Nitrogen atom location in rhombohedral and hexagonal RE<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> compounds
R M Ibberson; O Moze; T H Jacobs; K H J Buschow; R M Ibberson; ISIS Sci. Div., Rutherford Appleton Lab., Didcot, UK; O Moze; ISIS Sci. Div., Rutherford Appleton Lab., Didcot, UK; T H Jacobs; ISIS Sci. Div., Rutherford Appleton Lab., Didcot, UK; K H J Buschow; ISIS Sci. Div., Rutherford Appleton Lab., Didcot, UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1991-03-11
Аннотация:
High resolution neutron powder diffraction studies were performed on Nd<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> and Y<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub>. A strong preferential site occupation of the N atoms on the 9e position of the rhombohedral compound Nd<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> was observed. In the hexagonal compound Y<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub> the N atoms occupy primarily the 6h sites (82%) and only a small fraction goes into the 12i site (12%). The refined nitrogen occupation numbers correspond to the formula compositions Nd<sub>2</sub>Fe<sub>17</sub>N<sub>2.6</sub> and Y<sub>2</sub>Fe<sub>17</sub>N<sub>2.9</sub>.
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