2018 Fiscal Year Final Research Report
Cathodoluminescence measurements of several minerals under a sample-temperature control and its application
| Project/Area Number |
16K05614
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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 |
Petrology/Mineralogy/Economic geology
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| Research Institution | Okayama University of Science |
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Principal Investigator |
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| Research Collaborator |
Kusano Nobuhiro
Ohgo Shuhei
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | カソードルミネッセンス / 発光中心 / 温度消光 / 温度増感 / 発光メカニズム / 鉱物 |
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| Outline of Final Research Achievements |
Cathodoluminescence (CL) characterization of several minerals including carbonates and hydrous silicates has been conducted to clarify unusual effects of sample temperature on their CL emissions. The luminescent efficiencies at individual temperatures were quantitatively estimated from the Arrhenius plots indicating temperature quenching and/or sensitizing processes, which can be explained on the basis of Mott-Seitz and Barnett-Bailiff models. In general, luminescence efficiency decreases with rising temperature due to an increase in non-radiative transitions. However, this study reveals that a variety of CL quenching and sensitizing mechanisms in the minerals should be closely related to characteristic features of emission centers and energy transfers between the centers.
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| Free Research Field |
鉱物科学
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| Academic Significance and Societal Importance of the Research Achievements |
物質に電子線を照射した際に発現するルミネッセンス（CL）を温度変化させ測定し、各種鉱物に内在する発光要因（発光中心）と発光メカニズムを明らかにしてきた。従来からこの分野の探究はほとんどなく、CLを用いた鉱物の結晶化学的研究に新たな方法を提示でき、鉱物のCLを指標とする地質温度計、地質圧力計および地質線量計への応用が期待できる。これにより、新たな資源探査や放射線被ばく線量の推定などへの実用も可能かもしれない。
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