Measurements of vapor pressure of Y and activity of Y in Y–O alloy by multi-Knudsen cell mass spectrometry

Measurements of Vapor Pressures of Sc, La, and Ce by Multi-Knudsen Cell Mass Spectrometry

“…As shown in Figure 3, the resultant vapor pressures of Y agreed well with the result of our previous study, [7] Similarly, the vapor pressure of Sc was calculated using Cu as the reference. Figure 3 shows the resultant vapor pressure of Sc.…”

“…Recently, we demonstrated that the vapor pressure of yttrium (Y) could be accurately measured by multi-Knudsen cell mass spectrometry. [7] In this method, measurements are carried out in a high vacuum in a short time, and thus, significant oxidation or contamination of the RE metal during the measurements can be avoided. [7] In the present study, vapor pressures of Sc at temperatures from 1373 K to 1573 K and those of La and Ce from 1473 K to 1573 K were determined in a similar way.…”

“…[7] In this method, measurements are carried out in a high vacuum in a short time, and thus, significant oxidation or contamination of the RE metal during the measurements can be avoided. [7] In the present study, vapor pressures of Sc at temperatures from 1373 K to 1573 K and those of La and Ce from 1473 K to 1573 K were determined in a similar way. The Gibbs energies of formation of gaseous elements were derived from the vapor pressures.…”

Thermodynamic measurement of La–Fe and Y–Fe alloys by multi-Knudsen cell mass spectrometry

“…Using Knudsen mass spectrometry, the authors were successful in measuring the vapor pressure of RE metals and those in the alloys [15,16]. In this study, the activities of La and Fe in the La-Fe system, and that of Y and Fe in the Y-Fe system were determined by multi-Knudsen mass spectrometry.…”

Thermodynamic Measurements of Alloys and Compounds by Double Knudsen Cell Mass Spectrometry and Their Application to Materials Processing

“…We have, in past studies, applied the technique to various systems, including ironzinc 33) and rare earth alloys. 37,40,42,44,45) For example, activity measurements on copper-nickel (Cu-Ni) alloys are demonstrated here. Cu and Ni show a complete solid solubility at high temperatures as shown by the phase diagram 48) in Fig.…”