In-situ observation of the nitrogenation of Sm2Fe17 by means of high temperature x-ray diffraction |
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Authors: | Angelika Teresiak Bernhard Gebel Axel Handstein Norbert Mattern H Klose Karl-Hartmut Müller |
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Institution: | Institute of Solid State and Materials Research Dresden, Postfach 270016, D-01171 Dresden, Germany, DE
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Abstract: | The mechanism of nitrogenation of Sm2Fe17 was investigated with in-situ high temperature x-ray diffraction with Debye-Scherrer optic using a quartz capillary equipped with an additional buffer volume to supply sufficient nitrogen for the expected phase reaction. The formation of Sm2Fe17Nx with x ≈ 3 was observed at temperatures between 325?°C and 450?°C. During the phase transition period, taking 30–90 min at 450?°C and up to 300 min at 350?°C, two phases were observed simultaneously, a non-nitrided Sm2Fe17 phase and the already fully nitrided Sm2Fe17N3 phase. At 325?°C no single-phase material could be obtained during 300 min. The resulting lattice parameters measured after the complete nitrogenation are the same as those, obtained from the externally nitrogenized samples. |
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