2003 Fiscal Year Final Research Report Summary
Partial molar volume of FeO, NiG and CoO liquid at high pressure
| Project/Area Number |
13440163
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
URAKAWA Satoru Okayama University, Dept. Earth Sci., Associate Professor, 理学部, 助教授 (30201958)
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| Co-Investigator(Kenkyū-buntansha) |
KATSURA Tomoo Okayama University, ISEI, Associate Professor, 個体地球研究センター, 助教授 (40260666)
KATAYAMA Yoshinori Japan Atom. Energy Res. Inst., SRC, Senior Researcher, 関西研究所, 主任研究員 (20224462)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Silicate melt / density / high pressure / synchrotron radiation / X-ray absorption |
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| Research Abstract |
We have developed the high-pressure X-ray absorption technique to measure density of silicate melts at high-pressure using synchrotron X-ray and a multi-anvil apparatus, in order to determine partial molar volume of siderophile oxide liquid at high pressure. Density (ρ) is evaluated from X-ray absorption profile of a sample using the equation of I=I_0 exp(-ρμt), where land are intensities of transmitted and incident X-rays, respectively, μ is mass absorption coefficient of sample, and t is sample thickness. In this study, we used a single crystalline diamond cylinder as a sample capsule, because its low X-ray absorption, hardness, and inertness with silicate melts. Diamond capsule makes the densiy measurement of silciate metls under pressure possible.
High-pressure X-ray absorption experiments were conducted by using a DIA-type cubic anvil apparatus and a highly brilliant monochromatic X-ray at BL22XU of SPring-8,Japan. We used glasses with the compositions both of the MORB and of the Fe-bearing sodium disilicate for starting materials. Although densities of glasses, crystalline solids, and melts were determined up to 5 GPa and 1873 K, we have not determined the partial molar volume of liquid. This method can, however, yield a series of density data at high pressures and temperatures within an error of 1% enough to evaluate the partial molar volume of silicate liquid.
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