Rare earth oxide solid solution ceramic scintillator and preparation method thereof

A technology of rare earth oxides and scintillators, which is applied in the field of ceramic scintillation materials, can solve the problems of reducing material density and absorbing radiation, reducing detector resolution, and reducing UV emission intensity, achieving excellent scintillation performance, cost reduction, The effect of low equipment requirements

Inactive Publication Date: 2009-06-17
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above methods all make Gd 2 o 3 : The scintillation performance of Eu becomes worse, too much LiCl or Y is added 2 o 3 It reduces the density of the material and the ability to absorb rays, and at the same time reduces the resolution of the detector. For example, GE company incorporates Y 2 o 3 Ob

Method used

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  • Rare earth oxide solid solution ceramic scintillator and preparation method thereof
  • Rare earth oxide solid solution ceramic scintillator and preparation method thereof
  • Rare earth oxide solid solution ceramic scintillator and preparation method thereof

Examples

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Embodiment 1

[0034] Preparation of Gd 1.1 Lu 0.4 Y 0.4 Eu 0.1 o 3 Ceramics, Gd(NO 3 ) 3 :Lu(NO 3 ) 3 :Y(NO 3 ) 3 :Eu(NO 3 ) 3 =0.55:0.2:0.2:0.05 Prepare mixed nitrate solution, the total concentration of rare earth ions in the mixed solution is 0.5mol / l. A mixed solution of ammonia water with a concentration of 2 mol / l and ammonium bicarbonate with a concentration of 0.5 mol / l is used as the precipitant. Gradually titrate the precipitant into the mixed rare earth nitrate solution, keep stirring, and continuously produce white flocculent precipitation, stop the titration when the pH of the solution reaches 8, continue stirring for 30 minutes, age, filter, and then use the precipitates separately Ionized water and absolute ethanol were washed 3 times each, dried in an oven for 24 hours, calcined, and ground to obtain a nanoscale cubic rare earth oxide solid solution ceramic powder, as shown in the attached figure 1 Shown is the XRD pattern of the powder, the powder particles are...

Embodiment 2

[0039] Preparation of Gd 1.2 Lu 0.2 Y 0.4 Eu 0.2 o 3 Ceramics, Gd(NO 3 ) 3 :Lu(NO 3 ) 3 :Y(NO 3 ) 3 :Eu(NO 3 ) 3 =0.6:0.1:0.2:0.1 Prepare mixed nitrate solution, the total concentration of rare earth ions in the mixed solution is 0.5mol / l. A mixed solution of ammonia water with a concentration of 2 mol / l and ammonium bicarbonate with a concentration of 0.5 mol / l is used as the precipitant. Gradually titrate the precipitant into the mixed rare earth nitrate solution, keep stirring, and continuously produce white flocculent precipitation, the pH of the solution reaches 9 when the titration ends, continue to stir for 30 minutes, age, filter, and then use the precipitates separately Washing with deionized water and absolute ethanol three times each, drying in an oven for 24 hours, calcining, and grinding to obtain nanoscale cubic rare earth oxide solid solution ceramic powder, the powder particles are nearly spherical and uniform. The calcination temperature is 700° C...

Embodiment 3

[0043] Preparation of Gd 0.2 Lu 0.8 Y 0.98 Eu 0.02 o 3 Ceramics, Gd(NO 3 ) 3 :Lu(NO 3 ) 3 :Y(NO 3 ) 3 :Eu(NO 3 ) 3 =0.1:0.4:0.49:0.01 Prepare mixed nitrate solution, the total concentration of rare earth ions in the mixed solution is 0.5mol / l. A mixed solution of ammonia water with a concentration of 2 mol / l and ammonium bicarbonate with a concentration of 0.5 mol / l is used as the precipitant. Gradually titrate the precipitant into the mixed rare earth nitrate solution, keep stirring, and continuously produce white flocculent precipitation, the pH of the solution reaches 9 when the titration ends, continue to stir for 30 minutes, age, filter, and then use the precipitates separately Washing with deionized water and absolute ethanol three times each, drying in an oven for 24 hours, calcining, and grinding to obtain nanoscale cubic rare earth oxide solid solution ceramic powder, the powder particles are nearly spherical and uniform. The calcination temperature is 80...

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Abstract

The invention discloses a rare earth oxide solid solution ceramic scintillator and a preparation method thereof. The main component of the ceramic scintillator is Gd2xLu2yY2(1-x-y-z)Eu2zO3 (the x is more than or equal to 0.1 and less than or equal to 0.6, the y is more than or equal to 0.1 and is less than or equal to 0.4, and the z is more than or equal to 0.01 and less than or equal to 0.1), and the ceramic scintillator has a crystal structure with a cubic Ia3 point group. Ceramic powder can be synthesized by a chemical coprecipitation method. The coprecipitation method adopts ammonia, ammonium hydrogen carbonate or a mixed solution of the ammonium water and the ammonium hydrogen carbonate as a precipitating agent, titrates the precipitating agent into a solution of gadolinium nitrate, lutecium nitrate, yttrium nitrate and europium nitrate to obtain a precipitate, and then the precipitate is dried and calcined to obtain nano-powder. The obtained powder is pressed into a ceramic blank through an isostatic compaction method, then the pressureless sintering is performed in vacuum or hydrogen atmosphere, the sintering temperature is between 1,600 and 1,900 DEG C, transparent Gd2xLu2yY2(1-x-y-z)Eu2zO3 ceramic can be obtained, a ceramic product with the needed dimension is prepared after the cutting, grinding and polishing, and the transmission rate of the ceramic in a visible region (400-800 nanometers) is more than or equal to 65 percent. The ceramic scintillator emits red light with a main wavelength of 610 nanometers under the excitation of ultraviolet light or X rays, and can be used for scintillating materials of imaging and detection of medical and industrial X rays.

Description

technical field [0001] The invention relates to a functional material and its preparation technology, in particular to a rare earth oxide solid solution ceramic scintillator and its preparation method. The invention belongs to the field of ceramic scintillation materials. Background technique [0002] Rare earth ion Eu 3+ doped cubic Gd 2 o 3 It is a very important luminescent and scintillation material. As early as 1964, Bril and Wanmaker studied its luminescent properties, and in recent years it has received widespread attention as a phosphor and thin film material. As a high-efficiency red phosphor, it has important application prospects in plasma imaging, high-definition television, projection television, flat panel display and other fields. As a scintillator, Gd 2 o 3 :Eu is a ceramic scintillator with excellent comprehensive performance, and it will have a very important application prospect in the fields of high-resolution X-CT, X-ray security inspection imagin...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/505C04B35/622
Inventor 秦来顺史宏声舒康颖吴云涛
Owner CHINA JILIANG UNIV
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