Bridgman-stockbarge process for growing scintillation crystal LaCl3:Ce3+

A crystal growth and process technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of easy oxidation, devitrification, and crystal optical scattering of melts

Inactive Publication Date: 2007-03-21
NINGBO UNIV +1
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Problems solved by technology

[0004] Due to the physical properties of rare earth halides, LaCl 3 : Ce 3+ The inherent key technical problems of crystal growth are: (1) usually commercially available reagents are LaCl containing water of crystallization 3 .7H 2 O and CeCl 3 .7H 2 O, and anhydrous chloride LaCl 3 and CeCl 3 It is easy to absorb moisture in the air; during the crystal growth process, hydrolyzed chlorides are prone to hydrolysis to generate oxychlorides and oxides, resulting in optical scatteri...

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  • Bridgman-stockbarge process for growing scintillation crystal LaCl3:Ce3+
  • Bridgman-stockbarge process for growing scintillation crystal LaCl3:Ce3+

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Embodiment Construction

[0020] Embodiments of the present invention enumerate as follows:

[0021] (1) Preparation of anhydrous chloride LaCl by chlorination roasting dehydration treatment 3 and CeCl 3 , according to 2mol% CeCl 3 doping concentration to prepare LaCl 3 : Ce 3+ Batch materials: Platinum foil with a wall thickness of 0.14 mm is used to process a cylindrical crucible with a lower volume of Φ10×70mm 3 , the upper volume is Φ30×240mm 3 , with a funnel-shaped center. Dimensions Φ9×40mm 3 The seed crystal is installed in the lower part of the crucible, and then the upper part of the seed crystal is filled with batch materials, the batch materials are dehydrated again, and then the two ends of the crucible are welded. During the crystal growth process, the crystal growth furnace was controlled at 940°C, and the crucible was first adjusted to an appropriate position to melt the raw material and the top of the seed crystal to form a stable solid-liquid interface with a temperature gradie...

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Abstract

The present invention is Bridgman-Stockbarge process of growing scintillation crystal LaCl3:Ce3+, and belongs to the field of monocrystal growing technology. The initial material LaCl3 .7H2O and CeCl3 .7H2O are first prepared into anhydrous chlorides LaCl3 and CeCl3 through chlorination, roasting and dewatering; and compounded material LaCl3:Ce3+ with proper CeCl3 doping concentration and small amount of active carbon powder blended as deoxidizer is then prepared. After filling the seed crystal and material are set inside platinum crucible and the crucible is sealed up, the crucible is set in crystal growing furnace at 920-980 deg.c for soldering the material to the seed crystal and forming solid-liquid interface of temperature gradient of 20-50 deg.c/cm, and the crucible is then fallen at the speed of 0.3-3 mm/hr to grow excellent LaCl3:Ce3+ monocrystal. The process is suitable for mass production of LaCl3:Ce3+ monocrystal.

Description

technical field [0001] The invention belongs to the technical field of single crystal growth. LaCl 3 : Ce 3+ Single crystal is a kind of scintillation crystal material discovered in recent years with excellent luminous properties. It has quite high luminous efficiency, high energy resolution, and short decay time, so it is considered by the material science community to be a scintillation crystal with great application value. , which is expected to be applied in the field of radiation detection technology mainly based on nuclear medical imaging. High-quality and large-size LaCl that meets practical needs can be grown by adopting the technology of the present invention 3 : Ce 3+ single crystal. Background technique [0002] In recent years, the rapid development of nuclear medical imaging technology has greatly promoted the research and development of inorganic scintillation crystals. The main performance requirements of medical scintillation crystals are: high luminous ...

Claims

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Application Information

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IPC IPC(8): C30B29/12C30B11/00
Inventor 陈红兵杨培志周昌勇蒋成勇
Owner NINGBO UNIV
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