Partial molar volume of FeO, NiG and CoO liquid at high pressure

高压下 Fe3O、NiG 和 CoO 液体的偏摩尔体积

• 批准号: 13440163
• 负责人: URAKAWA Satoru
• 金额: $ 3.07万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440163/
• 关键词: Silicate melt; density; high pressure; synchrotron radiation; X-ray absorption; 親鉄元素; 部分モル体積; 元素分配; 核形成過程

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.

为了测定高压下亲铁氧化物液体的偏摩尔体积，我们发展了高压X射线吸收技术，利用同步辐射X射线和多砧装置测量高压下硅酸盐熔体的密度。密度（ρ）由样品的X射线吸收曲线用公式I= I_0exp（-ρμt）计算，其中I_0分别为透射和入射X射线的强度，μ为样品的质量吸收系数，t为样品厚度。在这项研究中，我们使用单晶金刚石圆柱作为样品胶囊，因为它的低X射线吸收，硬度和惰性与硅酸盐熔体。金刚石膜盒使高压下测量硅酸盐金属的密度成为可能。在日本SPring-8的BL 22 XU实验室，用DIA型六面顶砧装置和高亮度单色X射线进行了高压X射线吸收实验。我们使用具有MORB和含铁二硅酸钠的组合物的玻璃作为起始材料。虽然密度的玻璃，结晶固体，熔体测定高达5 GPa和1873 K，我们还没有确定液体的偏摩尔体积。然而，这种方法可以在高压和高温下产生一系列密度数据，误差在1%以内，足以评估硅酸盐液体的偏摩尔体积。

项目成果

In situ density measurement of basaltic glass at high pressure

高压下玄武岩玻璃的原位密度测量

• 发表时间: 2003
• 期刊: Geochimica et Cosmochimica Acta Special Supplemen
• 作者: S.Urakawa;R.Ando;B.Ohtani;Y.Katayama;R.Ando et al.
• 通讯作者: R.Ando et al.

A.Kubo, T.Katsura, et al.: "In situ X-ray observation of iron using Kawai-type apparatus equipped with sintered diamond : absence of beta phase up to 44 GPa and 2100K"Geophysical Research Letters. 30. 0.1029/2002GL016394 (2003)

A.Kubo、T.Katsura 等人：“使用配备烧结金刚石的 Kawai 型装置对铁进行原位 X 射线观察：高达 44 GPa 和 2100K 时不存在 β 相”地球物理研究快报。

S.Urakawa et al.: "High-pressure phase relationships of FeS"High Pressure Research. 22. 491-494 (2002)

S.Urakawa 等人：“FeS 的高压相关系”高压研究。

S.Urakawa: "Radiographic study on the viscosity of the Fe-FeS melts at the pressure of 5 to 7 GPa"American Mineralogist. 86. 578-582 (2001)

S.Urakawa：“在 5 至 7 GPa 压力下对 Fe-FeS 熔体粘度的射线照相研究”美国矿物学家。

H.Terasaki: "The effect of temperature, pressure, and sulfur content on viscosity of the Fe-FeS melt"Earth and Planetary Science Letters. 190. 93-101 (2001)

H.Terasaki：“温度、压力和硫含量对 Fe-FeS 熔体粘度的影响”地球与行星科学快报。