Abstract
We study the impact of hydrogen impurity on the magnetic phase transition temperatures of the high purity rare-earth metals Gd, Tb and Dy. Prior to hydrogenation, the rare earths were purified by the vacuum distillation method. Hydrogenation was carried out using a Sievert-type apparatus. Magnetic phase diagrams were constructed based on the thermomagnetic analysis.
Highlights
Characterization of physicochemical properties of the rare earth (R) metals should be performed on purified [1] samples due to their high chemical activity and strong affinity for gas-forming impurities
A systematic study of the hydrogenation effect on magnetic properties of a distilled gadolinium, terbium and dysprosium is carried out. (The interest to Gd is due to its high magnetocaloric properties near room temperature that allow its use as a working body in magnetic refrigerators [8,9,10].) R’s interaction with hydrogen is rather extensively studied
The variations in the R phase transition temperatures ranging between 1 and 5 degrees were recorded previously [28,29,30], they cannot be attributed to a particular impurity but rather to a mixture of impurities absorbed by a metal
Summary
Characterization of physicochemical properties of the rare earth (R) metals should be performed on purified [1] samples due to their high chemical activity and strong affinity for gas-forming impurities. (The interest to Gd is due to its high magnetocaloric properties near room temperature that allow its use as a working body in magnetic refrigerators [8,9,10].) R’s interaction with hydrogen is rather extensively studied.
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