| Project/Area Number |
02650555
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学・無機材料工学
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| Research Institution | Shinshu University |
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Principal Investigator |
OISHI Shuji Shinshu University, Faculty of Engineering, Assistant Professor, 工学部, 助教授 (50021027)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Radiation detector / Single crystal / Oxide crystal / Gadolinium silicate / Flux growth / Potassium fluoride / Sodium Fluoride / Gadolinium sodium silicate / ケイ酸ガドリニウムナトリウム |
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| Research Abstract |
Crystals of Gd_2SiO_5 have been known to play host to the cerium activator. The growth of Gd_2SiO_5 crystals from MF(M=Li, Na, and K)fluxes was attempted by a slow cooling method.
1. Gadolinium silicate crystals were grown from KF flux. The well-formed Gd_2SiO_5 crystals of good quality were colorless and transparent. The density determined pycnometrically was 6.69<plus-minus>0.03 g/cm^3. The crystals up to 0.7 mm in size were grown from the mixture containing 5 mol% solute. The crystal size decreased with increasing the solute content. Potassium fluoride was the most suitable flux to grow Gd_2SiO_5 crystals. The large batches produced the large crystals of Gd_2SiO_5.
2. Gadolinium silicate crystals up to 0.4 mm in size were grown from LiF flux. The small Gd_2SiO_5 crystals were well-formed. The large Gd_2SiO_5 crystals were not well-formed. Lithium fluoride flux also crystallized as a cubic form. The LiF crystals were up to 3.8 mm in size. Lithium fluoride was inferior to KF flux to grow Gd_2SiO_5 crystals.
3. Gadolinium silicate crystals were not grown from NaF flux. Unwanted NaGdSiO_4 crystals up to 6.0 mm in size were grown from NaF flux. The well-formed NaGdSiO_4 crystals of good quality were colorless and transparent. The reaction of solute with flux afforded the unwanted compound. Sodium fluoride was not suitable flux to grow Gd_2SiO_5 Crystals.
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