TY - JOUR
T1 - Improvement of dopant distribution in radial direction of single crystals grown by micro-pulling-down method
AU - Yokota, Yuui
AU - Kudo, Tetsuo
AU - Chani, Valery
AU - Ohashi, Yuji
AU - Kurosawa, Shunsuke
AU - Kamada, Kei
AU - Zeng, Zhong
AU - Kawazoe, Yoshiyuki
AU - Yoshikawa, Akira
N1 - Funding Information:
This work was partially supported by the New Energy and Industrial Technology Development Organization (NEDO), Ministry of Education, Culture, Sports, Science and Technology of Japanese government, Grant-in-Aid for Young Scientists, Development of Systems and Technology for Advanced Measurement and Analysis, Japan Science and Technology Agency (JST) and Adaptable & Seamless Technology Transfer Program through Target-driven R&D [A-STEP] (JST). In addition, we appreciate the support by Mr. Issei Narita for the measurements of EPMA. The authors would like to express their sincere thanks to the crew of Center for Computational Materials Science of the Institute for Materials Research, Tohoku University for their continuous support of the SR16000 supercomputing facilities.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/9/15
Y1 - 2017/9/15
N2 - Two iridium crucibles with one and five capillaries at a nozzle were developed for the growth of Ce-doped Y3Al5O12 [Ce:YAG] single crystals by the micro-pulling-down [μ-PD] method. The purpose of the study was to examine the effect of the capillary number on the Ce distribution in the radial direction of the crystals. The crystals grown from 2 mol% and 5 mol% Ce-doped YAG melts were then cut perpendicular to the growth direction and polished to produce specimens suitable for the measurement of Ce distribution. The Ce:YAG crystals grown using the crucible with one capillary [Ce:YAG(1 C)] had greater Ce content in the central portion of the crystal when compared to its peripheral parts. On the other hand, in the case of the Ce:YAG crystal grown using the crucible with five capillaries [Ce:YAG(5 C)], the increased Ce concentration was detected in five specimen sections positioned just below the capillaries. The results indicated that increase of the number of capillaries is effective practice that results in an improvement of the radial homogeneity of the single crystals grown by the μ-PD method.
AB - Two iridium crucibles with one and five capillaries at a nozzle were developed for the growth of Ce-doped Y3Al5O12 [Ce:YAG] single crystals by the micro-pulling-down [μ-PD] method. The purpose of the study was to examine the effect of the capillary number on the Ce distribution in the radial direction of the crystals. The crystals grown from 2 mol% and 5 mol% Ce-doped YAG melts were then cut perpendicular to the growth direction and polished to produce specimens suitable for the measurement of Ce distribution. The Ce:YAG crystals grown using the crucible with one capillary [Ce:YAG(1 C)] had greater Ce content in the central portion of the crystal when compared to its peripheral parts. On the other hand, in the case of the Ce:YAG crystal grown using the crucible with five capillaries [Ce:YAG(5 C)], the increased Ce concentration was detected in five specimen sections positioned just below the capillaries. The results indicated that increase of the number of capillaries is effective practice that results in an improvement of the radial homogeneity of the single crystals grown by the μ-PD method.
KW - A1. Segregation
KW - A2. Growth from melt
KW - A2. Single crystal growth
KW - B1. Oxides
KW - B3. Scintillators
KW - B3. Solid state lasers
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U2 - 10.1016/j.jcrysgro.2016.11.119
DO - 10.1016/j.jcrysgro.2016.11.119
M3 - Article
AN - SCOPUS:85007524550
SN - 0022-0248
VL - 474
SP - 178
EP - 182
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
ER -