Synthesis of NH3 on Fe, Sm and Sm2Fe17 surfaces

Microstructure and magnetic properties of Sm2Fe17Nx compound and their magnets prepared by field-activated combustion

“…Hence the present applications of the Sm 2 Fe 17 N x compounds are limited to be bonded magnets. But due to the additional polymer [5,6] or metal [7,8], the magnetic properties of Sm 2 Fe 17 N x magnets will reduce. In order to obtain high performance Sm 2 Fe 17 N x magnets, recently some researchers had reported sintering Sm 2 Fe 17 N x magnets made by special approach such as spark plasma sintering (SPS) [9] and explosive sintering [10].…”

Hydrogen absorption kinetics and mechanisms of rare earths (La, Ce, Pr, Nd, Tb, Dy) in the H2O surface reaction at room temperature

“…Careful approach using a clean surface technique should be made in the investigation of the surface property. We have applied the Wagener method [7,8] using ultra high vacuum condition to evaluate the quantitative reactivity of a gas (H 2 , O 2 , N 2 , H 2 O) on the surface of a metal as a function of the amount of reacted gas for many metals such as transition metals (Ti, Ta, W, Fe [9,10], Co, Ni [11]), RE metals (La, Ce, Tb, Dy [12][13][14][15][16][17]), and RE-based alloys (LaNi 5 [11,[18][19][20], Sm 2 Fe 17 [21]). …”

Nitrogen Absorption by Sm2Fe17

“…On the other hand, no NH 3 formation was detected when the sample with H 2 pre-adsorption exposed to N 2 . 54 The fact that DH 134 kJ mol H2 1 for H 2 dissociative chemisorption on Fe is negatively much higher than DH 60 kJ mol N 2 1 for the N 2 chemisorption on Fe 54 suggests the NH 3 can be synthesised only by the reaction of chemisorbed N on Fe with dissosiative H from H 2 gas phases.…”