Magnetic Properties of the LaNi5-H System
Author(s)
Blach, TP
Gray, EM
Griffith University Author(s)
Year published
1997
Metadata
Show full item recordAbstract
We simultaneously measured the H/M atomic ratio and the magnetization, M, of LaNi5–H while it was activated and then cycled many times, at 100 °C and then 26 °C. The overall magnetization of the sample rose steadily as cycling precipitated Ni. In addition, however, M exhibits a large degree of magnetic hysteresis between the absorption and desorption isotherms. The magnetization in both the pure α and β phases is very sensitive to the H concentration. Furthermore, we found that the intrusion of the intermediate γ phase, LaNi5H≈3, also profoundly altered the magnetic properties of the sample. It is proposed that the ferromagnetism ...
View more >We simultaneously measured the H/M atomic ratio and the magnetization, M, of LaNi5–H while it was activated and then cycled many times, at 100 °C and then 26 °C. The overall magnetization of the sample rose steadily as cycling precipitated Ni. In addition, however, M exhibits a large degree of magnetic hysteresis between the absorption and desorption isotherms. The magnetization in both the pure α and β phases is very sensitive to the H concentration. Furthermore, we found that the intrusion of the intermediate γ phase, LaNi5H≈3, also profoundly altered the magnetic properties of the sample. It is proposed that the ferromagnetism occurs by exchange between clusters of fcc Ni spins, via polarization of the conduction electrons.
View less >
View more >We simultaneously measured the H/M atomic ratio and the magnetization, M, of LaNi5–H while it was activated and then cycled many times, at 100 °C and then 26 °C. The overall magnetization of the sample rose steadily as cycling precipitated Ni. In addition, however, M exhibits a large degree of magnetic hysteresis between the absorption and desorption isotherms. The magnetization in both the pure α and β phases is very sensitive to the H concentration. Furthermore, we found that the intrusion of the intermediate γ phase, LaNi5H≈3, also profoundly altered the magnetic properties of the sample. It is proposed that the ferromagnetism occurs by exchange between clusters of fcc Ni spins, via polarization of the conduction electrons.
View less >
Journal Title
Journal of Alloys and Compounds
Volume
253-254
Subject
Condensed matter physics
Materials engineering
Resources engineering and extractive metallurgy