کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1330869 | 978981 | 2010 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Non-stoichiometric FexWN2: Leaching of Fe from layer-structured FeWN2 Non-stoichiometric FexWN2: Leaching of Fe from layer-structured FeWN2](/preview/png/1330869.png)
Non-stoichiometric FexWN2 (x∼0.72) was synthesized via leaching of Fe from layer-structured stoichiometric FeWN2 by soaking in sulfuric acid at ca. 50 °C. The synthesized products were characterized by powder X-ray diffraction (pXRD), secondary electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and magnetic measurements. Non-stoichiometric FexWN2 has the same symmetry unit cell as stoichiometric FeWN2 (P63/mmc), but the lattice parameters change: the a-axis expands by 0.16% while the c-axis decreases by 1.5%. Polycrystalline powder of FexWN2 showed similar morphologies as those of FeWN2. The calculated electronic structure of stoichiometric FeWN2 shows a more ionic-bonding character between Fe and N than that between W and N, which presumably allows for the partial Fe leaching from between the W–N prismatic layers. The magnetic susceptibility of FexWN2 smoothly decreases with increasing temperature from 3 to 300 K, unlike the broad maximum seen near 27 K in stoichiometric FeWN2.
Non-stoichiometric FexWN2 (x∼0.72) was synthesized via leaching of Fe from layer-structured stoichiometric FeWN2 by soaking in sulfuric acid at ca. 50 °C.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 183, Issue 2, February 2010, Pages 327–331