Densities of Pt-X (X: Fe, Co, Ni and Cu) binary melts and thermodynamic correlations
Densities of Pt-X (X: Fe, Co, Ni and Cu) binary melts and thermodynamic correlations
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DOI：
10.1016/j.fluid.2020.112596
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发表时间：
2020-07-01
影响因子：
2.6
通讯作者：
Fukuyama, Hiroyuki
中科院分区：
文献类型：
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作者：
Watanabe, Manabu;Adachi, Masayoshi;Fukuyama, Hiroyuki
采用静磁场电磁悬浮技术，在包括过冷液相区在内的较宽温度范围内，测量了液态二元铂X(X：Fe，Co，Ni和Cu)合金的密度。静磁场有效地抑制了悬浮的铂-X样品液滴的平移运动和表面振荡，使高精度的非接触密度测量成为可能。通过密度测量估算了液态合金的过剩摩尔体积(V-E)，证明了液态铂-X体系具有正的V-E和负的过剩摩尔吉布斯能(G(E))。铂-X体系具有一个共同的特征，即相图中存在有序-无序相变。还应注意的是，随着X的3d轨道上电子数目的增加，V-E减小，G(E)增加。讨论了液态铂-X系统中的这一独特特征，并讨论了铂与X合金化可能引起的电子结构重排。(C)2020。爱思唯尔出版公司(Elsevier B.V.)
The densities of liquid binary Pt-X (X: Fe, Co, Ni and Cu) alloys were measured over a wide temperature range including the supercooled liquid region, using electromagnetic levitation under a static magnetic field. The static magnetic field effectively suppressed translational motion and surface oscillation of the levitated Pt-X sample droplets, enabling high-accuracy density measurement in a non-contact manner. The excess molar volumes (V-E) of the liquid alloys were evaluated from the density measurements, and we demonstrated that the liquid Pt-X systems have positive V-E with negative excess molar Gibbs energy (G(E)). The Pt-X systems have the common feature that order-disorder transitions are present in their phase diagrams. It should be also noted that V-E decreases and G(E) increases with increasing number of electrons in the 3d orbital of X. This unique feature in the liquid Pt-X systems was discussed with possible rearrangement of electronic structure caused by alloying Pt with X. (C) 2020 The Authors. Published by Elsevier B.V.