TY - JOUR
T1 - Czochralski growth of 2 in. Ce-doped (La,Gd)2Si2O7 for scintillator application
AU - Yoshikawa, Akira
AU - Shoji, Yasuhiro
AU - Kurosawa, Shunsuke
AU - Chani, Valery I.
AU - Murakami, Rikito
AU - Horiai, Takahiko
AU - Kamada, Kei
AU - Yokota, Yuui
AU - Ohashi, Yuji
AU - Kochurikhin, Vladimir
N1 - Funding Information:
This work was partially supported by (i) Adaptable & Seamless Technology Transfer Program through Target-driven R&D (A-STEP), JST , (ii) Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Exploratory Research (AY) and Grant-in-Aid for Young Scientists (B) (S.K, Grant number 15619740 ), (iii) Development of Systems and Technology for Advanced Measurement and Analysis, Japan Science and Technology Agency (JST) , and (iv) the funding program for next generation world-leading researchers, JSPS . In addition, authors would like to thank following persons for their support: Mr. Hiroshi Uemura, Ms. Keiko Toguchi, Ms. Megumi Sasaki, and Ms. Yuka Takeda of IMR. Authors also thank Mr. Sugawara, Ms. Nomura at Cryst. Growth & Design, Cooperative Research and Development Center for Advanced Materials, IMR, Tohoku University.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/10/15
Y1 - 2016/10/15
N2 - Growth of 2-in. diameter Ce-doped (La,Gd)2Si2O7 (La-GPS) scintillating crystals by Czochralski method using Ir crucible is reported. The composition of the host material was approximately equal to La0.5Gd1.5Si2O7 and the concentration of the Ce3+-activator was either 0.5 or 1.5 at.% with respect to the total content of the rare-earths forming the host crystal matrix. Effects of the hot zone construction including inductive coil position, presence/absence of the after-heater, rotation rate and other growth parameters on the crystal quality are discussed in some details. The crystals produced in optimized conditions were colorless, transparent, uniform in their shape, crack- and inclusions-free, and demonstrated smooth glass-like surface. The length of the crystals’ cylindrically-shaped body parts exceed 100 mm. The growth results were well reproducible. The main disadvantage of the growth process is associated with short lifetime of the Ir crucible and its deformation caused by thermal expansion of the pre-solidified melt at each heating stage.
AB - Growth of 2-in. diameter Ce-doped (La,Gd)2Si2O7 (La-GPS) scintillating crystals by Czochralski method using Ir crucible is reported. The composition of the host material was approximately equal to La0.5Gd1.5Si2O7 and the concentration of the Ce3+-activator was either 0.5 or 1.5 at.% with respect to the total content of the rare-earths forming the host crystal matrix. Effects of the hot zone construction including inductive coil position, presence/absence of the after-heater, rotation rate and other growth parameters on the crystal quality are discussed in some details. The crystals produced in optimized conditions were colorless, transparent, uniform in their shape, crack- and inclusions-free, and demonstrated smooth glass-like surface. The length of the crystals’ cylindrically-shaped body parts exceed 100 mm. The growth results were well reproducible. The main disadvantage of the growth process is associated with short lifetime of the Ir crucible and its deformation caused by thermal expansion of the pre-solidified melt at each heating stage.
KW - A1. Solid solutions
KW - A2. Czochralski method
KW - A2. Growth from melt
KW - B2. Scintillator materials
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U2 - 10.1016/j.jcrysgro.2016.06.016
DO - 10.1016/j.jcrysgro.2016.06.016
M3 - Article
AN - SCOPUS:84992111242
SN - 0022-0248
VL - 452
SP - 57
EP - 64
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -