Wetting Properties of Molten Iron Alloy at High-Pressure

9628220 Agee拟议的实验是为了确定熔融的铁合金在钙钛矿和镁闪锌矿固体基质中的润湿行为。这些实验将研究下地幔矿物对铁合金熔体渗流的影响。这一结果将对地球和行星核形成的模型产生重要的制约。将使用三种实验策略：(1)在多顶锤装置中，在Homestead L5球粒陨石中，在亚固相线高压条件下(~20 Gpa)平衡(Mg，Fe)SiO_3-钙钛矿、镁辉石和熔融的铁合金。通过测量晶体-晶体-液体界面的二面角来量化晶界润湿和合金熔体的连通性。(2)在16-20 Gpa的压力范围内，在亚固相线温度下平衡CaSiO_3-钙钛矿、镁闪锌矿和熔融铁合金的合成混合物。这些实验将提供对二面角测量和织构平衡的交叉检查。(3)对钙钛矿型镁辉石在无硫体系中的润湿角进行了实验研究。这些实验将为合金成分与润湿角行为之间的关系提供新的数据。

9628220 Agee The proposed experiments are to determine the wetting behavior of molten Fe-alloy in perovskite and magnesiowuestite solid matrices. These experiments will investigate the influence of lower mantle minerals on molten Fe-alloy percolation. Results will place important constraints on models of Earth and planetary core formation. Three experimental strategies will be used: (1) Equilibrate (Mg,Fe)SiO3-perovskite, magnesiowuestite, and molten Fe-alloy in a multi-anvil device at subsolidus, high-pressure conditions (~ 20 GPa), from Homestead L5 chondrite. Dihedral angles of crystal-crystal-liquid interfaces will be measure on quenched run products to quantify grain boundary wetting and alloy melt connectivity. (2) Equilibrate synthetic mixtures of CaSiO3-perovskite, magnesiowustite, and molten Fe-alloy at subsolidus temperatures in the pressure range 16-20 GPa. These experiments will provide a cross check on the dihedral angle measurements and textural equilibrium. (3) Experiments will be done to examine the wetting angle of perovskites + magnesiowuestite in a sulfur-free system. These experiments will offer new data on the relationship between alloy composition and wetting angle behavior.