Bridgman growth of LaCl₃:Ce³⁺ crystal in non-vacuum atmosphere

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• 作者：Hongbing Chen ; Peizhi Yang ; Changyong Zhou ; Chengyong Jiang
• 关键词：LaCl₃ ; Ce³⁺ ; Scintillator ; Anhydrous lanthanon chlorides ; Crystal growth ; Bridgman method
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 出版时间：31 January 2008
• 年：2008
• 卷：449
• 期：1-2
• 页码：172-175
• 全文大小：423 K

文摘

Growth of LaCl₃:Ce³⁺ crystal by the vertical Bridgman process in non-vacuum atmosphere has been studied. Based on the dehydration procedure of LaCl₃·7H₂O and CeCl₃·7H₂O investigated by DTA/TG, anhydrous LaCl₃ and CeCl₃ were prepared by heating LaCl₃·7H₂O and CeCl₃·7H₂O at 200–230 °C for 6–7 h in dried HCl atmosphere. Using the feed materials prepared from the anhydrous lanthanon chlorides, a 4 mol % Ce³⁺ doped LaCl₃ crystal with a size of Ø 28 mm × 70 mm was successfully grown. The crystal was grown under the optimum conditions such as a growth rate of 0.5–0.8 mm/h and a temperature gradient of around 30 °C/cm across solid–liquid interface at a furnace temperature of 940–960 °C. The Bridgman process is confirmed to be promising for growing large size LaCl₃:Ce³⁺ crystals with high quality.