Crystallographic and magnetic properties of hydride R3Fe29-xTxHy (R=Y, Ce, Nd, Sm, Gd, Tb and Dy; T=V and Cr)

The crystallographic and intrinsic magnetic properties of hydride R3Fe29-xTxHy (R=Y, Ce, Nd, Sm, Gd, Tb, and Dy; T=V and Cr) have been investigated. 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 the compounds upon hydrogenation. Hydrogenation leads to an increase in Curie temperature. First-order magnetization processes (FOMP) occur in magnetic fields of around 1.5 T and 4.0 T at 4.2 K for Nd3Fe24.5Cr4.5H5.0 and Tb(3)Fc(27.0)Cr(2.0)H(2.8), and around 1.4 T at room temperature for Gd3Fe28.0Cr1.0H4.2 Abnormal crystallographic and magnetic properties of Ce3Fe29-xTxHy suggest that the Ce ion is non-triply ionized.

The crystallographic and intrinsic magnetic properties of hydride R3Fe29-xTxHy (R=Y, Ce, Nd, Sm, Gd, Tb, and Dy; T=V and Cr) have been investigated. 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 the compounds upon hydrogenation. Hydrogenation leads to an increase in Curie temperature. First-order magnetization processes (FOMP) occur in magnetic fields of around 1.5 T and 4.0 T at 4.2 K for Nd3Fe24.5Cr4.5H5.0 and Tb(3)Fc(27.0)Cr(2.0)H(2.8), and around 1.4 T at room temperature for Gd3Fe28.0Cr1.0H4.2 Abnormal crystallographic and magnetic properties of Ce3Fe29-xTxHy suggest that the Ce ion is non-triply ionized.

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Fundacao Amparo Pesquisa Estado Sao Paulo.; Conselho Nacl Desenvolvimento Cient & Tecnologico.; Coordenadoria Aperfeicoamento Pessoal Nivel Super.; Universidad Sao Paulo, Pro Reitoria Pesquisa.; Centro Latino Americano Fis.; Int Ctr Theoret Phys.; Int Union Crystallog.; CGA Analit.

Chinese Acad Sci, Inst Semicond, Ctr Mat Sci, Beijing 100083, Peoples R China; Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil; Zhejiang Univ, Dept Mat, Hangzhou 310027, Peoples R China

Fundacao Amparo Pesquisa Estado Sao Paulo.; Conselho Nacl Desenvolvimento Cient & Tecnologico.; Coordenadoria Aperfeicoamento Pessoal Nivel Super.; Universidad Sao Paulo, Pro Reitoria Pesquisa.; Centro Latino Americano Fis.; Int Ctr Theoret Phys.; Int Union Crystallog.; CGA Analit.