Growth of LaBr3:Ce3+ Single Crystal by Vertical Bridgman Process in Nonvacuum Atmosphere

J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (06): 753-757.

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Growth of LaBr₃:Ce³⁺ Single Crystal by Vertical Bridgman Process in Nonvacuum Atmosphere

Hongbing Chen¹⁾, Changyong Zhou¹⁾, Peizhi Yang²⁾, Jinhao Wang¹⁾

1) State Key Laboratory Base of Novel Functional Materials & Preparation Science, Institute of Materials Science & Engineering, Ningbo University, Ningbo 315211, China
2) Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials, Ministry of Education, Yunnan Normal University, Kunming 650092, China

Received:2008-06-12 Revised:2009-03-02 Online:2009-11-28 Published:2009-11-24
Contact: Hongbing Chen
Supported by:
the Scientific & Technical Project of Zhejiang Province, China (No. 2005C31029)
the Doctor Science Foundation of Ningbo City, China (No. 2005A610021).

Abstract

Abstract:

The growth of LaBr₃:Ce³⁺ crystal by the vertical Bridgman process in a nonvacuum atmosphere was reported. According to the dehydration procedure of LaBr₃·7H₂O and CeBr₃·7H₂O investigated by differential thermal analysis/thermogravimetry (DTA/TG), anhydrous LaBr₃ and CeBr₃were prepared by heating LaBr₃·7H₂O and CeBr₃·7H₂O at 240-260°C for 5-6 h in dried HBr atmosphere. Using the feed materials prepared from the anhydrous lanthanon bromides, a 0.5 mole fraction Ce³⁺ doped LaBr₃ crystal with size of Φ25 mm×50 mm had been grown by vertical Bridgman process successfully. By sealing the feed material in a platinum crucible, the crystal could be grown in a nonvacuum atmosphere as the oxidization and volatilization of the melt could be avoided. The crystal was grown with the optimum conditions such as a growth rate of 0.5-1.0 mm/h and a temperature gradient of around 30°C/cm across solid-liquid interface under a furnace temperature of 850-880°C. The crystal was characterized by DTA/TG, X-ray diffraction (XRD), optical transmission, photoluminescence and X-ray stimulated luminescence measurement. The Bridgman process was confirmed to be promising for growing transparent LaBr₃:Ce³⁺ crystal with high optical quality.

Key words: LaBr₃∶Ce³⁺, Scintillator, Dehydration, Crystal growth, Bridgman process

Hongbing Chen,Changyong Zhou,Peizhi Yang,Jinhao Wang. Growth of LaBr₃:Ce³⁺ Single Crystal by Vertical Bridgman Process in Nonvacuum Atmosphere[J]. J Mater Sci Technol, 2009, 25(06): 753-757.

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Growth of LaBr₃:Ce³⁺ Single Crystal by Vertical Bridgman Process in Nonvacuum Atmosphere

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