TY - JOUR
T1 - Densities of Pt–X (X
T2 - Fe, Co, Ni and Cu) binary melts and thermodynamic correlations
AU - Watanabe, Manabu
AU - Adachi, Masayoshi
AU - Uchikoshi, Masahito
AU - Fukuyama, Hiroyuki
N1 - Funding Information:
This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number 26249113 and 18J11474 .
PY - 2020/7/1
Y1 - 2020/7/1
N2 - 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 (VE) of the liquid alloys were evaluated from the density measurements, and we demonstrated that the liquid Pt–X systems have positive VE with negative excess molar Gibbs energy (GE). The Pt–X systems have the common feature that order–disorder transitions are present in their phase diagrams. It should be also noted that VE decreases and GE 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.
AB - 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 (VE) of the liquid alloys were evaluated from the density measurements, and we demonstrated that the liquid Pt–X systems have positive VE with negative excess molar Gibbs energy (GE). The Pt–X systems have the common feature that order–disorder transitions are present in their phase diagrams. It should be also noted that VE decreases and GE 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.
KW - Density
KW - Electromagnetic levitation
KW - Enthalpy of mixing
KW - Excess gibbs energy
KW - Excess volume
KW - Liquid binary alloy
UR - http://www.scopus.com/inward/record.url?scp=85083339889&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083339889&partnerID=8YFLogxK
U2 - 10.1016/j.fluid.2020.112596
DO - 10.1016/j.fluid.2020.112596
M3 - Article
AN - SCOPUS:85083339889
VL - 515
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
SN - 0378-3812
M1 - 112596
ER -