| Project/Area Number |
26420686
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
LI JIGUANG 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主幹研究員 (90354381)
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| Co-Investigator(Renkei-kenkyūsha) |
SAKKA Yoshio 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, NIMS招聘研究員 (00354217)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 球形微粒子 / 焼結 / 透明セラミック材料 / 光物性 / 透明セラミックス材料 / 均一沈澱 / 塩基性炭酸塩 / 酸化物 / 蛍光特性 / エネルギー移転 |
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| Outline of Final Research Achievements |
Basic carbonate monosheres with the average diameter well controlled in the wide range of 110-590 nm were successfully synthesized via homogeneous precipitation for the Y/Gd/Tb ternary system. (Y0.95-xGdxTb0.05)2O3 ceramics with in-line transmittances reaching 80% were then fabricated via vacuum sintering at 1700 deg C of the well-dispersed oxide particles calcined from such monosheres. Colloidal processing produces denser green bodies of higher microstructure uniformity than CIP. The optimal Gd content was determined to be 2 at% for the 545 nm green-emission of Tb3+. Besides, with layered hydroxide nanosheets as a new type of precursor, single-crystal like transparent ceramics (transmittance: 80-83%) were also fabricated via vacuum sintering at 1700 degC. It was found that a lower heating rate of vacuum sintering produces ceramics of higher transparency. Tb3+ emission improves with increasing crystallite or particle size, and has the fluorescence lifetime of about 1.5-2.8 ms.
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