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- W2022897259 abstract "Abstract Compounds with the nominal composition near Sm2Fe17 were prepared by mechanical alloying starting from the elemental powders and subsequent annealing at temperatures, TA, between 600°C and 900°C. For crystal structure investigations of the non-equilibrium phases formed at various temperatures, XRD methods with following Rietveld analysis were applied. For TA between 600°C and 750°C a modified TbCu7-type structure of space group P6/mmm was found, in which the Fe(2c) site is replaced by the partially (1/3) and randomly occupied Fe(6l) site. Its approximate composition is SmFe8.8–9.0. For TA between 800°C to 900°C a disordered modified Th2Zn17 structure (space group R 3 m) was found that is formed by introducing additional randomly occupied Fe (6c) and Sm(3a) positions, respectively. The degree of order of Sm atoms and Fe-dumbbells along the c-direction increases with increasing TA. A decrease in the Fe concentration in the cell is observed for increasing TA. The completely ordered stoichiometric Th2Zn17-type structure could not be reached by annealing samples prepared from the ball-milled elemental powders." @default.
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- W2022897259 date "1998-06-01" @default.
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- W2022897259 title "Formation of modified TbCu7 and Th2Zn17 type structures during annealing of mechanical-alloyed Sm–Fe powders" @default.
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- W2022897259 doi "https://doi.org/10.1016/s0925-8388(98)00571-4" @default.
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