Cs2HfCl6 (CHC) is a promising high density, high-Z, non-hygroscopic, and high energy resolution scintillator. In CHC, many crystals have CsCl inclusions that form during growth. In this paper, we investigate how material synthesis, growth rate, and thermal gradient affect the formation of CsCl inclusions and their effect on scintillation performance. First, precursor material was made through a methanol synthesis process both with and without hydrochlorination. Next, five crystals were grown using Bridgman method, at growth rates of 1 or 0.5 mm/h, and thermal gradients of 21 degrees C or 34 degrees C per millimeter. The best overall performance was observed in a 22 mm diameter crystal produced using hydrochlorination which was grown at 1 mm/h in a thermal gradient of 34 degrees C per millimeter. It had a light yield of 36,000 photons/MeV and an energy resolution of 4.0% at 662 keV. We have also shown that poorer scintillation performance in the lower quality crystals is most likely due to reduced light collection caused by a higher concentration of inclusions.
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South China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt F, Sch Mat Sci & Engn, State Key Lab Luminescent Mat & Devices,Guangdong, Guangzhou 510641, Peoples R ChinaSouth China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt F, Sch Mat Sci & Engn, State Key Lab Luminescent Mat & Devices,Guangdong, Guangzhou 510641, Peoples R China
Liao, Wei
Han, Kai
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South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510641, Peoples R ChinaSouth China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt F, Sch Mat Sci & Engn, State Key Lab Luminescent Mat & Devices,Guangdong, Guangzhou 510641, Peoples R China
Han, Kai
Wang, Yuzhen
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South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510641, Peoples R ChinaSouth China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt F, Sch Mat Sci & Engn, State Key Lab Luminescent Mat & Devices,Guangdong, Guangzhou 510641, Peoples R China
Wang, Yuzhen
Xia, Zhiguo
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South China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt F, Sch Mat Sci & Engn, State Key Lab Luminescent Mat & Devices,Guangdong, Guangzhou 510641, Peoples R China
South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510641, Peoples R ChinaSouth China Univ Technol, Guangdong Engn Technol Res & Dev Ctr Special Opt F, Sch Mat Sci & Engn, State Key Lab Luminescent Mat & Devices,Guangdong, Guangzhou 510641, Peoples R China