices

Method used

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  • Glass film containing rare-earth-ion-doped calcium iodide microcrystalline and preparation method thereof
  • Glass film containing rare-earth-ion-doped calcium iodide microcrystalline and preparation method thereof
  • Glass film containing rare-earth-ion-doped calcium iodide microcrystalline and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of the glass film containing rare earth ion-doped calcium iodide microcrystals comprises the following specific steps:

[0040] (1) Prepare raw materials in molar ratio: tetraethoxygermanium: tri-n-butyl borate: calcium iodide: europium iodide = 70: 20: 16: 4, take by weighing a total amount of 20 grams of analytically pure Each preparation raw material, stand-by;

[0041] (2), the hydrolysis of tetraethoxygermanium: the tetraethoxygermanium weighed in the step (1) is dissolved in dehydrated alcohol, and the mol ratio of dehydrated alcohol and tetraethoxygermanium is 2.5: 1, fast Add acetylacetone, the volume ratio of tetraethoxygermanium to acetylacetone is 1:1, and carry out strong magnetic stirring, gradually drop in distilled water, the molar ratio of distilled water to tetraethoxygermanium is 0.8:1, adjust with concentrated nitric acid The pH value reaches 4-5, and the hydrolysis reaction is carried out at room temperature for 1 hour to prep...

Embodiment 2

[0051] It is basically the same as Example 1, except that in the step (1), the raw materials are prepared according to the following molar ratio: tetraethoxygermanium: tri-n-butyl borate: calcium iodide: cerium iodide=74: 30: 10: 1, each preparation raw material is weighed respectively; In the step (7), the pulling speed of the glass substrate in the gel solution is controlled at 1 mm / s, and the pulling is repeated 5 times, and the interval between each pulling is 15 minutes; In (8), heat up to 100°C at a rate of 50°C per hour, then heat up the furnace to 340°C at a rate of 50°C per hour; in step (9), gradually heat up the furnace to 600°C, and at this temperature The next reaction treatment was 2 hours. The molar composition of the film composition is: 74GeO 2 -15B 2 o 3 -10CaI 2 -1CeI 3 .

[0052] For the prepared Ce-containing 3+ Ion-doped calcium iodide crystallite glass film was tested for performance, and the XRD pattern of the glass film after hydrogen iodide tre...

Embodiment 3

[0054] It is basically the same as Example 1, except that in the step (1), the raw materials are prepared according to the following molar ratio: tetraethoxygermanium: tri-n-butyl borate: calcium iodide: terbium iodide=72: 28: 12: 2. Weigh each preparation raw material respectively; in step (7), the pulling speed of the glass substrate in the gel solution is controlled at 0.6 mm / s, and the pulling is repeated 3 times, and the interval between each pulling is 15 minutes; In (8), heat up to 100°C at a rate of 40°C per hour, then heat up the furnace to 340°C at a rate of 40°C per hour; in step (10), gradually heat up the furnace to 590°C, and at this temperature The next reaction treatment was 3 hours. The molar composition of the film composition is: 72GeO 2 -14B 2 o 3 -12CaI 2 -2TbI 3 .

[0055] For prepared Tb-containing 3+ Ion-doped calcium iodide crystallite glass film was tested for performance, and the XRD pattern of the glass film after hydrogen iodide treatment wa...

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Abstract

The invention discloses a glass film containing rare-earth-ion-doped calcium iodide microcrystalline and a preparation method thereof. The technical scheme is characterized in that the glass film comprises the following compositions in percent by mole: 70-74 mol% of germanium dioxide, 10-15 mol% of boric oxide, 10-16 mol% of calcium iodide, and 1-4 mol% of a rare-earth iodide, wherein the rare-earth bromide is one of europium(II) iodide, cerium (III) iodide and terbium iodide. The advantages comprise that a sol-gel technology is a low-temperature wet-chemical-process glass preparation technology, the glass is obtained through hydrolysis of a precursor raw material and a polymerization chemical reaction process, the film material can be prepared under a certain liquid viscosity condition, and the low-temperature synthesis condition is capable of effectively preventing the iodide raw material from being decomposed and volatilized; and because of volatilization and decomposition of the solvent, certain micropores are generated in the glass prepared through the sol-gel method, and the micropores provide good environment for generation of nanometer iodide microcrystalline, and thus crystallized-particle nonuniformity and glass devitrification caused by incomplete uniformity of melt-glass chemical compositions and crystallization processing temperature are overcome to a certain degree.

Description

technical field [0001] The present invention relates to a rare-earth ion-doped glass-ceramic film, in particular to a rare-earth ion-doped calcium iodide (CaI) used as a scintillation material 2 ) Microcrystalline glass film and its sol-gel preparation method. Background technique [0002] Scintillation material is a photofunctional material that can emit visible light under the excitation of high-energy rays (such as x-rays, γ-rays) or other radioactive particles, and can be widely used in nuclear medicine diagnosis, security inspection, anti-terrorism, high-energy physics and geological exploration and other fields. In recent years, with the rapid development of fields such as medical imaging and security inspection, there is a large demand for new scintillation materials with high performance. Excellent scintillation materials mainly have the following properties: high luminous efficiency, high material density, fast fluorescence decay, good radiation resistance and low...

Claims

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Application Information

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IPC IPC(8): C03C17/22
Inventor 王成夏海平江东升冯治刚张健何仕楠汤庆阳盛启国
Owner NINGBO UNIV
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