Intrinsic luminescent scintillation crystal magnesium tantalum oxide, and preparation method and use thereof

A technology of scintillation crystals and magnesium tantalate, which is applied in the chemical industry, can solve problems such as cracks and low-quality crystal rods, and achieve the effects of simple operation, stable crystallization quality, and stable structure

Active Publication Date: 2018-06-29
SHANGHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2015, Li Liang et al. used the optical floating zone method to grow a crystal with a maximum size of Φ4mm×L12mm, but the quality of the crystal rod was not high and there were a lot of cracks. The performance research only involved Raman spectroscopy at room temperature and variable temperature

Method used

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  • Intrinsic luminescent scintillation crystal magnesium tantalum oxide, and preparation method and use thereof
  • Intrinsic luminescent scintillation crystal magnesium tantalum oxide, and preparation method and use thereof
  • Intrinsic luminescent scintillation crystal magnesium tantalum oxide, and preparation method and use thereof

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Embodiment 1

[0027] 1) High-purity powder MgO (99.9995%) and Ta 2 o 5 (99.99%) batching according to the molar ratio of 4.04:1, ball milling for 1 hour, filling and pounding the mixed powder into a long plastic tube, sealing and clamping the plastic tube between two metal semicircular thin tubes Fix it, put it into an isostatic press and hold it for 1 hour under a pressure of 350MPa, remove the plastic tube to make a raw material rod with a length of about 10cm and a diameter of 5mm;

[0028] 2) Put the raw material rod prepared in step 1) into a long crucible, sinter in a muffle furnace, raise the temperature to 1400 °C at a rate of 1400 °C / h, keep it warm for 2 hours, and drop it at a rate of 1400 °C / h to room temperature, that is, a dense and uniform polycrystalline rod with equal diameter is produced, and a part is intercepted for powder XRD characterization, as shown in figure 2 shown;

[0029] 3) with the pure phase Mg that step 2) makes 4 Ta 2 o 9 Part of the polycrystalline ...

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Abstract

The invention provides a scintillation crystal magnesium tantalum oxide. The chemical formula of the crystal is Mg4Ta2O9, the crystal belongs to a hexagonal crystal system and has an ilmenite structure, the scintillation light yield is 16000 photons/M eV, the decay time is 5 [mu]s, and the energy resolution is 6.2%. The invention also provides a use of the Mg4Ta2O9 as a scintillation crystal material, and a preparation method of the Mg4Ta2O9. The preparation method comprises the following steps: MgO and Ta2O5 which are used as initial powders are uniformly mixed according to a molar ratio of 4.04:1, and are processed to form a raw material rod, the raw material rod is pre-sintered to obtain a pure-phase, dense and uniform polycrystalline rod, and the colorless and transparent rod-shaped crystal having a size of phi 4 mm * L 62 mm grows by adopting an optical floating zone technology. The method has the advantages of stable melting zone, simplicity in operation, effectiveness in inhibition of the volatilization of MgO, and maintenance of uniform composition and stable crystal quality.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a novel scintillation crystal material, magnesium tantalate, whose chemical formula is Mg 4 Ta 2 o 9 , including its intrinsic luminescence, scintillation properties, polycrystalline rod preparation and crystal growth, etc. Background technique [0002] Inorganic scintillation crystals are a class of optoelectronic functional materials that are widely used in high-energy physics, nuclear physics, space physics, nuclear medicine, geological exploration, security inspection, and national defense industries. With the rapid development of nuclear science and technology and other related technologies, its application fields are constantly expanding. Different application fields have different requirements for inorganic scintillators. The current development trend of scintillator crystals is high light output, high energy resolution, fast response and high density. Therefore, many tea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B13/00
CPCC30B13/00C30B29/30
Inventor 马云峰蒋毅坚徐家跃
Owner SHANGHAI INST OF TECH
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