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Preparation of divalent cerium ion dosed rare earth silicate scintillating crystal

A rare earth silicate, ionic rare earth technology, applied in crystal growth, chemical instruments and methods, single crystal growth and other directions, can solve the problems of crystal scintillation performance decline and unfavorable crystal growth, and achieve the effect of improving light output

Inactive Publication Date: 2004-12-08
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] A small amount of oxygen is produced, which is unfavorable to the growth of the crystal, often causing more defects in the crystal and reducing the scintillation performance of the crystal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: prepare Ce 0.0002 Lu 1.9998 SiO 5 Rare earth silicate scintillation crystal

[0034] Concrete preparation steps are as follows:

[0035] Weigh the dried 0.9998mol Lu with a purity of 99.999% 2 o 3 , 0.99995mol SiO 2 , 0.0002mol CeO 2 and 0.000017 mol Si 3 N 4 Raw materials, a total of 1300g;

[0036] Fully mix the weighed raw materials into a uniform powder;

[0037] Mix the raw materials evenly, and press the mixed powder into φ78×10mm under the pressure of 1Gpa 3 The material cake is sintered at a temperature of 500°C for 15 hours to remove organic matter, water and low melting point impurities in the raw material;

[0038] Put the sintered block into φ80×50mm 3 In the iridium crucible, and put it into the pulling furnace, seal the furnace and evacuate to 5×10 -3 Pa; under this vacuum degree, the medium frequency induction heating method is used to heat up the chemical material at a heating rate of 400°C / hr;

[0039] When the material bl...

Embodiment 2

[0043] Embodiment 2: preparation Ce 0.04 Gd 1.96 SiO 5 Rare earth silicate scintillation crystal

[0044] Concrete preparation steps are as follows:

[0045] Weigh dry 0.98mol Gd with a purity of 99.999% 2 o 3 , 0.99mol SiO 2 , 0.02molCeO 2 and 0.0033mol Si 3 N 4 Raw materials, a total of 1300g;

[0046] Repeat process step and in the above-mentioned embodiment 1;

[0047] Continue to heat up to 1980°C at a heating rate of 400°C. / hr. After all the materials are melted, keep the temperature within this temperature range for 1.5 hours;

[0048] Slowly fill the furnace with N 2 gas, keep the pressure of the furnace at 1.25atm, and then at the crystallization temperature of 1900°C, use the b-axis Gd 2 SiO 5 The seed crystal is grown by the pulling method: the growth rate is 2.5mm / hr, and the crystal rotation speed is about 40RPM. After the crystal is seeded, diameter reduced, shouldered, equal diameter, terminated, and cooled, the crystal growth is completed. ...

Embodiment 3

[0050] Embodiment 3: preparation Ce 0.01 Y 1.99 SiO 5 Rare earth silicate scintillation crystal

[0051] Concrete preparation steps are as follows:

[0052] Weigh dry 0.995mol Gd with a purity of 99.999% 2 o 3 , 0.998mol SiO 2 , 0.05molCeO 2 and 0.00084mol Si 3 N 4 Raw materials, a total of 1300g;

[0053] Repeat process step and in the above-mentioned embodiment 1;

[0054] Continue to heat up to 2000°C at a heating rate of 400°C. / hr. After all the materials are melted, keep the temperature within this temperature range for 2 hours;

[0055] Slowly fill the furnace with Ar gas to keep the pressure of the furnace at 1 atm, and then at the crystallization temperature of 1980 ° C, use the b-axis Y 2 SiO 5 The seed crystal is grown by the pulling method. During the crystal growth process, the growth rate was 1 mm / hr, and the crystal rotation speed was about 25 RPM. After the crystal has undergone the procedures of seeding, diameter reduction, shouldering, equa...

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Abstract

Preparation of trivalancy cerium dosed flash crystals of rare earth silicates achieves by inducing strong reductive Si3N4 as raw material with equivalent weight equal to CeO2 to reduce it into Ce2O3 in heating procedure and growth of crystal, and to generate Ce3+ containing flash crystal, with few Ce4+ ions, of rare earth silicates by reacting with oxides such as SiO2 and Re2O3: Ce2xRe2(1 - x)SiO5, wherein, 0.0001% <= x <= 0.02%, Re = one or two of Gd, Lu and Y, so as to enhance light output of flash crystal.

Description

Technical field: [0001] The invention relates to the field of crystal growth, particularly a kind of doping trivalent cerium ion (Ge 3+ ) preparation method of rare earth silicate scintillation crystal, the chemical general formula of rare earth silicate crystal is Ce 2x Re 2(1-x) SiO 5 (0.0001≤X≤0.02), where Re represents one of the three rare earth elements such as Gd, Lu, and Y, or a combination of any two elements in any proportion, the same below, no further note). Specifically related to the initial oxide raw material (Re 2 o 3 , CeO 2 , SiO 2 ) with CeO 2 Equimolar equivalent of Si 3 N 4 The raw material is a preparation process for growing rare earth silicate scintillation crystals containing trivalent cerium ions by using the pulling method, the crucible drop method and other melt growth methods. Background technique: [0002] BGO scintillation crystal is a traditional inorganic scintillation crystal, and its biggest advantage is that it has a large densit...

Claims

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Application Information

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IPC IPC(8): C30B15/00C30B29/34
Inventor 赵广军介明印徐军庞辉勇何晓明
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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