Time Dependence of the Growth Morphology of GaN Single Crystals Prepared in a Na–Ga Melt
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概要
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The yields of GaN prepared in a Na–Ga melt at 700–800°C and 1–5 MPa of N2 for 200 h were measured. The morphology of the GaN crystals changed from pyramidal (yields 6–13%) to prismatic (yields 19–100%), and finally to thin platelets (yields 61–100%) with increasing temperature and N2 pressure. A time dependence of the morphology was observed for the sample prepared at 750°C and 5 MPa of N2. The morphology changed from pyramidal, prismatic to thick platelets with heating times up to 50 h. The yield of GaN increased linearly during this period. The formation rate of GaN increased after 50 h, and the crystal growth perpendicular to the $c$ axis was enhanced. The crystal growth was completed within 200 h, and thin platelet single crystals with a size of 1–2 mm were formed. Microphotoluminescence spectra were measured at the cross section of a thin platelet GaN crystal. A large broad luminescence peak at 3.26 eV, probably associated with Mg or Si acceptors, was observed in the spectra obtained from the regions near the (0001) Ga polar plane.
- 2005-05-15
著者
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SHIMADA Masahiko
Akita National College of Technology
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GOTO Takenari
Center for Interdisciplinary Research, Tohoku University
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SARAYAMA Seiji
Department 1, R & D Center, Research and Development Group, Ricoh Company, Ltd.
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Iwata Hirokazu
Department 1 R & D Center Research And Development Group Ricoh Company Ltd.
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Yao Takafumi
Center For Interdisciplinary Research Tohoku University
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Goto Hiroki
Institute For Materials Research Tohoku University
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Makino Hisao
Institute For Material Research Tohoku University
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Disalvo Francis
Department Of Chemistry And Chemical Biology Cornell University
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Aoki Masato
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University
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Yamada Takahiro
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University
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Yamane Hisanori
Center For Advanced Nitride Technology (cantech) Institute Of Multidisciplinary Research For Advance
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Makino Hisao
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Goto Hiroki
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Yao Takafumi
Center for Interdisciplinary Research, Tohoku University, 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Yamada Takahiro
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Yamane Hisanori
Center for Interdisciplinary Research, Tohoku University, 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Shimada Masahiko
Akita National College of Technology, Bunkyo-cho, Iijima, Akita 011-8511, Japan
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YAMADA Takahiro
Institute of Multidisciplinary for Advanced Materials, Tohoku University
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