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Growth and Scintillation Properties of TwoInch-Diameter SrI2(Eu) Single Crystals Yasuhiro Shoji, Shunsuke Kurosawa, YUUI YOKOTA, Shoki Hayasaka, Kei Kamada, Masao Yoshino, Akihiro Yamaji, Valery Chani, Yuji Ohashi, Shiro Sakuragi, and Akira Yoshikawa Cryst. Growth Des., Just Accepted Manuscript • DOI: 10.1021/acs.cgd.7b01044 • Publication Date (Web): 21 May 2018 Downloaded from http://pubs.acs.org on May 21, 2018

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is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Published by American Chemical Society. Copyright © American Chemical Society. However, no copyright claim is made to original U.S. Government works, or works produced by employees of any Commonwealth realm Crown government in the course of their duties.

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Crystal Growth & Design

List of Figures Fig. 1. View of the furnace (left) and schematic diagram of SrI2(Eu) single crystal growth(right) Fig. 2. Position of the thermocouple used for measuring the seeding temperature (left) and the position of the thermocouple to verify the variation of the growth rate along the boule (right). Fig. 3. The distribution of Eu2+ along the radial and growth directions. Fig. 4. View of the packaged SrI2(Eu) specimen (diameter = length = 2 in.) under normal (left) and ultraviolet light (right). Fig. 5. SrI2(Eu) crystal grown using the optimized conditions (left) and the corresponding temperature profile on the crucible bottom. Temperature measurements were performed using a thermocouple, as shown in Fig. 2 (left). Fig.6. The corresponding temperature profile on the crucible bottom, middle and top using a thermocouple, as shown in Fig. 2 (right). Fig.7. View of the 5mm cubic from the grown SrI2(Eu) (left), and impurity layer (middle) and raw material (right) for impurity analysis. Fig.8. Effect of the surface treatment of the 10 mm cubic SrI2(Eu) specimen on their pulse height spectra. Fig. 9. View of the packaged SrI2(Eu) specimen (diameter = length = 2 in.) under normal (left-top) and ultraviolet (left-bottom) light and the pulse height spectra of this specimen and Tl-doped NaI. Fig. 10. Scintillation decay curve of an SrI2(Eu) single crystal (diameter = length = 2 in.) Table.1. Analysis of impurities in each sample.

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Crystal Growth & Design 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

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RF coil

Carbon crucible

raw material

Seed Crystal growth Fig. 1. View of the furnace (left) and schematic diagram of SrI2(Eu) single crystal growth(right)


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K-thermo couple

Fig. 2. Position of the thermocouple used for measuring the seeding temperature (left) and the position of the thermocouple to verify the variation of the growth rate along the boule (right).



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wt (%) 0.500

RD-R

0.480

RD-C

0.460

RD-L

0.440 0.420 0.400 0.380

0.360 0.340 0.320 0.300 0

20

40

60

Length (mm)

Fig. 3. The distribution of Eu

2+

along the radial and growth directions.


80

100

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Fig. 4. View of the packaged SrI2(Eu) specimen (diameter = length = 2 in.) under normal (left) and ultraviolet light (right).



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bottom

Temp(℃)

Growth time (Min)

Fig. 5. SrI2(Eu) crystal grown using the optimized conditions (left) and the corresponding temperature profile on the crucible bottom. Temperature measurements were performed using a thermocouple, as shown in Fig. 2 (left).


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Temp(℃) 700 600 TC：Top

500

TC：Middle TC：Bottom

400

Start cooling 300 200 100 0

0

2000

4000

6000

8000

10000

12000

14000

16000

Growth time(min)

Fig.6. The corresponding temperature profile on the crucible bottom, middle and top using a thermocouple, as shown in Fig. 2 (right).



Fig.7. View of the 5mm cubic from the grown SrI2(Eu) (left), and impurity layer (middle) and raw material (right) for impurity analysis.


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A: Chemical Etching

B: Mirror polish

C: Polishing type X

Fig.8. Effect of the surface treatment of the 10 mm cubic SrI2(Eu) specimen on their pulse height spectra.



Fig.9. View of the pulse height spectra of packaged SrI2(Eu) specimen (diameter = length = 2 in.) and Tl-doped NaI.


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Fig. 10. Scintillation decay curve of an SrI2(Eu) single crystal (diameter = length = 2 in.)



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Table.1. Analysis of impurities in each sample. Samples Grown SrI2(Eu) Impurity layer Raw material

Elemental analysis (ppm) Ca Ba Ce

O

C

Na

Mg

0.526

0.0014

List of Figures

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