Hydrogenation and Anisotropic Expansions in R3Fe29-xTx  (R = Y, Ce, Nd, Sm, Gd, Tb and Dy; T=V and Cr)

Abstract

Abstract: A systematic study of the phase formation, structure and magnetic properties of the R3Fe29-xTx compounds (R = Y, Ce, Nd, Sm, Gd, Tb, and Dy; T = V and Cr) has been performed upon hydrogenation. The lattice constants and the unit cell volume of R3Fe29-xTxHy decrease with increasing R atomic number from Nd to Dy, except for Ce, reflecting the lanthanide contraction. Regular anisotropic expansions mainly along the a- and b-axis rather than along the c-axis are observed for all of the compounds upon hydrogenation. Hydrogenation leads to an increase in the Curie temperature and a corresponding increase in the saturation magnetization at room temperature for each compound. First order magnetization processes (FOMP) occur in the external magnetic fields for Nd3Fe24.5Cr4.5H5.0, Tb3Fe27.0Cr2.0H2.8, and Gd3Fe28.0Cr1.0H4.2 compounds.

Key words:

Xiufeng HAN, Lanying LIN, T.Miyazaki, Fuming YANG, Rengeng XU, Xinhua WANG, Hongge PAN, Changping CHEN. Hydrogenation and Anisotropic Expansions in R3Fe29-xTx (R = Y, Ce, Nd, Sm, Gd, Tb and Dy; T=V and Cr)[J]. J Mater Sci Technol, 1999, 15(01): 5-9.

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Hydrogenation and Anisotropic Expansions in R3Fe29-xTx (R = Y, Ce, Nd, Sm, Gd, Tb and Dy; T=V and Cr)

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