Improved magnetic properties by treatment of iron-based rare earth intermetallic compounds in anmonia

Hydrogen storage capacity of carbon nanotubes, filaments, and vapor-grown fibers

A series of interstitial ternary nitrides R2Fe17Ny with 23<y<29 has been prepared for R=Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu and Y The nitrides have structures related to those of Th2Zn17 or Th2Ni17, but the unit cell volumes are 6-7% greater, and the magnetic ordering temperatures some 400 K higher than for the 2:17 parent compounds The Fe-Fe exchange interactions are more than doubled by nitrogenation, whereas the R-Fe exchange interactions are little changed All compounds exhibit easy-plane anisotropy at room temperature, except for Sm2Fe17Ny, which is easy-axis

https://iopscience.iop.org/article/10.1088/0953-8984/2/30/013/pdf

Magnetic properties of a new series of rare-earth iron nitrides: R2Fe17Ny(y approximately 2.6)

Gas-phase carbonation of R2Fe17; R=Y, Sm

The reaction between nitrogen gas and the series of R2Fe17 intermetallic compounds is studied by thermopiezic analysis on micron‐size powders. Nitrogen diffusion in the range 300–550 °C can be represented by an activated interstitial diffusion process D=D0e−Em/kT with D0=1.95×10−10 m2 s−1 and an activation energy Em=0.81 eV. This stage of the nitrogenation reaction leads to the formation of R2Fe17N3−δ nitrides which have structures related to those of the parent compounds. Heating above about 800 °C leads to complete disproportionation of the compounds into a mixture of rare‐earth nitride and iron.

Nitrogenation of R2Fe17 compounds: R=rare earth

An instrument for the quantitative study of gas-solid reactions is described. By focusing on pressure changes within a small volume, rather than mass variations as in thermogravimetry, greater sensitivity can be achieved.

Thermopiezic analysis: gas absorption and desorption studies on milligram samples

Magnetic properties of iron-rich Fe-Hf glasses

Influence of quench rate and hydrogen absorption on the magnetic properties of melt-spun Nd15Fe77B8

An automatic microcomputer-controlled thermomanometric analyser has been developed for studies of hydrogen in small metallic samples (1–50 mg). The operating temperature and heating rate are selectable in the ranges 50–1000 °C and 1–50 °C min -1 respectively. The pressure range is from vacuum to 2000 mbar and data are displayed as the temperature dependence P ( T ) of the gas pressure and its derivative d P ( T )d T . As examples of its use, data are presented on hydrogen in crystalline Nd 2 Fe 14 B and amorphoud Y-Fe, Zr-Fe and Gd-Ni alloys.

An automatic thermomanometer for hydrogen absorption and desorption studies on milligram samples

Etude de la derivee par rapport a la temperature de la resistivite vers le point de Curie des systemes reentrants NiMn 22% at. et FeZr-a 8% at. Resultats de susceptibilite magnetique pour le systeme NiMn. Deduction des exposants critiques

https://hal.archives-ouvertes.fr/jpa-00228725/document

RESISTIVITY OF THE REENTRANT SYSTEMS NiMn AND a-FeZr NEAR THE FERROMAGNETIC PHASE TRANSITION

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